Final Rule Regulatory Guide 1.84

	U.S. NUCLEAR REGULATORY COMMISSION	August 2017
	OFFICE OF NUCLEAR REGULATORY RESEARCH			Revision 37
	REGULATORY GUIDE		Technical Lead Giovanni Facco

REGULATORY GUIDE 1.84

(Draft was issued as DG-1295, dated March 2016)

DESIGN, FABRICATION, AND MATERIALS CODE CASE

ACCEPTABILITY, ASME SECTION III

Purpose

This regulatory guide (RG) lists the American Society of Mechanical Engineers (ASME) Section III Code Cases that the U.S. Nuclear Regulatory Commission (NRC) has approved for use as voluntary alternatives to the mandatory ASME Boiler and Pressure Vessel (BPV) Code provisions that are incorporated by reference into Title 10, Part 50, of the Code of Federal Regulations (10 CFR Part 50), “Domestic Licensing of Production and Utilization Facilities” (Ref. 1).

Applicability

This RG applies to reactor licensees subject to 10 CFR Part 50, Section 50.55a, “Codes and Standards.”

Applicable Rules and Regulations

• General Design Criterion (GDC) 1, “Quality Standards and Records,” of Appendix A, “General Design Criteria for Nuclear Power Plants,” to 10 CFR Part 50 requires, in part, that structures, systems, and components important to safety be designed, fabricated, erected, and tested to quality standards commensurate with the importance of the safety function to be performed. Where generally recognized codes and standards are used, Criterion 1 requires that they be identified and evaluated to determine their applicability, adequacy, and sufficiency and be supplemented or modified as necessary to ensure a quality product in keeping with the required safety function.

• Criterion 30, “Quality of Reactor Coolant Pressure Boundary,” of Appendix A to 10 CFR Part 50 requires, in part, that components that are part of the reactor coolant pressure boundary be designed, fabricated, erected, and tested to the highest practical quality standards.

• Appendix B, “Quality Assurance Criteria for Nuclear Power Plants and Fuel Processing Plants,” to 10 CFR Part 50 requires, in part, that measures be established for the control of special processing of materials and that proper testing be performed.

• The regulation in 10 CFR 50.55a(c), “Reactor Coolant Pressure Boundary,” requires, in part, that components of the reactor coolant pressure boundary must be designed, fabricated, erected, and tested in accordance with the requirements for Class 1 components of Section III, “Rules for Construction of Nuclear Power Plant Components” (Ref. 2), of the ASME BPV Code or equivalent quality standards.

Related Guidance

• Regulatory Guide 1.147, “Inservice Inspection Code Case Acceptability, ASME Section XI, Division 1” (Ref. 3), lists the ASME Section XI Code Cases that the NRC has approved for use as voluntary alternatives to the mandatory ASME BPV Code provisions that are incorporated into 10 CFR 50.55a.

• Regulatory Guide 1.192, “Operation and Maintenance Code Case Acceptability, ASME OM Code” (Ref. 4), lists the ASME Operation and Maintenance Code (OM Code) Code Cases that the NRC has approved for use as voluntary alternatives to the mandatory ASME OM Code provisions that are incorporated into 10 CFR 50.55a.

• Regulatory Guide 1.193, “ASME Code Cases Not Approved for Use” (Ref. 5), lists the ASME Section III and Section XI Code Cases that the NRC has not approved for generic use.

Purpose of This Regulatory Guide

The NRC will amend 10 CFR 50.55a to incorporate by reference the new Code Cases and revisions to existing Code Cases listed as approved in Tables 1 and 2 of this guide, and to state the requirements governing the use of Code Cases. Code Cases approved by the NRC may be used voluntarily by licensees as an alternative to compliance with ASME Code provisions that have been incorporated by reference into 10 CFR 50.55a. Because of continuing change in the status of Code Cases, the staff plans periodic updates to 10 CFR 50.55a and this guide to accommodate new Code Cases and any revisions of existing Code Cases.

Paperwork Reduction Act

This RG contains and references information collections covered by 10 CFR Part 50 that are subject to the Paperwork Reduction Act of 1995 (44 U.S.C. 3501 et seq.). These information collections were approved by the Office of Management and Budget (OMB), control number 3150‑0011.

Public Protection Notification

The NRC may not conduct or sponsor, and a person is not required to respond to, a request for information or an information collection requirement unless the requesting document displays a currently valid OMB control number.

B. DISCUSSION

Reason for Revision

This revision (Revision 37) of RG 1.84 includes new information reviewed by the NRC of Section III Code Cases listed in Supplement 11 to the 2007 Edition and Supplements 0 through 10 to the 2010 Edition. This is an update to RG 1.84, Revision 36, which included information from Supplements 1 through 10 to the 2007 Edition.

Background

Provisions of the ASME BPV Code have been used since 1971 as one part of the framework to establish the necessary design, fabrication, construction, testing, and performance requirements for structures, systems, and components important to safety. Among other things, ASME standards committees develop improved methods for the construction and inservice inspection (ISI) of ASME Class 1, 2, 3, MC (metal containment), and CC (concrete containment) nuclear power plant components. A broad spectrum of stakeholders participates in the ASME process, which helps to ensure that the various interests are considered.

The ASME publishes a new edition of the BPV Code, which includes Section III, every 2 years. The latest edition of Section III that the NRC has approved for use are referenced in 10 CFR 50.55a(a)(1)(i). The ASME also publishes Code Cases quarterly. Code Cases provide alternatives developed and approved by ASME. This regulatory guide identifies the Code Cases that have been determined by the NRC to be acceptable alternatives to applicable parts of Section III. Section III Code Cases not yet endorsed by the NRC may be used by a licensee or applicant through 10 CFR 50.55a(z). That section permits the use of alternatives to the Code requirements referenced in 10 CFR 50.55a provided that the proposed alternatives result in an acceptable level of quality and safety, and that their use is authorized by the Director of the Office of Nuclear Reactor Regulation, or Office of New Reactors, as applicable.

The ASME Code is incorporated by reference into 10 CFR 50.55a. Code Cases approved by the NRC provide an acceptable voluntary alternative to the mandatory ASME Code provisions. Requirements related to Code Case implementation are provided in 10 CFR 50.55a(b). When a licensee initially applies a Code Case listed in Tables 1 or 2 of this guide, the licensee must implement the most recent version of that Code Case incorporated by reference in 10 CFR 50.55a.

Code Cases may be annulled because the provisions have been incorporated into the Code, the application for which it was specifically developed no longer exists, or experience has shown that the design analysis or construction method is no longer required. After the ASME annuls a Code Case and the NRC amends 10 CFR 50.55a and this guide, applicants or licensees may not implement that Code Case for the first time. However, a licensee or an applicant who implemented the Code Case prior to annulment may continue to use that Code Case until the licensee voluntarily updates its Section III Code of record. If a Code Case is incorporated by reference into 10 CFR 50.55a and later annulled by the ASME because experience has shown that the design analysis or construction method is no longer required, the NRC will amend 10 CFR 50.55a and this guide to remove the approval of the annulled Code Case. Licensees or applicants should not begin to implement such annulled Code Cases in advance of the rulemaking. Notwithstanding these requirements, the Commission may impose new or revised Code requirements, including implementation schedules, which it determines are consistent with the Backfit Rule (10 CFR 50.109).

A Code Case may be revised, for example, to incorporate user experience. The older or superseded version of the Code Case cannot be applied by the licensee or applicant for the first time. If an applicant or a licensee applied a Code Case listed in Tables 1 or 2 of this guide before it was listed as superseded, the applicant or the licensee may continue to use the Code Case until the applicant or the licensee updates its construction Code of Record (in the case of an applicant, updates its application). If a Code Case is incorporated by reference into 10 CFR Part 50.55a and later a revised version is issued by the ASME because experience has shown that the design analysis, construction method, examination method, or testing method is inadequate; the NRC will amend 10 CFR Part 50.55a and the relevant RG to remove the approval of the superseded Code Case. Applicants and licensees should not begin to implement such superseded Code Cases in advance of the rulemaking.

With regard to the use of any Code Case, it is the responsibility of the user to make certain that the provisions of the Code Case do not conflict with licensee commitments or regulatory requirements.

C. STAFF REGULATORY GUIDANCE

For Revision 37 of Regulatory Guide 1.84, the NRC reviewed the Section III Code Cases listed in Supplement 11 to the 2007 Edition and Supplements 0 through 10 to the 2010 Edition of the ASME BPV Code⁰. Appendix A to this guide lists the supplements reviewed, the edition, the supplement number, and the date on which the supplement was approved by the ASME Board on Nuclear Codes and Standards. Appendix B is a list of the Section III Code Cases published by the ASME in the eleven supplements. Finally, Appendix C is a current list of all Section III Code Cases. The Code Cases addressed by this regulatory guide are listed in five tables:

1. Table 1, “Acceptable Section III Code Cases,” contains the Code Cases that are acceptable to the NRC for application in the design and construction of light-water-cooled nuclear power plants.

2. Table 2, “Conditionally Acceptable Section III Code Cases,” contains Code Cases that are acceptable provided that they are used with the identified conditions (i.e., the Code Case is generally acceptable but the NRC has determined that requirements in the Code Case, which are alternatives to the BPV Code, must be supplemented in order to provide an acceptable level of quality and safety).

3. Table 3, “Annulled Unconditionally Approved Section III Code Cases,” contains the Code Cases that have been annulled by the ASME.

4. Table 4, “Annulled Conditionally Acceptable Section III Code Cases,” contains the Code Cases that the NRC determined to be acceptable, provided that they were used with the identified conditions, but were subsequently annulled by the ASME.

5. Table 5, “Section III Code Cases That Have Been Superseded by Revised Code Cases on or After July 1, 1974,” lists Code Cases that have been superseded through revision.

1. Acceptable Code Cases

The Code Cases listed in Table 1 below are acceptable to the NRC for application in the design and construction of components and their supports for water-cooled nuclear power plants. Code Cases are published quarterly in supplements to each edition. For Code Cases previously listed in this guide, the third column of Table 1 lists the date of ASME approval. For new or revised Code Cases, the third column of Table 1 lists the supplement and edition in which each Code Case was published (e.g., “5/10E” means Code Case Supplement 5 to the 2010 Edition).

Table 1. Acceptable Section III Code Cases

Code Case Number	Table 1 Acceptable Section III Code Cases	Date or Supplement/ Edition
N-4-13	Special Type 403 Modified Forgings or Bars, Section III, Division 1, Class 1 and CS	2/12/08
N-131-1 (1759-1)	Material for Internal Pressure Retaining Items for Pressure Relief Valves, Section III, Division 1, Class 1, 2, and 3	2/03/03
N-133-3	Use of SB-148 Alloys 952 and 954, Section III, Division 1, Class 3	2/03/03
N-154-1	Projection Resistance Welding of Valve Seats, Section III, Division 1, Classes 1, 2, and 3	2/03/03
N-171	Postweld Heat Treatment of P-No. 1 Material, Section III, Division 2	4/30/93
N-192-3	Use of Braided Flexible Connectors, Section III, Division 1, Class 2 and 3	7/23/02
N-205	Use of Ductile Iron SA-395, Section III, Division 1, Class 3	2/25/02
N-213	Welded Radial Shear Bar Assemblies, Section III, Division 2	2/25/02
N-284-3	Metal Containment Shell Buckling Design Methods, Class MC, TC, and SC Construction, Section III, Divisions 1 and 3 Note: Code Case N-284-2 was unconditionally approved in Revision 36 of RG 1.84.	7/10E
N-315	Repair of Bellows, Section III, Division 1	2/03/03
N-319-3	Alternate Procedure for Evaluation of Stresses in Butt Welding Elbows in Class 1 Piping, Section III, Division 1	2/03/03
N-351	Use of Subsize Charpy V-Notch Specimens, Section III, Division 1	1/17/00
N-369	Resistance Welding of Bellows, Section III, Division 1	5/09/03
N-373-3	Alternative PWHT Time at Temperature for P-No. 5A or P-No. 5B Group 1 Material, Classes 1, 2, and 3	10/08/04
N-405-1	Socket Welds, Section III, Division 1	2/20/04
N-438-1	UNS N08367, Section III, Division 1, Class 2 and 3 Construction	5/24/96
N-452	Specialized Subcontracted Welding Process (Electron Beam Welding), Section III, Division 1	5/09/03
N-453-3	Nickel-Chromium-Molybdenum-Copper Stainless Steel (UNS N08925) for Class 2 and 3 Construction, Section III, Division 1	8/14/01
N-454-1	Nickel-Chromium-Molybdenum-Copper Stainless Steels (UNS N08925 and N08926) Wrought Fittings for Class 2 and 3 Construction, Section III, Division 1	6/17/03
N-455-1	Nickel-Chromium-Molybdenum-Copper Stainless Steels (UNS N08925 and N08926) Forged Flanges and Fittings for Class 2 and 3, Section III, Division 1	6/17/03
N-469-1	Martensitic Stainless Steel for Class 1, 2, and 3 Components, Section III, Division 1	2/03/03
N-493	Alternative Radiographic Acceptance Criteria for Vessels Used as Shipping Casks, Section III, Division 1, Class 1	7/23/02
N-500-4	Alternative Rules for Standard Supports for Classes 1, 2, 3 and MC, Section III, Division 1 Note 1: Code Case N-500-2 was unconditionally approved in Revision 36 of RG 1.84. Note 2: Code Case N-500-3 was published in Supplement 11 to the 2007 Edition. Thus, the latest version (i.e., N-500-4) is listed in the table.	8/10E
N-505	Alternative Rules for the Examination of Butt Welds Used as Closure Welds for Electrical Penetration Assemblies in Containment Structures, Section III, Division 1	5/04/04
N-511	Design Temperature for Atmospheric and 0-15 psi Storage Tanks, Section III, Division 1	5/04/04
N-520-5	Alternative Rules for Renewal of Active or Expired N-type Certificates for Plants Not in Active Construction, Section III, Division 1 Note: Code Case N-520-2 was conditionally approved in Revision 36 of RG 1.84.	10/10E
N-525	Design Stress Intensities and Yield Strength Values for UNS N06690 With a Minimum Specified Yield Strength of 30 ksi, Class 1 Components, Section III, Division 1	7/23/02
N-539	UNS N08367 in Class 2 and 3 Valves, Section III, Division 1	2/20/04
N-548	Air Cooling of SA-182 Grades F304, F304L, F316, F316L Forgings Instead of Liquid Quenching After Solution Heat Treatment, Class 1, 2, and 3, Section III, Division 1	9/07/01
N-558	Stamping of Class 2 Vessels Fabricated to Subsection NB, Section III, Division 1	2/25/02
N-564-2	UNS J93380, Alloy CD3MWCuN, Class 2 and 3 Construction, Section III, Division 1	2/03/03
N-570-2	Alternative Rules for Linear Piping and Linear Standard Supports for Classes 1, 2, 3, and MC, Section III, Division 1	9/09/08
N-579	Use of Nonstandard Nuts, Class 1, 2, and 3, MC, CS Components and Supports Construction, Section III, Division 1	2/03/03
N-580-2	Use of Alloy 600 With Columbium Added, Section III, Division 1	1/04/08
N-594-1	Repairs to P-4 and P-5A Castings Without Postweld Heat Treatment Class 1, 2, and 3 Construction, Section III, Division 1 Note: Code Case N-594 was unconditionally approved in Revision 36 of RG 1.84.	8/10E
N-607	Guidance on Implementation of NS Certificate of Accreditation, Section III, Division 1	5/04/04
N-610	Alternative Reference Stress Intensity Factor (K1R) Curve for Class Components, Section III, Division 1	5/04/04
N-611	Use of Stress Limits as an Alternate to Pressure Limits Subsection NC/ND-3500, Section III, Division 1	2/20/04
N-620	Rules for Class 1 Type M Pumps, Section III, Division 1	5/04/04
N-621-1	Ni-Cr-Mo Alloy (UNS N06022) Welded Construction to 800F, Section III, Division 1	10/08/04
N-625-1	Ni-Cr-Mo Alloy (UNS N06059) Welded Construction to 800F, Section III, Division 1	2/20/04
N-631	Use of Fracture Toughness Test Data to Establish Reference Temperature for Pressure Retaining Materials Other Than Bolting for Class 1 Vessels, Section III, Division 1	7/23/02
N-632	Use of ASTM A 572, Grades 50 and 65 for Structural Attachments to Class CC Containment Liners, Section III, Division 2	2/03/03
N-635-1	Use of 22Cr-5Ni-3Mo-N (Alloy UNS S31803) Forgings, Plate, Bar, Welded and Seamless Pipe, and/or Tube, Fittings, and Fusion Welded Pipe With Addition of Filler Metal, Classes 2 and 3, Section III, Division 1	2/14/03
N-636	Use of 18Cr-13Ni-3Mo (Alloy UNS S31703), 19Cr-15Ni-4Mo (Alloy UNS S31725), and 18.5Cr-15.5Ni-4.5Mo-N (Alloy UNS S31726) Forgings, Seamless Tubing, Plate, Welded Tubing, Welded and Seamless Pipe, Welded Pipe With Addition of Filler Metal and Fittings, Classes 2 and 3, Section III, Division 1	7/23/02
N-637-1	Use of 44Fe-25Ni-21Cr-Mo (Alloy UNS N08904) Plate, Bar, Fittings, Welded Pipe, and Welded Tube, Classes 2 and 3, Section III, Division 1 Note: Code Case N-637 was conditionally approved in Revision 35 of RG 1.84.	3/10E
N-642	Alternative Rules for Progressive Liquid Penetrant Examination of Groove Welds In P-No. 8 Materials 3/16 in. (5 mm) Thick and Less Made by Autogenous Machine or Automatic Welding, Section III, Division 1	2/03/03
N-644-1	Weld Procedure Qualification for Procedures Exempt From PWHT in Classes 1, 2, and 3 Construction, Section III, Division 1	3/28/01
N-646	Alternative Stress Intensification Factors for Circumferential Fillet Welded or Socket Welded Joints for Class 2 or 3 Piping, Section III, Division 1	2/20/04
N-650	Use of SA-537, Class 2 Plate Material in Non-pressure Boundary Application Service 700F to 850F, Class 1 or CS, Section III, Division 1	2/20/04
N-655-2	Use of SA-738, Grade B, for Metal Containment Vessels, Class MC, Section III, Division 1 Note: Code Case N-655-1 was unconditionally approved in Revision 36 of RG 1.84.	4/10E
N-657	Use of the N-1A Data Report for Spent Fuel Canisters, Section III, Division 1	2/25/02
N-692	Use of Standard Welding Procedures, Section III, Divisions 1 and 2	6/17/03
N-698	Design Stress Intensities and Yield Strength for UNS N06690 With a Minimum Specified Yield Strength of 35 ksi (240 Mpa), Class 1 Components, Section III, Division 1	11/18/03
N-699	Use of Titanium Grade 2 (UNS R50400) Tube and Bar, and Grade 1 (UNS R50250) Plate and Sheet for Class 1 Construction, Section III, Division 1	1/05/06
N-703	Use of Strain Hardened Austenitic Material at Lower Design Stress Values for Class 1 Valves, Section III, Division 1	5/04/04
N-708	Use of JIS G-4303, Grades SUS304, SUS304L, SUS316, and SUS316L, Section III, Division 1	9/21/07
N-710	Use of Zirconium Alloy UNS R60702, Bars, Forgings, Plate, Seamless and Welded Fittings, Seamless and Welding Tubing, and Seamless and Welded Pipe, for Class 3 Construction, Section III, Division 1	5/04/04
N-725	Design Stress Values for UNS N06690 With Minimum Specified Yield Strength of 35 ksi (240 Mpa), Classes 2 and 3 Components, Section III, Division 1	1/12/05
N-727	Dissimilar Welding Using Continuous Drive Friction Welding for Reactor Vessel CRDM/CEDM Nozzle to Flange/Adapter Welds, Classes 1, Section III, Division 1	2/24/06
N-736	Use UNS S32050 Welded and Seamless Pipe and Tubing, Forgings, and Plates Conforming to SA-249/SA-249M, SA-479/SA-479M, and SA-240/SA-240M, and Grade CK35MN Castings Conforming to ASTM A 743-03 for Construction of Class 1, 2, and 3 Components, Section III, Division 1	1/05/06
N-738	NDE of Full Penetration Butt Welds in Class 2 Supports, Section III, Division 1	7/01/05
N-741	Use of 22Cr-5Ni-3Mo-N (Alloy UNS S32205 Austenitic/ferritic Duplex Stainless Steel) Forging, Plate, Welded and Seamless Pipe Tubing, and Fittings to SA-240, SA-0789, A 790-04a, SA-815, Classes 2 and 3, Section III, Division 1	10/11/05
N-744	Use of Metric Units Boiler and Pressure Vessel Code, Section III, Divisions 1 and 3, and Section V and IX	10/11/05
N-746	Use of 46Fe-24Ni-21Cr-6Mo-Cu-N (UNS N08367) Bolting Materials for Class 2 and 3 Components, Section III, Division 1	1/05/06
N-756	Alternative Rules for Acceptability for Class 1 Valves, NPS (DN 25) and Smaller with Nonwelded End connections Other than flanges, Section III, Division 1	1/21/07
N-759-2	Alternative Rules for Determining Allowable External Pressure and Comprehensive Stress for Cylinders, Cones, Spheres, and Formed Heads, Section III, Division 1	1/04/08
N-760-2	Welding of Valve Plugs to Valve Stem Retainers, Classes 1, 2, and 3, Section III, Division 1	10/10/08
N-763	ASTM A 709-06, Grade HPS 70W (HPS 485W) Plate Material Without Postweld Heat Treatment as Containment Liner Material or Structural Attachments to the Containment Liner, Section III, Division 2	2/10E
N-767	Use of 21 Cr-6Ni-9Mn (Alloy UNS S21904) Grade GXM-11 (Conforming to SA‑182/SA-182M and SA-336/SA-336M), Grade TPXM-11 (Conforming to SA‑312/SA-312M) and Type XM-11 (Conforming to SA-666) Material, for Class 1 Construction, Section III, Division 1	1/04/08
N-774	Use of 13Cr-4Ni (Alloy UNS S41500) Grade F6NM Forgings Weighing in Excess of 10,000 lb (4 540 kg) and Otherwise conforming to the Requirements of SA-336/SA-336M for Class 1, 2, and 3 Construction, Section III, Division 1	9/03/08
N-777	Calibration of Cv Impact Test Machines, Section III, Divisions 1, 2, and 3	4/10E
N-782	Use of Editions, Addenda, and Cases, Section III, Division 1	1/30/09
N-785	Use of SA-479/SA-479M, UNS S41500 for Class 1 Welded Construction, Section III, Division 1	11/07E
N-801	Rules for Repair of N-Stamped Class 1, 2, and 3 Components by Organization Other Than the N Certificate Holder That Originally Stamped the Component Being Repaired, Section III, Division 1	12/23/10
N-802	Rules for Repair of Stamped Components by the N Certificate Holder That Originally Stamped the Component, Section III, Division 1	12/23/10
N-811	Alternative Qualification Requirements for Concrete Level III Inspection Personnel, Section III, Division 2	7/10E
N-815	Use of SA-358/SA-358M Grades Fabricated as Class 3 or Class 4 Welded Pipe, Class CS Core Support Construction, Section III, Division 1	8/10E
N-816	Use of Temper Bead Weld Repair Rules Adopted in 2010 Edition and Earlier Editions, Section III, Division 1	8/10E
N-817	Use of Die Forgings, SB-247, UNS A96061, Class T6, With Thickness ≤ 4.000 in. Material, Class 2 Construction (1992 Edition or Later) Section III, Division 1	8/10E
N-819	Use of Die Forgings, SB-247, UNS A96061, Class T6, With Thickness ≤ 4.000 in. Material, Class 2 Construction (1989 Edition with the 1991 Addenda or Earlier), Section III, Division 1	8/10E
N-822	Application of the ASME Certification Mark, Section III, Divisions 1, 2, 3, and 5	8/10E

2. Conditionally Acceptable Section III Code Cases

The Code Cases listed in Table 2 below are acceptable to the NRC for application in the design and construction of components and their supports for water-cooled nuclear power plants within the limitations indicated by the NRC. Unless otherwise stated, limitations indicated by the NRC are in addition to the conditions specified in the Code Case. Code Cases are published quarterly in supplements to each edition. For Code Cases previously listed in this guide, the third column of Table 1 lists the date of ASME approval. For new or revised Code Cases, the third column of Table 1 lists the supplement and edition in which each Code Case was published (e.g., “5/10E” means Code Case Supplement 5 to the 2010 Edition).

Table 2. Conditionally Acceptable Section III Code Cases

Code Case Number	Table 2 Conditionally Acceptable Section III Code Cases	Date or Supplement/ Edition
	Title/Condition
N-60-5	Material for Core Support Structures, Section III, Division , Class 1	2/20/04
	The maximum yield strength of strain-hardened austenitic stainless steel shall not exceed 90,000 psi in view of the susceptibility of this material to environmental cracking.
N-62-7	Internal and External Valve Items, Section III, Division 1, Classes 1, 2, and 3	2/03/03
	The Code requires that Class 1 and Class 2 valve manufacturers meet the provisions of NCA-4000, “Quality Assurance.” Class 3 valve manufacturers must also meet the provisions of NCA‑4000 because all Code Class valve items are subject to the licensee’s 10 CFR Part 50, Appendix B approved QA program.
N-71-18	Additional Materials for Subsection NF, Class 1, 2, 3, and MC Component Supports Fabricated by Welding, Section III, Division 1	5/09/03
	The maximum measured ultimate tensile strength (UTS) of the component support material must not exceed 170 Ksi in view of the susceptibility of high-strength materials to brittleness and stress corrosion cracking. Certain applications may exist where a UTS value of up to 190 Ksi could be considered acceptable for a material and, under this condition, the Design Specification must specify impact testing for the material. For these cases, it must be demonstrated by the applicant that: the impact test results for the material meet Code requirements, the impact test results for the material meet Code requirements, the material is not subject to stress corrosion cracking by virtue of the fact that: a corrosive environment is not present, and the component that contains the material has essentially no residual stresses or assembly stresses, and
N-71-18 (cont’d)	Additional Materials for Subsection NF, Class 1, 2, 3, and MC Component Supports Fabricated by Welding, Section III, Division 1	5/09/03
	it does not experience frequent sustained loads in service. In the last sentence of paragraph 5.3, reference must be made to paragraph 5.3.2.3, “Alternative Atmosphere Exposure Time Periods Established by Tests,” of the AWS D1.1 Code for the evidence presented to and accepted by the Authorized Inspector concerning exposure of electrodes for longer periods of time. Paragraph 15.2.2 is not acceptable as written and must be replaced with the following: “When not exempted by 15.2.1 above, the postweld heat treatment must be performed in accordance with NF‑4622 except that ASTM A-710 Grade A Material must be at least 1000°F (540°C) and must not exceed 1150°F (620°C) for Class 1 and Class 2 material and 1175°F (640°C) for Class 3 material. The new holding time at temperature for weld thickness (nominal) must be 30 minutes for 2 inch or less, 1 hour per inch for thickness over 2 inch to 5 inches, and for thicknesses over 5 inches, 5 hours plus 15 minutes for each additional inch over 5 inches. The fracture toughness requirements as listed in this Code Case apply only to piping supports and not to Class 1, Class 2, and Class 3 component supports.
N-155-2	Fiberglass Reinforced Thermosetting Resin Pipe, Section III, Division 1	2/03/03
	The design temperature for spray pond piping must be 100°C (212°F). The allowable design stress must be the value obtained from the minimum hydrostatic design basis (HDB) in Table 3611-1 of Code Case N-155-2 (Procedure A or B) or the value determined as one-sixth of the stress obtained from a short-time burst test for the pipe being qualified, whichever is lower. The short-time burst strength must be determined by bursting the pipe (ASTM D‑1599‑74) using free-end mounting after it has been exposed to 105 pressure cycles from atmospheric to design pressure. The value of “K” in equation 9 of paragraph 3652 must be limited to 1.2 unless it can be demonstrated that with the use of a large value of K1 the functional capability of the system will not be impaired during upset and emergency conditions. RTR piping must be uninsulated or uncovered and installed under conditions that make it readily accessible for inspection. Preoperational and inservice inspections must be as follows: During the preoperational testing period, tests must be made to verify that the piping is free of vibration induced by weather conditions or water flow that could fatigue the piping prematurely; Fiberglass-reinforced piping components must be inspected in accordance with ASME Code, Section XI, for Code Class 3 components. In addition, all pipe supports must be inspected; Inspection frequency for piping must be increased to once annually if an exterior weather-resistant coating is not provided.
N-249-14	Additional Materials for Subsection NF, Class 1, 2, 3, and MC Component Supports Fabricated Without Welding, Section III, Division 1	2/20/04
	The fracture toughness requirements apply only to piping supports and not to Class 1, Class 2, and Class 3 component supports. The following is to be added to paragraph (e) of the Code Case: (a) “For these cases, it must be demonstrated by the Owner that: (i) the impact test results for the material meet Code requirements, and (ii) the material is not subject to stress corrosion cracking by virtue of the fact that: a corrosive environment is not present; the component that contains the material has essentially no residual stresses or assembly stresses; and it does not experience frequent sustained loads in service.”
N-570-1	Alternative Rules for Linear Piping and Linear Standard Supports for Classes 1, 2, 3, and MC, Section III, Division 1	1/05/06
	The provisions of ANSI/AISC N690-1994 s2, “Supplement No. 2 to the Specification for the Design, Fabrication, and Erection of Steel of Safety-Related Structures for Nuclear Facilities,” must be met.
N-626	Use of Plastic Analysis for the Design of Type B Containment Components for Nuclear Material Transportation Casks, Section III, Division 3	7/23/02
	For the acceptability of a design by analysis, Paragraph WB‑3211, “Requirements for Acceptability,” of Section III, Division 3, Subsection WB, “Class TP (Type B) Containment,” Subparagraphs (a) through (d) must be applied. There is a typographical error in the title of Paragraph (a)(2) of the Code Case. Paragraph WB‑3277 does not exist. Paragraph WB‑3227, “Applications of Inelastic Analysis Procedures,” of Section III, Division 3, Subsection WB, “Class TP (Type B) Containment,” is to be used. The first paragraph of WB‑3324, “Design for Local Puncture Associated with a Hypothetical Accident Condition,” of Section III, Division 3, Subsection WB, “Class TP (Type B) Containment,” must be applied. The second paragraph of WB-3324 may be applied. In lieu of the third paragraph of WB-3324, the following may be applied: “In lieu of the application of the equation for outer shell thickness (treq) the response of the containment boundary to puncture test loadings may be evaluated using plastic analysis according to the rules in Appendix F, “Rules for Evaluation of Service Loadings with Level D Service Limits.”
N-757-1	Alternative Rules for Acceptability for Class 2 and 3 Valves (DN 25) and Smaller with Welded and Nonwelded End Connections Other than Flanges, Section III, Division 1	9/21/07
	The design provisions of ASME Section III, Division 1, Appendix XIII, shall not be used for Class 3 valves.

3. Annulled Unconditionally Approved Section III Code Cases

The Code Cases listed in Table 3 were previously unconditionally approved by the NRC and have been annulled by the ASME.

Table 3. Annulled Unconditionally Approved Section III Code Cases

Code Case Number	Table 3 Annulled Unconditionally Approved Section III Code Cases	Annulment Date
N-1-7 (1332-7)	Requirements for Steel Forgings, Section III, Division 1	7/01/82
N-2 (1334-3)	Requirements for Corrosion-Resisting Steel Bars and Shapes, Section III	1/01/82
N-3-10 (1335-10)	Requirements for Bolting Materials, Section III	9/16/84
N-5-1	Nickel Chromium Age Hardenable Alloys (Alloy X750), Section III, Division 1, Classes 1, 2, 3, MC, and CS	12/13/85
N-6 (1345-2)	Requirements for Nickel-Molybdenum-Chromium-Iron Alloys, Section III	3/01/79
N-7-1	High Yield Strength Steel, Class 1, Section II, Division 1	2/22/05
N-9-4 (1395-4)	SA-508, Class 2 Forgings with Modified Manganese Content, Section III	7/01/82
N-10 (1407-3)	Time of Examination for Classes, 1, 2, and 3, Section III Vessels	9/17/87
N-15 (1456-2)	Substitution of Ultrasonic Examination for Progressive Penetrant or Magnetic Particle Examination of Partial Penetration and Oblique Nozzle Attachment Welds, Section III	3/01/79
N-17 (1474-1)	Integrally Finned Tubes for Section III	1/21/91
N-20-4	SB-163, Cold Worked UNS N08800; and SB-163 UNS N06600, UNS N06690, and UNS N08800 to Supplementary Requirements S2 of SB-163, Section III, Division 1, Class 1	9/18/01
N-22 (1498-1)	SA-508-Class 2 and 3, Minimum Tempering Temperature, Section III	7/01/82
N-24 (1516-2)	Welding of Seats or Minor Internal Permanent Attachments in Valves for Section III Applications	1/01/80
N-30-1 (1539-1)	Metal Bellows and Metal Diaphragm Stem Sealed Valves, Section III, Division 1, Classes 1, 2, and 3	1/01/81
N-32-3 (1541-3)	Hydrostatic Testing of Embedded Class 2 and Class 3 Piping for Section III, Division 1 Construction	7/01/79
N-33 (1542-1)	Type 403 Forgings or Bars for Bolting Material, Section III	1/21/85
N-35-1 (1552-1)	Design by Analysis of Section III, Class 1 Valves	7/01/79
N-37-3 (1557-3)	Steel Products Refined by Secondary Remelting, Section III and VIII, Division 1 and 2	7/01/82
N-41 (1571)	Additional Material for SA-234 Carbon Steel Fittings, Section III	1/21/85
N-43 (1578)	SB-167 Nickel-Chromium-Iron (Alloy 600) Pipe or Tube, Section III	7/01/82
N-46 (1588)	Electro-Etching of Section III Code Symbols	3/19/82
N-48-2	Fabrication and Installation of Elevated Temperature Components, Section III, Division 1	7/01/96
N-49-4	Examination of Elevated Temperature Nuclear Components, Section III, Class 1	7/01/96
N-50-1	Testing of Elevated Temperature Components, Section III, Division 1, Class 1	7/01/96
N-51-2	Protection Against Overpressure of Elevated Temperature Components, Section III, Division 1, Class 1	7/01/96
N-55-1 (1609)	Inertia and Continuous Drive Friction Welding, Section III, Division 1	4/05/87
N-56 (1612)	Use of Type 308 Stainless Steel Rod and Bar for Section III, Class 1, 2, 3, and CS Construction	7/01/78
N-61 (1620)	Stress Category for Partial Penetration Welded Penetrations, Section III, Class Construction	1/08/82
N-65-1 (1626-1)	Normalized and Tempered 1-1/4 Cr Low Alloy Steel Forgings, Section I and III	1/21/85
N-66-1 (1630-1)	External Pressure Charts for High Yield Strength Carbon Steels and Low Alloy Steels (Yield Strength above 38 Ksi to 60 Ksi Inclusive) For Section III, Class 1, 2, 3, and MC	12/05/87
N-68 (1634-2)	Use of SB-359 for Section III, Division, 1, Class 3 Construction	7/01/78
N-77 (1660)	Overpressure Protection Under Emergency Operating Conditions for Section III, Class 1	7/01/77
N-81 (1665)	Pressure-Temperature Ratings for Class 1 Valves Made from 5 Cr‑1/2 Mo, Section III	7/01/78
N-82 (1677)	Clarification of Flange Design Loads, Section III, Class 1, 2, and 3	3/01/79
N-84 (1681-1)	Organizations Accepting Overall Responsibility for Section III Construction	3/01/79
N-90 (1692)	Rules for Design of Welded Class 1 Pumps	7/01/78
N-94 (1700)	Determination of Capacities of Liquid Relief Valves, Section III, Division 1, Class 1, 2, and 3	3/19/82
N-95-2 (1701-2)	Determination of Capacities of Vacuum Relief Valves, Section III, Division 1, Classes 2, 3, and MC and Division 2 Concrete Containments	7/09/82
N-96-1 (1702-1)	Flanged Valves Larger than 24 inches for Section III, Division 1, Class 1, 2, and 3 Construction	1/01/80
N-101 (1712)	Nameplates and Stamping for Section III, Division 1, Class 1, 2, 3 and MC Construction as Referenced in NA‑8300	3/01/79
N-102-2	Postweld Heat Treatment of P-1 Material, Section III, Class MC	6/30/84
N-107-1 (1722-1)	Vacuum, Carbon Deoxidized SA-508 Forgings, Section III, Division 1	1/08/82
N-108 (1724)	Deviation from the Specified Silicon Ranges in ASME Material Specifications, Section III, Division 1, and VIII, Division 1 and 2	7/01/78
N-109 (1726)	Refinement of Low Alloy Steel Heat Affected Zone Under Overlay Cladding, Section III, Division 1, Class 1 Components	3/01/79
N-111 (1729)	Minimum Edge Distance-Bolting for Section III, Division 1, Class 1, 2, and 3 and MC Construction of Component Supports	3/01/79
N-114 (1732)	Hardsurfaced Valves with Inlet Connections less than 2‑in. Nominal Pipe Size for Section III, Division 1, Class 1 and 2 Construction	1/01/79
N-115 (1733)	Evaluation of Safe Shut Down Earthquake Loadings for Section III, Division 1, Class MC Containment Vessels	1/01/78
N-119-6	Pump Internal Items, Section III, Division 1, Class 1, 2, and 3	3/14/94
N-121 (1744)	Carbon Steel Pipe Flanges Larger than 24 in., Section III, Division 1, Class 2 and 3 Construction	3/01/79
N-122-2	Procedure for Evaluation of the Design of Rectangular Cross Section Attachments on Class 1 Piping, Section III, Division 1	8/20/09
N-123 (1746)	Leak Testing of Seal Welds, Section III, Division 1, Class 1, 2, and 3 Construction	3/01/79
N-124 (1747)	Requirements for Martensitic Stainless Forgings with 13% Chromium and 4% Nickel, Section III, Division 1	7/13/87
N-125 (1748)	Low Carbon Austenitic Stainless Steel Pipe Welded With Filler Metal, Section III, Division 1, Construction	7/01/78
N-126 (1754)	Hard Surfacing by the Spray-Fuse Method, Section III, Class 1, 2, and 3 Construction	7/01/88
N-127 (1755-1)	Alternative Rules for Examination of Welds in Piping, Section III, Class 1 and 2 Construction	2/20/92
N-139	Testing of Electroslag Wire and Flux for Class 1, 2, 3, MC, and CS Construction, Section III, Division 1	1/01/79
N-140 (1772)	Use of SA-453 Bolts in Service Below 800F Without Stress Rupture Tests, Section III, Division 1	12/31/85
N-142-1 (1774-1)	Minimum Wall Thickness for Class 2 and 3 Valves, Section III, Division 1	1/01/80
N-147 (1781)	Use of Modified SA-487 Grade CA6NM, Section III, Division 1, Class 1, 2, 3, MC or CS	7/01/78
N-148 (1782)	Use of Copper-Nickel Alloy 962 for Castings, Section III, Division 1, Class 3 Construction	6/30/83
N-156 (1793)	Structural Steel Rolled Shapes, Section III, Division I, Class 2, 3, and MC	2/14/86
N-157 (1794)	Use of Seamless Al-Br, Alloy CDA 614 Pipe, Section III, Division 1, Class 3	1/07/83
N-158 (1795)	Examination of Weld Repairs in Forgings, Section III, Division 1, Class 1, 2, 3, MC and CS	7/01/78
N-159 (1796)	Body Neck Thickness Determination for Valves with Inlet Connections 4-Inch Nominal Pipe Size and Smaller, Section III, Division 1, Class 1, 2, and 3	7/01/78
N-160-1	Finned Tubing for Construction, Section III, Division 1	10/14/11
N-174 (1812)	Size of Fillet Welds for Socket Welding of Piping, Section III, Division 1	1/01/81
N-176-1 (1819-1)	Use of Type XM-19 for Construction, Section III, Division 1, Class 1, 2, and 3	8/25/83
N-177 (1820)	Alternative Ultrasonic Examination Technique, Section III, Division 1	1/01/84
N-178	Use of ASTM B271, CDA 954, Alloy 9C for Class 3 Construction, Section III, Division 1	1/01/80
N-179	Openings in Valves for Section III, Division 1, Class 1, 2 and 3 Construction	7/11/80
N-180	Examination of Springs for Class 1 Component Standards Supports, Section III, Division 1	7/01/78
N-181	Steel Castings Refined by the Argon Decarburization Process, Section III, Division 1, Construction	7/11/80
N-182	Alternate Rules for Procedure Qualification Base Material Orientation, Section III, Division 1, Class 2 and 3 Construction	7/01/81
N-183	Use of Modified SA-182 Grade F22 for Section III, Division 1, Class 1, 2 and 3 Construction	1/01/80
N-184	Roll Threading of SA-453 Bolting for Section III, Division 1, Class 1, 2, 3, or CS Construction	7/01/79
N-188-1	Use of Welded Ni-Fe-Cr-Mo-Cu (Alloy 825) and Ni-Cr-Mo-Cb (Alloy 625) Tubing, Section III, Division 1, Class 2 and 3	8/14/96
N-189	Primary Membrane Plus Primary Bending Stress Intensity Limits for Other Than Solid Rectangular Sections for Section III, Division 1, Class MC Construction	7/01/79
N-190	Use of SA-455 for Class 3 Components, Section III, Division 1	7/01/78
N-193	Use of SB-61 and SB-62 Bronze for Section III, Division 1, Class 3 Flange and Socket Weld End Valves	11/21/80
N-196-1	Exemption from the Shakedown Requirements When Plastic Analysis Is Performed for Section III, Division 1, Class 1 and CS Construction	7/01/92
N-204	Use of Modified SA-508, Class 3, and SA-541, Class 3 for Section III, Division 1, Class 1, 2, and 3 Components	1/01/81
N-206	Use of ASTM B151-75 Copper-Nickel Alloy 706 Rod and Bar for Section III, Division 1, Class 3 Construction	6/30/83
N-207-1	Use of Modified SA-479 Type XM-19 for Section III, Division 1, Class 1, 2, 3, or CS Construction	1/21/85
N-212 (1693)	Welding Procedure Qualification of Dissimilar Metal Welds When AButtering@ with Alloy Weld Metal and Heat Treatment May Be Involved, Section III, Division 1, and Section IX.	1/01/81
N-214-2	Use of SA-351 Grade CN7M, for Valves, Section III, Division 1	12/31/83
N-215	Integrally Finned Titanium Tubes, Section III, Division 1, Class 3 Construction	5/15/81
N-217-1	Postweld Heat Treatment of Weld Deposit Cladding on Classes 1, 2, 3, MC, and CS Items, Section III, Division 1	2/23/87
N-220	Code Effective Date for Component Supports, Section III, Division 1	7/13/81
N-223	Requirements for Stainless Steel Precipitation Hardening, Section III, Division 1, Class MC	11/20/81
N-224-1	Use of ASTM A500 Grade B and ASTM A501 Structural Tubing for Welded Attachments for Section III, Class 2, 3, and MC	4/05/90
N-225	Certification and Identification of Material for Component Supports, Section III, Division 1	1/01/81
N-226	Temporary Attachment of Thermocouples, Section III, Division 1, Class 1, 2 and 3 Component Supports	1/01/80
N-227	Examination of Repair Welds, Section III, Class 2 and 3 Tanks	7/09/82
N-228	Alternate Rules for Sequence of Completion of Code Data Report Forms and Stamping for Section III, Class 1, 2, 3 and MC Construction	3/19/82
N-229	Alternate Rules for Fabrication Welding SB-148 Alloy CDA 954 for Section III, Division 1, Class 3 Construction	1/21/88
N-231	Alternate Methods for Leak Detection in the Attachment Welds of Leak Chase Channels, Section III, Division 2, Class CC	7/01/92
N-233	Alternate Rules for PWHT of P-No. 6, Group 4 Material for Section III, Division 1, Class 3 Construction	9/17/87
N-237-2	Hydrostatic Testing of Internal Piping, Section III, Division 1, Classes 2 and 3	7/01/88
N-240	Hydrostatic Testing of Open Ended Piping, Section III, Division 1	7/01/97
N-241	Hydrostatic Testing of Piping, Section III, Division 1	7/01/97
N-243	Boundaries Within Castings Used for Core Support Structures, Section III, Division 1, Class CS	10/14/11
N-245	Use of ASTM B61-76 and B62-76 Copper Alloy Castings for Section III, Division 1, Class 3 Construction	7/17/85
N-246-2	SB-169 Alloy C61400, Section III, Division 1, Class 3 Construction	7/27/95
N-247	Certified Design Report Summary for Component Standard Supports, Section III, Division 1, Class 1, 2, 3 and MC	4/30/93
N-248	Alternative Reference Radiographs, Section III, Division 1, Classes 1, 2, 3, MC, and CS Construction	7/01/80
N-259	Ni-Cu-Al Bolting Material SB 164 Modified, Section III, Division 1, Class 3	1/01/84
N-261	Weld Procedure Qualification for Materials with Impact Requirements for Section III, Division 1, Class 3 Construction	12/13/82
N-262	Electric Resistance Spot Welding for Structural Use in Component Supports, Section III, Division 1	7/27/91
N-265-1	Modified SA-487 Castings, Section III, Division 1, Class 1	8/14/97
N-267	Double-Wall Radiography, Section III, Division 1, Class 1 and 2	7/01/81
N-271	Simplified Method for Analyzing Flat Face Flanges with Metal to Metal Contact Outside the Bolt Circle for Section III, Class 2, 3, and MC Construction	2/14/86
N-272	Compiling Data Report Forms, Section III, Division 1	1/01/82
N-276	Welding of SA-358 Pipe, Section III, Division 1	2/14/86
N-277	Use of Type XM-19 Austenitic Stainless Steel for Section III, Division 1 Class MC Construction	9/17/80
N-280	Alternate Rules for Examination of Welds in Section III, Class 3 Storage Tanks	7/01/81
N-281	Welding Operator Performance Qualification, Section III, Division 1	7/01/81
N-282	Nameplates for Valves, Section III, Division 1, Class 1, 2, and 3 Construction	7/30/89
N-294	SB-148 Alloys 952 and 954, and SB-62 Alloy 836 Fittings, Section III, Division 1, Class 2	7/27/95
N-295	NCA-1140, Materials, Section III, Division 1	6/30/82
N-296	Welding Material, Section III, Division 1 Construction	12/01/83
N-298	Examination of Component Supports, Section III, Division 1, Class 1, 2, 3, and MC	12/01/83
N-299-1	Use of Nickel-Chromium-Molybdenum-Columbium Alloy 625 Forgings, Section III, Division 1, Class 2 and Class 3 Components	2/23/87
N-300	Pressure-Temperature Ratings, Hydrostatic Tests, and Minimum Wall Thickness of Valves, Section III, Division 1, Class 1	12/01/83
N-302	Tack Welding, Section III, Division 1, Construction	11/28/83
N-304-4	Use of 20Cr-25Ni-6Mo (Alloy UNS N08366) Plate, Sheet, Strip, and Welded Pipe, Class 2 and 3, Section III, Division 1	1/01/03
N-309-1	Identification of Materials for Component Supports, Section III, Division 1	7/01/95
N-313	Alternative Rules for Half-Coupling Branch Connections, Section III, Division 1, Class 2	7/01/96
N-316	Alternative Rules for Fillet Weld Dimensions for Socket Welding Fittings, Section III, Division 1, Class 1, 2, and 3	8/14/93
N-317	ASTM A276 Bar, Section III, Division	7/01/82
N-318-5	Procedure for Evaluation of the Design of Rectangular Cross Section Attachments on Class 2 or 3 Piping, Section III, Division 1	8/20/09
N-320	Alternate PWHT for SA-487, Grade CA6NM, Section III, Division 1	12/31/83
N-321-1	Use of Modified SA-249, Grade TP 304, Section III, Division 1, Class 1	12/85/88
N-324	Qualification of Authorized Nuclear Inspector Supervisor (Concrete) and Authorized Nuclear Inspector (Concrete), Section III, Division 2, Classes CB and CC	7/27/95
N-328	Thermit Brazing or Welding of Nonstructural Attachments, Section III, Division 1	9/17/87
N-329	Examination of Bar Material, Section III, Division 1, Class 1	10/14/11
N-336	Examination of Welds Inaccessible During Pressure Test, Section III, Division 1, Class MC	6/30/83
N-337-1	Use of ASTM B 525-70 Grade II, Type II, Sintered Austenitic Stainless Steel for Classes 2, 3, and MC Component Standard Supports, Section III, Division 1	3/14/94
N-339	Examination of Ends of Fillet Welds, Section III, Division 1,Classes 1, 2, and MC	9/17/84
N-341	Certification of Level III NDE Examiner, Section III, Division 1 and 2	7/01/88
N-342	Use of SA-249 and SA-312 Type 317 Stainless Steel, Section III, Division 1, Classes 1, 2, and 3	4/02/85
N-345-1	Attachment of AMS 5382 Alloy 31 Seat Rings by Friction Welding, Section III, Division 1, Classes 1, 2, and 3	3/28/01
N-346	Explosive Welding, Section III, Division 1	6/30/86
N-347	Continuous Electric Resistance Seam Welding of P-No. 8 Materials for Component Supports, Section III, Division 1	12/13/85
N-349	Pressure Testing Piping Systems, Section III, Division 1, Classes 2 and 3	12/13/85
N-352-1	Use of SA-638 Grade 660 Forgings and Bars Below 700F Without Stress Rupture Tests, Section III, Division 1	6/30/86
N-353	Marking of SA-354 Grade BD Bolting, Section III, Division 1	9/05/88
N-354-1	Subcontracted Service, Section III, Division 2	8/14/94
N-355	Calibration Block for Angle Beam Ultrasonic Examination of Large Fittings in Accordance with Appendix III-3410	8/09/96
N-357	Certification of Material for Component Supports, Section III, Division 1, Subsection NF	7/01/88
N-359	Weld Connection for Coaxial Cylinders, Section III, Division 1, Class 1	12/31/84
N-362-2	Pressure Testing of Containment Items, Section III, Division 1,Classes 1, 2, and MC	7/01/88
N-367	SA-372 Type V, Grade 1, Class B, Section III, Division 1	2/19/89
N-368	Pressure Testing of Pump Discharge Piping, Section III, Division 1, Classes 2 and 3	7/01/95
N-370-2	Modified SA-705 Type XM-13 Forgings, Section III, Division 1	8/14/97
N-371-1	12Cr-1W-1Mo-1/4V Martensitic Stainless Steel Valve Internals, Section III, Division 1	7/18/88
N-372	SB-163 Ni-Fe-Cr-Mo-Cu Alloy 825 (UNS N08825) Tubing, Section III, Division 1	12/31/83
N-376	Pressure Testing of Embedded Class 2 and 3 Piping, Section III, Division 1	7/30/86
N-377	Effective Throat Thickness of Partial Penetration Groove Welds, Section III, Division 1, Classes 1, 2, and 3	12/31/83
N-378	Examination of Piping Support Material, Section III, Division 1, Class 1	10/28/86
N-379-1	Bimetallic Tubing, Section III, Division 1, Class 1	7/18/91
N-384-1	Use of Prepackaged General Purpose Cement Grouts, Epoxy Grouts, and Epoxy Bonding, Section III, Division 2, Class CC	7/27/91
N-387	Certification of Level III NDE Examiner, Section III, Division 2	9/18/01
N-388	Component Support Bolting, Section III, Division 1, Classes 2, 3, and MC	2/23/87
N-391-2	Procedure for Evaluation of the Design of Hollow Circular Cross Section Welded Attachments on Class 1 Piping, Section III, Division 1	5/04/04
N-392-3	Procedure for Evaluation of the Design of Hollow Circular Cross Section Welded Attachments on Classes 2 and 3 Piping, Section III, Division 1	5/04/04
N-393	Repair Welding Structural Steel Bolted Shapes and Plates for Component Supports, Section III, Division 1	7/27/95
N-394	Restricting Lift to Achieve Reduced Relieving Capacities of Full Lift, Nozzle Type, and Flat Seated Safety and Safety Relief Valves for Compressible Fluid Applications, Section III, Division 1, Classes 2 and 3	3/02/01
N-395	Laser Welding, Section III, Division 1	9/18/01
N-403	Reassembly of Subsection NF Component and Piping Supports, Section III, Division 1	7/01/95
N-410	Certified Relieving Capacities of Pressure Relief Valves Having Set Pressure of 3 psig up to but Not including 15 psig Installed for Overpressure Protection of Compressible Fluid Systems, Section III, Division 1, Classes 2 and 3	3/14/00
N-412	Alternative Rules for Witnessing the Piping System Pressure Tests of Classes 1, 2, and 3 Piping Systems, Section III, Division 1	4/15/91
N-413	Minimum Size of Fillet Welds for Subsection NF Linear Type Supports, Section III, Division 1	2/14/88
N-414	Tack Welds for Class 1, 2, 3 and MC Components and Piping Supports	2/20/92
N-418-1	Use of Seamless Ni-Fe-Cr-Mo-Cu Low Carbon (UNS N08028 and UNS N08904) Tubing, Section III, Division 1, Classes 2 and 3	7/27/95
N-420	Linear Energy Absorbing Supports for Subsection NF, Classes 1, 2, and 3 Construction	1/01/99
N-421	Brazing Using a Radiant Energy Source, Section III, Division 1	6/30/86
N-433	Non-Threaded Fasteners for Section III, Division 1, Class 1, 2, and 3 Components and Piping Supports	12/16/95
N-438-4	UNS N08367 Material, Section III, Division 1, Class 2 and 3 Construction	7/01/98
N-439-1	Use of 20Cr-18Ni-6Mo (Alloy UNS S31254) Forgings, Plate, Seamless and Welded Pipe, and Welded Tube, Class 2 and 3 Construction, Section III, Division 1	9/18/01
N-440-1	Use of 20Cr-18Ni-6Mo (Alloy UNS J93254) Castings, Class 2 and 3 Construction, Section III, Division 1	9/18/01
N-441-2	Use of 20Cr-18Ni-6Mo (Alloy UNS S31254) Fittings, Class 2 and 3 Construction, Section III, Division 1	9/18/01
N-442	1977 Addendum to ANSI/ASME PTC 25.3-1976, Safety and Safety Relief Valves, Class 1, 2, 3, and MC, Section III, Division 1	3/08/92
N-443-2	High Yield Strength Cr-Mo Steel, Class 1 Components, Section III, Division 1	1/01/01
N-451	Alternative Rules for Analysis of Piping Under Seismic Loading, Class 1, Section III, Division 1	8/14/96
N-459	SA-508 Basic Oxygen-Ladle Furnace Process for Code Construction, Section III, Division 1	3/14/94
N-462	Alternative Rules for Analysis of Piping Products Under Seismic Loading, Class 2 and 3 Piping Systems, Section III, Division 1	5/24/96
N-464	Laser Welding of Lap Joints, Section III, Division 1, Classes 2 and 3 Construction	5/09/03
N-466-1	Modified 9Cr-1Mo Material, Section III, Division 1, Classes 1, 2, and 3	8/14/97
N-468	Alternative Method of Earthquake Description for Class 2 and 3 Piping of Low Seismicity Sites, Section III, Division 1	1/01/92
N-470	Class MC Material Requirements [NE-2121(c)], Section III, Division 1	3/08/92
N-474-2	Design Stress Intensities and Yield Strength Values for UNS N06690 With a Minimum Specified Yield Strength of 35 ksi, Class 1 Components, Section III, Division 1	1/01/00
N-475	Materials in Inventory, Section III, Division 1	12/11/92
N-476	Class 1, 2, 3, and MC Linear Component Supports - Design Criteria for Single Angle Members, Section III, Division 1, Subsection NF	7/01/96
N-482	Direct Quenched Stainless Bar, ASTM A 479-88b, Section III, Division 1	3/05/93
N-484-1	Real Time Radioscopic Examination of Welds, Section III, Division 1	12/16/94
N-492-1	Grade 9 Titanium Alloy Tubing, Section III, Division 1, Class 1, 2, and 3	1/01/00
N-497-1	Use of Fe-Ni-Cr-Mo-N (C-N-3MN) Cast Materials, Section III, Division 1, Class 2 and 3 Construction	1/01/99
N-501	Alternative Rules for NCA-3800, 1990 Addenda, Section III, Division 1	12/31/93
N-502	SA-268, Grade 26-3-3 (UNS S44660), Section III, Classes 2 and 3	1/01/00
N-507	Identification of Welders, Section III, Division 2	7/27/05
N-519	Use of 6061-T6 and 60610T651 Aluminum for Class 1 Nuclear Components, Section III, Division 1	2/03/02
N-540	Guidance on Implementation of NCA-3800 Revisions in 1994 Addenda, Section III, Division 1	6/30/98
N-549	Stamping and Flow Certification of Rupture Disk Devices, Classes 2 and 3, Section III, Division 1	3/19/99
N-550	Alternative Rules for Examination of Welds in Instrument Tubing, Classes 1 and 2, Section III, Division 1	5/20/01
N-551	Alternative Methods of Analysis, NC/ND-3673.1, Class 2 and 3 Applications, Section III, Division 1	8/14/97
N-559	SA-203, Grade E (Plate) and SA-350, Grade LF3 (Forging), 3.5% Ni Nominal Composition Used in Class 1 Construction, Section III, Division 1	5/24/99
N-570	Alternative Rules for Linear Piping and Linear Standard Supports for Class 1, 2, 3, and MC, Section III, Division 1	3/28/06
N-572	Use of SG-425 (UNS N08825) Bar and Rods for Class 1 Construction, Section III, Division 1	5/24/99
N-596	Use of Alternative Reference Specimens, Section III, Division 1	2/20/04
N-608	Applicable Code Edition and Addenda, NCA‑1140(a)(2), Section III, Division 1	5/20/01
N-656	Rules for the Construction of Inner Transportation Containments, Section III, Division 3	5/11/10
N-732	Magnetic Particles Examination of forgings for Construction, Section III, Division 1	10/14/11
1141-7	Foreign Produced Steel	7/23/76
1434-1	Postweld Heat Treatment of SA-487 Class 8N Steel Castings, Section III	1/01/78
1461-1	Electron Beam Welding, Section I, III, and VIII, Division 1 and 2	2/16/77
1470-2	External Pressure Charts for High-Strength Carbon Steels and for Low-Alloy Steels, Section VIII, Division 1 and 2, and Section III	11/04/74
1471-1	Vacuum Electron Beam Welding of Tube Sheet Joints, Section III	1/01/78
1475-1	Ferritic-Austenitic Stainless Steel Seamless Tubes for Section III, Class 2 and 3 Construction	7/01/75
1477-1	Use of 1970 Addenda of ANSI B31.7, Section III	1/01/78
1494-1	Weld Procedure Qualification Test, Section III	1/01/78
1506	Stress Intensification Factors, Section III, Class 2 and 3 Piping	1/01/78
1515	Ultrasonic Examination of Ring Forgings for Shell Sections, Section III, Class 1 Vessels	7/01/77
1529	Materials for Instrument Line Fittings, Section III	7/01/73
1531	Electrical Penetrations, Special Alloys for Electrical Penetration Seals, Section III	3/21/77
1532	Section III, Class 3 Components Made of 8 Percent and 9 Percent Nickel Steel	1/01/78
1533	Pressure Temperature Ratings of SA-351 Grades CF8A, CF3, and CF3M, Section III	7/01/75
1535-2	Hydrostatic Testing of Section III, Class 1 Valves	3/21/77
1536	Closing Seam for Electrical Penetrations for Section III, Class 2, 3, and MC	7/01/77
1553-1	Upset Heading and Roll Threading of SA-453 for Bolting in Section III	1/01/76
1555-1	Certification of Safety Relief Valves, Section III, Division 1	1/01/78
1567	Testing Lots of Carbon and Low Alloy Steel Covered Electrodes, Section III	1/01/78
1568	Testing Lots of Flux Cored and Fabricated Carbon and Low Alloy Steel Welded Electrodes, Section III	1/01/78
1573	Vacuum Relief Valves, Section III	1/01/78
1574	Hydrostatic Test Pressure for Safety Relief Valves, Section III	12/31/74
1580-1	Buttwelded Alignment Tolerance and Acceptable Slopes for Concentric Centerlines for Section III, Class 1, 2, and 3 Construction	1/01/78
1581	Power-Operated Pressure Relief Valves, Section III	3/01/79
1583	Use of 80-40 Carbon Steel Castings, Section III	3/21/77
1587	SA-508 Class 3 Forgings with 0.4/1.0 Ni for Section III and VIII, Division 2 Construction	12/31/75
1590	Chemical Analysis Variations, Section III Construction	3/21/77
1601	Limits of Reinforcement for Two-Thirds Area, Section III, Class 1	7/01/74
1602-1	Use of SB-42 Alloy 122, SB-111 Alloys 122, 715 and 706 and SB-466 Alloys 706 and 715, Section III, Class 2 and 3 Components	12/31/74
1603	Toughness Tests When Cross-Section Limits Orientation and Location of Specimens	7/01/74
1605	Cr-Ni-Mo-V Bolting Material for Section III, Class 1 Components	3/17/80
1608-1	Use of ASME SB-265, SB-337, SB-338, and SB-381, Grades 1, 2, 3, and 7 Unalloyed Titanium and ASTM B‑363 Titanium Welding Fittings, Section III, Class 2 and 3 Components	3/21/77
1613	Use of SA-372 Class IV Forgings, Section III Construction	1/01/78
1614	Hydrostatic Testing of Piping Prior To or Following the Installation of Spray Nozzles for Section III, Classes 1, 2, and 3 Piping Systems	1/01/79
1615	Use of A587-73, Section III, Class 3 Construction	1/01/78
1616	Ultrasonic Examination of Seamless Austenitic Steel Pipe, Section III, Class 1 Construction	7/01/75
1622	PWHT of Repair Welds in Carbon Steel Castings, Section III, Class 1, 2, and 3	1/01/76
1623	Design by Analysis for Section III, Class 1 Sleeve-Coupled and Other Patented Piping Joints	3/01/79
1625	Repair of Section III Class 2 and 3 Tanks	12/31/74
1633	Brazing of Seats to Class 1, 2, and 3 Valve Body or Bonnets, Section III	1/01/78
1637	Effective Date for Compliance with NA-3700 of Section III	1/01/75
1645	Use of DeLong Diagram for Calculating the Delta Ferrite Content of Welds in Section III, Class 1, 2, and CS Construction	1/01/76
1648	SA-537 Plates for Section III, Class 1, 2, 3, and MC Components	7/01/76
1649	Modified SA-453-GR 660 for Class 1, 2, 3, and CS Construction	1/01/76
1650	Use of SA-414 Grade C for Class 2 and 3 Components, Section III, Division 1	12/31/74
1651	Interim Requirements for Certification of Component Supports, Section III, Subsection NF	3/01/79
1657	Stress Criteria for Class 2 and 3 Atmospheric and Low Pressure (0-15 psig) Steel Storage Tanks	7/01/77
1659	Interconnection of Two Piping Systems for Section III, Class 1, 2, and 3 Construction	7/01/77
1661	Postweld Heat Treatment P-No.1 Materials for Section III, Class 1 Vessels	1/01/78
1662	Shop Assembly of Components, Appurtenances and Piping Subassemblies for Section III, Class 1, 2, 3, and MC Construction	1/01/78
1664	Use of Cr-Ni-Fe-Mo-Cu-Cb Stabilized Alloy Cb-3 for Section III Class 2 and 3 Construction	3/21/77
1666	Use of SB-12, Alloy 122 for Class 2 and 3 Construction	7/01/75
1672	Nuclear Valves for Section III, Division 1, Class 1, 2, 3 Construction	3/21/77
1675	Tubesheet to Shell or Formed Head Weld Joints, Section III, Class 1 Vessels	7/01/76
1676	Clarification of Stress Intensities in Curved Pipe or Welded Elbows, Section III	7/01/76
1678	Butterfly Valves of Circular Cross Section Larger than 24 in. NPS for Section III, Class 2 and 3 Construction	1/01/80
1682-1	Alternate Rules for Material Manufacturers and Suppliers, Section III, Subarticle NA-3700	12/31/75
1683-1	Bolt Holes for Section III, Class 1, 2, 3 and MC Component Supports	7/01/76
1684	A637 Grade 718 for Bolting Class 1 and 2 Construction	1/01/76
1685	Furnace Brazing Section III, Class 1, 2, 3 and MC Construction	1/01/78
1686	Furnace Brazing, Section III, Subsection NF, Component Supports	1/01/78
1690	Stock Materials for Section III Construction, Section III, Division 1	1/01/77
1691	Ultrasonic Examination in Lieu of Radiography of Repair Welds for Vessels, Section III, Class 1	1/01/78
1703	Brazing of Copper Alloys, Section III, Class 2	1/01/78
1706	Data Report Forms for Component Supports, Section III, Class 1, 2 and 3	12/31/75
1713	Small Material Items, Section III, Division 1, Class 1, 2, 3, CS and MC	12/31/75
1718	Design of Structural Connections for Linear Type Component Supports, Section III, Division 1, Class 1, 2 and 3 and MC	7/01/76
1719	Single-Welded, Full-Penetration Sidewall Butt Joints in Atmospheric Storage Tanks, Section III, Division 1, Class 2	7/01/76
1728	Steel Structural Shapes and Small Material Products for Components Supports, Section II, Division 1 Construction	7/01/77
1740	Weld Metal Test, Section III, Class 1, 2, 3, MC and CS	7/01/76
1741-1	Interim Rules for the Required Number of Impact Tests for Rolled Shapes, Section III, Division 1, Subsection NF, Components Supports	1/01/78
1742	Use of SB-75 Annealed Copper Alloy 122, Section III, Division 1, Class 2 Construction	7/01/76
1743	Use of SB-98 Cu-SiB Rod CDA651 Section III, Division 1, Class 2 Components	7/01/76
1760	Maximum Dimensions for Isolated Pores in WeldsBClass 1 Components, Section III, Division 1	7/01/77
1765	Machining After Hydrostatic Testing Class 2 and 3 Construction, Section III, Division 1	7/01/77
1766	Testing Requirements for Welding Materials, Class 1, 2, 3, MC and CS Construction, Section III, Division 1	7/01/77
1767	Examination of Tubular Products Without Filler Metal-Class 1 Construction, Section III, Division 1	1/01/77
1768	Permanent Attachments to Containment VesselsBClass MC, Section III, Division 1	1/01/78
1769-1	Qualification of NDE Level III Personnel, Section III, Division 1	10/01/77
1773	Use of Other Product Forms of Materials for Valves, Section III, Division 1	7/01/77
1775	Data Report Forms for Core Support Structures, Class CS, Section III, Division 1	8/13/79
1777	Use of SA-106, Grade C in Class MC Construction, Section III, Division 1	7/01/77
1787	Depth of Weld Repairs for Forgings, Section III, Division 1, Class 1, 2, 3, MC and CS Construction	1/01/78
1798	Use of ASTM A352-75, Grades LCA and LCC, Section III, Division 1, Class 1, 2, and 3	1/01/78
1808	F-Number Classification of Low Alloy and Carbon Steel Bare Rod Electrodes, Sections I, II, III, IV, V, VIII, and IX.	1/01/78
1810	Testing Lots of Carbon Steel Solid, Bare Welding Electrode or Wire, Section III, Division 1, Class 1, 2, 3, MC, and CS	3/03/80
1819	Use of Type XM-19 for Construction, Section III, Division 1, Class 1, 2, 3	1/01/78

4. Annulled Conditionally Acceptable Section III Code Cases

The Code Cases listed in Table 4 were conditionally approved by the NRC but were subsequently annulled by the ASME.

Table 4. Annulled Conditionally Acceptable

Section III Code Cases

Code Case Number	Table 4 Annulled Conditionally Acceptable Section III Code Cases	Annulment Date
	Title/Condition
N-11-5 (1414-5)	High Yield Strength Cr-Mo Steel for Section III, Division 1, Class 1 Vessels	8/29/80
	The information required to be developed by Note 1 in the Code Case should be provided in each referencing safety analysis report.
N-31-1	Elastomer Diaphragm Valves, Section III, Division 1, Classes 2 and 3	7/01/93
	Each applicant who applies the Code Case should indicate in the referencing safety analysis report that the service life of the elastomer diaphragm should not exceed the manufacturer’s recommended service life. This recommended service life should not exceed 1/3 of the minimum cycle life as established by the requirements of paragraph 3 of the Code Case. In addition, the service life of the elastomer diaphragm should not exceed 5 years, and the combined service and storage life of the elastomer diaphragm should not exceed 10 years.
N-32-4	Hydrostatic Testing of Embedded Class 2 and Class 3 Piping for Section III, Division 1 Construction	3/16/84
	The acceptance of Code Case N-32-4 was based on the following clarification and interpretation. Code Case N‑32‑4 does not replace paragraph NC/ND-6129, “Provisions for Embedded or Inaccessible Welded Joints in Piping,” of the Code. The intent of the Code Case is to (1) provide additional testing above Code requirements and (2) permit liquid penetrant or magnetic particle testing in place of radiographic testing for Class 3 piping with 3/8" nominal wall thickness or less. Paragraph (1) contains an additional requirement to the Code. It was, therefore, acceptable but unnecessary to include in the Code Case. Paragraph (2) is a variation in the volumetric examination technique and was acceptable as written. Paragraph (3) contains an additional requirement and is not a relaxation of the Code. It was, therefore, acceptable but unnecessary to include in the Code Case.
N-92 (1698)	Waiver of Ultrasonic Transfer Method, Section III, V, and VIII, Division 1	7/13/81
	The material from which the basic calibration block is fabricated should be of the same product form, alloy, and heat treatment as the material being examined. Alloys of equivalent P-number grouping may be used for the fabrication of calibration blocks if adjustments to signal height can be made to compensate for sound beam attenuation difference between the calibration block and the material under examination by following the transfer method procedure of T‑535.1(d), Article 5, Section V, ASME BPV Code, 1977 Edition.
N-100 (1711)	Pressure Relief Valve Design Rules, Section III, Division 1, Class 1, 2 and 3	1/01/83
	The following information should be provided in the safety analysis report: (1) If stress limits are used in excess of those specified for the upset operating condition, it should be demonstrated how the pressure relief function is ensured. Refer to paragraph 3.1, Section I, of the Code Case for Class and paragraph 3.2, Section II, of the Code Case for Class 2 and 3 pressure relief valves. (2) If Code Case 1660 is to be used in conjunction with the Code Case, it should be stated that the stress limits of Code Case 1660 supersede those of paragraph 3.2(b), Section I, of Code Case 1711. Functional assurance of (1) above is required in all situations.
N-106-2 (1720-2)	Weld End Preparation for Section III, Division 1 Construction	8/14/93
	The acceptance of weld end preparations other than those shown in Figures 1, 2, and 3 of the Code Case should be evaluated on a case-by-case basis.
N-110 (1727)	Alternate Test Fluids, Section III, Division 1	1/01/79
	The applicant should provide justification in the referencing safety analysis report for the fluid selected for use in the pressure test. The information provided should demonstrate that the fluid selected will not have deleterious effects on the material of the pressure boundary and that the fluid may be safely used at the specified temperature and pressure of the test. When the fluid selected for use is the operating fluid, additional information is not required.
N-116 (1734)	Weld Design for Use for Section III, Division 1, Class 1, 2, 3 and MC Construction of Component Supports	1/01/78
	If the configuration of Figure 1 of the Code Case is used for Class 1 and MC components supports, full penetration welds should be used. The application of the configuration shown in Figures 2 and 3 should be restricted to the welding of cans for spring encapsulation in spring hangers. In Figure 3, the length of the leg of the fillet weld adjacent to the plate should be equal to the thickness of the exposed edge of the plate; also, the leg of the fillet weld adjacent to the shell should be equal to the thickness of the exposed end of the shell.
N-146-1 (1780-1)	Hydrostatic Testing and Stamping of Components, Section III, Division 1, Construction	1/01/82
	On a generic basis, the application of the Code Case is limited to pumps and valves. Application to other components should be treated on a case-by-case basis. Each licensing application in which the Code Case is to be used should contain information showing that, as a minimum the closure fixture will impose loads that result in stresses equal to or greater than those induced during the hydrostatic test of a complete pump assembly. A closure fixture for the part being tested that is similar in size and shape to the actual mating part is considered adequate to impose these loads. It is not intended that piping reaction loadings be simulated in the hydrostatic testing.
N-175 (1818)	Welded Joints in Component Standard Supports, Section III, Division 1	7/01/79
	That portion of the unwelded housing that is limited to 90° maximum should include a minimum of two sectors that are uniform in length.
N-199	Intervening Elements, Section III, Division 1, Classes 1, 2, 3 and MC Component Construction	1/01/81
	The applicants should provide information in the referencing safety analysis report that demonstrates that all intervening elements have been designed in compliance with the requirements of the respective design specification.
N-208-2	Fatigue Analysis for Precipitation Hardening Nickel Alloy Bolting Material to Specification SB-637 N07718 for Class 1 Construction, Section III, Division 1	10/14/11
	(1) In Figure A, the words “No mean stress” shall be implemented with the understanding that it denotes “Maximum mean stress.” (2) In Figure A, σy shall be implemented with the understanding that it denotes σmax.
N-238	High Temperature Furnace Brazing of Seat Rings in Valve Bodies or Bonnets for Section III, Division 1, Class 1, 2, and 3 Valves	1/01/82
	The furnace brazing process procedure qualification should include a verification for nonsensitization as given in ASTM A 262-70, “Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels” (Ref. 7), Practices A or E, or ASTM A 708-74, “Practice for Detection of Susceptibility to Intergranular Corrosion in Severely Sensitized Austenitic Stainless Steels” (Ref. 8), whenever materials subject to sensitization are to be brazed. Documentation is required that a nonsensitizing brazing procedure was employed for valves produced to this Case.
N-242-1	Materials Certification, Section III, Division 1, Classes 1, 2, 3, MC, and CS Construction	6/30/84
	Applicants should identify in their safety analysis reports the components and supports for which the Code Case is being applied and should specify the respective paragraphs of the Code Case.
N-252	Low Energy Capacitive Discharge Welding Method for Temporary or Permanent Attachments to Components and Supports, Section III, Division 1, and XI	7/01/82
	The applicant should indicate in the safety analysis report the application, the material, and the material thickness to which the strain gage or thermocouple will be attached by CD welding.
N-260-2	Weld Repair of SA-182 Type 316 Forgings, Section III, Division 1, Classes 1, 2, 3, and MC	12/05/88
	Type 308L welding materials should not be used to repair grade F 316 N forgings because of the difference in strength levels.
N-263	Alternate Thread Forms, Series and Fits for Component Supports, Section III, Division 1	3/17/83
	The following information should be provided in the safety analysis report: (1) a description of the application, (2) a need for the use of the Code Case, and (3) a demonstration that support design will withstand maximum conditions of loading with the worst combination of thread tolerance.
N-274	Alternative Rules for Examination of Weld Repairs for Section III, Division 1 Construction	6/30/86
	The ultrasonic examination procedures shall be proven by actual demonstration, to the satisfaction of the Authorized Nuclear Inspector, that the procedures are capable of detecting unacceptable cracks according to Section XI requirements.
N-275	Repair of Welds, Section III, Division 1	12/31/83
	Use of the Code Case is applicable only when the removal of an indication requires that the full weld thickness be removed and, in addition, the backside of the weld assembly joint is not accessible for the removal of examination material. If an indication is removed and weld-metal layers still remain, it is not acceptable to gouge through the wall in order to qualify for use of the Code Case. Instead, examination of the cavity is required when such an indication has been removed.
N-279	Use of Torquing as a Locking Device for Section III, Division 1, Class 1, 2, 3, and MC Component Supports	7/13/81
	When torquing or other preloading is used as a locking device and the joint is later unloaded or disassembled, the bolting should be replaced unless it can be demonstrated or proved to the Authorized Nuclear Inspector that the original bolting has not been permanently strained.
N-292	Depositing Weld Metal Prior to Preparing Ends for Welding, Section III, Division 1, Class 1, 2, and 3	2/20/04
	Class 3 piping that is longitudinally welded and that has a weld efficiency factor of 1.0 as selected from Table ND‑3613.4-1, “Weld Joint Efficiency Factor,” must receive a 100 percent volumetric examination (RT or UT) of the deposited weld metal in accordance with the requirements of ND-5000, “Examination.”
N-310-1	Certification of Bolting Materials, Section III, Division 1, Class 1, 2, 3, MC and CS	7/01/82
	Each applicant who applies the Code Case should indicate in the referencing port safety analysis report: (1) in what way the bolting does not meet NCA-3800 (or NA‑3700), (2) where the bolting will be used in the plant, and (3) how it will be shown that the bolting material properties required by the equipment support design specification are present in the actual bolting material.
N-314	Alternate Rules for Thread Engagement, Section III, Division 1	5/11/84
	Applicants should identify in their safety analysis report: (1) the minimum length of thread engagement and (2) the procedure used to establish thread engagement.
N-348 N-348-1 N-348-2	Use of SA-574 Socket Weld Head Cap Screws, Section III, Division 1	9/7/85 2/20/89 8/14/93
	Applicants should justify in their safety analysis reports why use of these socket head cap screws will not result in early failure from stress corrosion cracking.
N-350	Postweld Heat TreatmentBThickness of Material, Section III, Division 1	9/05/85
	Applicants wishing to use this Code Case for other than P-1 materials should demonstrate that the use of this Code Case will not adversely affect the required material properties.
N-383-1	Weld Repair of SA-182 Austenitic Forgings, Section III, Division 1, Classes 1, 2, and 3	9/5/85
	Applicants who apply the provisions of this Code Case to permit material manufacturers to weld repair austenitic forgings without resolution heat treatment should provide justification to the NRC staff (via the safety analysis report) why this is acceptable for their applications, including their evaluation of the susceptibility for stress corrosion cracking.
N-397	Alternative Rules to the Spectral Broadening Procedures of N-1226.3 for Classes 1, 2, and 3 Piping, Section III, Division 1	2/20/87
	The Code Case is acceptable for specific plant applications on a case-by-case basis pending revision of Regulatory Guide 1.122, “Development of Floor Design Response Spectra for Seismic Design of Floor-Supported Equipment or Components” (Ref. 9).
N-398	Reporting of Charpy-V Notch Test Results, Section III, Division 1	2/20/87
	The Code Case is not acceptable to steam generator or reactor coolant pump supports. Applicants wishing to use this Code Case should indicate in the safety analysis report the component supports to which the case is applied for review on a case-by-case basis.
N-404	Annealed Alloy UNS N06625 Over UNS N06600 Bimetallic Tubing, Section III, Division 1, Class 1	12/11/95
	The outside layer of the bimetallic tubing should be limited to a minimum of 5 percent and to a maximum of 40 percent of the wall thickness. The tolerance on the outside layer of material should not exceed -0.000 to +0.007 inches of the specified design wall thickness.
N-411-1	Alternative Damping Values for Response Spectra Analysis of Class 1, 2, and 3 Piping, Section III, Division 1	5/05/00
	(1) The Code Case damping should be used completely and consistently, if used at all. [For equipment other than piping, the damping values specified in Regulatory Guide 1.61, “Damping Values for Seismic Design of Nuclear Power Plants” (Ref. 10), are to be used.] (2) The damping values specified may be used only in those analyses in which current seismic spectra and procedures have been employed. Such use is to be limited only to response spectral analyses [similar to that used in the study supporting its acceptance, NUREG/CR-3526, “Impact of Changes in Damping and Spectrum Peak Broadening on the Seismic Response of Piping Systems” (Ref. 11)]. The acceptance of the use with other types of dynamic analyses (e.g., time-history analyses or independent support motion method) is pending further justification.
N-411-1 (cont’d)	Alternative Damping Values for Response Spectra Analysis of Class 1, 2, and 3 Piping, Section III, Division 1	5/05/00
	(3) When used for reconciliation work or for support optimization of existing designs, the effects of increased motion on existing clearances and on-line mounted equipment should be checked. (4) This Code Case is not appropriate for analyzing the dynamic response of piping systems using supports designed to dissipate energy by yielding (i.e., the design of which is covered by Code Case N-420). (5) This Code Case is not applicable to piping in which stress corrosion cracking has occurred unless a case-specific evaluation is made and is reviewed by the NRC staff. (5) This Code Case is not applicable to piping in which stress corrosion cracking has occurred unless a case-specific evaluation is made and is reviewed by the NRC staff.
N-430	Alternative Requirements for Welding Workmanship and Visual Acceptance Criteria for Class 1, 2, 3 and MC Linear-Type and Standard Supports, Section III, Division 1	7/01/93
	(1) The applicant should demonstrate that the applicable supports are not subject to cyclic loading in excess of 20,000 cycles; and (2) The first sentence of 3.0(f)(1) should be replaced with the following: “For material 3/8 in. and less nominal thickness, undercut depth of 1/32 in. on one side of the member for the full length of the weld, or 1/32 in. on one side for one-half the length of the weld, and 1/16 in. for one-fourth of the length of the weld on the face of a rectangular tube or one-fourth the length of the weld on the same side of the member is acceptable.”
N-595-4	Requirements for Spent Fuel Storage Canisters, Section III, Division 1	10/14/11
	The canisters must be made from austenitic stainless steel Type 304 or 316.
N-656	Rules for the Construction of Inner Transportation Containments, Section III, Division 3	5/11/10
	The inner transportation containment must contain only solid and dry material.
1361-2	Socket Welds, Section III	3/01/79
	Code Case 1361-2 was acceptable when used in connection with Section III, paragraph NB-3356, Fillet Welds.
1412-4	Modified High Yield Strength Steel for Section III, Division 1, Class 1 Vessels	1/01/77
	The information required to be developed by Note 1 in the Code Case should be provided in each referencing safety analysis report. The material given in the Inquiry section of the Code Case should be SA-508, Class 4b, instead of SA‑508, Class 4.
1423-2	Wrought Type 304 and 316 with Nitrogen Added, Sections I, III, VIII, Division 1 and 2	7/01/77
	Code Case 1423-2 was acceptable subject to compliance with the recommendations contained in Regulatory Guide 1.31, “Control of Ferrite Content in Stainless Steel Weld Metal” (Ref. 12), and Regulatory Guide 1.44, “Control of the Use of Sensitized Stainless Steel” (Ref. 13).
1521-1	Use of H-Grades of SA-240, SA-479, SA-336, and SA-358, Section III	1/01/78
	Code Case 1521-1 was acceptable subject to compliance with the recommendations contained in Regulatory Guide 1.31, and Regulatory Guide 1.44.
1528-3	High Strength Steel SA-508, Class 2 and SA-541, Class 2 Forgings, Section III, Class 1 Components	1/01/78
	The information required to be developed by Note 1 in the Code Case should be provided in each referencing safety analysis report.
1569	Design of Piping for Pressure Relief Valve Station, Section III	7/01/79
	Code Case 1569 was acceptable subject to compliance with the recommendations contained in Regulatory Guide 1.67, “Installation of Over-Pressure Protection Devices” (Ref. 14).
1606-1	Stress Criteria Section III, Classes 2 and 3 Piping Subject to Upset, Emergency, and Faulted Operating Conditions	7/01/77
	Code Case 1606-1 was acceptable subject to the interpretation that the stress limit designations of “Upset,” “Emergency,” and “Faulted” do not necessarily imply agreement with specified plant conditions applicable to ASME Code Class 2 and 3 components for fluid systems. These designations should be established and justified in the design specifications.
1607-1	Stress Criteria for Section III, Classes 2 and 3 Vessels Designed to NC/NC‑3300 Excluding the NC-3200 Alternate	7/01/77
	Code Case 1607-1 was acceptable subject to the interpretation that the stress limit designations of “Upset,” “Emergency,” and “Faulted” do not necessarily imply agreement with specified plant conditions applicable to ASME Code Class 2 and 3 components for fluid systems. These designations should be established and justified in the design specifications.
1635-1	Stress Criteria for Section III, Class 2 and 3 Valves Subjected to Upset, Emergency, and Faulted Operating Conditions	7/01/77
	Code Case 1635-1 was acceptable subject to the interpretation that the stress limit designations of “Upset,” “Emergency,” and “Faulted” do not necessarily imply agreement with specified plant conditions applicable to ASME Code Class 2 and 3 components for fluid systems. These designations should be established and justified in the design specifications.
1636-1	Stress Criteria for Section III, Class 2 and 3 Pumps Subjected to Upset, Emergency, and Faulted Operating Conditions	7/01/77
	Code Case 1636-1 was acceptable subject to the interpretation that the stress limit designations of “Upset,” “Emergency,” and “Faulted” do not necessarily imply agreement with specified plant conditions applicable to ASME Code Class 2 and 3 components for fluid systems. These designations should be established and justified in the design specifications.
1689-1	Alternate PWHT Time and Temperature for SA-182 Grade F‑22, SA-387 Grade 22, Class 2, and SA-335 Grade P-22 Section III, Class 1, 2, 3 and CS	1/01/78
	The alternate postweld heat treatment should be prequalified along with the applicable welding procedure in accordance with ASME Section IX.
1783-1	Qualification of Nondestructive Examination Personnel, Section III, Division 1	1/01/79
	The first sentence of paragraph (1) should be replaced with the following: “The certification of the Level III nondestructive examination personnel for the purpose of this Section of the Code will be the responsibility of the employer of the Level III individual. If the employer is not a Certificate Holder, then the verification of such certificate is the responsibility of the Certificate Holder.”

5. Code Cases Superseded by Revised Code Cases

The Code Cases listed in Table 5 were approved in prior versions of this guide and have since been superseded by revised Code Cases (on or after July 1, 1974). The date in Column 3 indicates the date on which the ASME approved the revision to the Code Case. The older or superseded version of the Code Case, if listed in Table 5, cannot be applied by the licensee or applicant for the first time Note: Code Cases listed without conditions were unconditionally approved for use by the NRC.

Table 5. Section III Code Cases That Have Been

Superseded by Revised Code Cases on or after July 1, 1974

Code Case Number	Table 5 Code Cases That Have Been Superseded by Revised Code Cases on or After July 1, 1974	Revision Date
N-4-11 (1337-11) N-4-12	Special Type 403 Modified Forgings or Bars, Section III, Division 1, Class 1 and CS	1/12/05 2/12/08
N-5 (1344-5)	Nickel-Chromium, Age-Hardenable Alloys (Alloy X750), Section III	12/13/82
N-7 (1358-5)	High Yield Strength Steel, Section III, Division 1, Class 1 Vessels	12/13/82
	The information required to be developed by Note 1 in the Code Case should be provided in each referencing safety analysis report.
N-20 (1484-3) N-20-1	SB-163 Nickel-Chromium-Iron Tubing (Alloy 600 and 690) at Nickel-Iron-Chromium Alloy 800 at a Specified Minimum Yield Strength of 40.0 Ksi, Section III, Division 1, Class 1	9/05/85 12/07/87
N-20-2 N-20-3	SB-163 Nickel-Chromium-Iron Tubing (Alloy 600 and 690) at Nickel-Iron-Chromium Alloy 800 at a Specified Minimum Yield Strength of 40.0 Ksi and Cold Worked Alloy 800 at a yield strength of 47.0 Ksi, Section III, Division 1, Class 1	11/30/88 2/26/99
N-31 (1540-2)	Elastomer Diaphragm Valves, Section III, Class 2 and 3	7/18/85
	Each applicant who applies the Code Case should indicate in the referencing safety analysis report that the service life of the elastomer diaphragm should not exceed the manufacturer’s recommended service life. This recommended service life should not exceed 1/3 of the minimum cycle life as established by the requirements of paragraph 3 of the Code Case. In addition, the service life of the elastomer diaphragm should not exceed 5 years, and the combined service and storage life of the elastomer diaphragm should not exceed 10 years.
N-55 (1609-1)	Inertia and Continuous Drive Friction Welding, Section I, III, IV, VIII, Division 1 and 2, and IX	4/05/84
N-60 (1618-2) N-60-1	Material for Core Support Structures, Section III, Division 1, Subsection NG	5/25/83 9/17/84
	Welding of age-hardenable alloy SA-453 Grade 660 and SA‑637 Grade 688 should be performed when the material is in the solution-treated condition.
N-60-2 N-60-3 N-60-4	Material for Core Support Structures, Section III, Division 1, Subsection NG	9/05/85 5/13/91 2/15/94
	Welding of age-hardenable alloy SA-453 Grade 660 and SA‑637 Grade 688 should be performed when the material is in the solution-treated condition. For SA-479 material, the maximum yield strength should not exceed 90,000 psi in view of the susceptibility of this material to environmental cracking.
N-62-2 (1621-2) N-62-3 N-62-4 N-62-5 N-62-6	Internal and External Valve Items, Section III, Division 1, Class 1, 2 and 3 Line Valves	7/18/85 9/05/85 7/24/89 12/11/89 5/11/94
	The Code requires that Class 1 and Class 2 valve manufacturers meet the provisions of NCA 4000, “Quality Assurance,” and, in addition, Class 3 valve manufacturers should also meet the provisions of NCA‑4000.
N-71-7 (1644-7) N-71-8 (1644-8)	Additional Materials for Component Supports, Section III, Division 1, Subsection NF, Class 1, 2, 3 and MC Component Supports	5/15/78 1/07/80
	The maximum measured ultimate tensile strength (UTS) of the component support material should not exceed 170 Ksi in view of the susceptibility of high-strength materials to brittleness and stress corrosion cracking. Certain applications may exist where a UTS value of up to 190 Ksi could be considered acceptable for a material and, under this condition, the Design Specification should specify impact testing for the material. For these cases, it should be demonstrated by the applicant that: (1) the impact test results for the material meet Code requirements and (2) the material is not subject to stress corrosion cracking by virtue of the fact that (a) a corrosive environment is not present, and (b) the component that contains the material has essentially no residual stresses or assembly stresses, and it does not experience frequent sustained loads in service.
N-71-9 (1644-9)	Additional Materials for Component Supports Fabricated by Welding, Section III, Division 1, Subsection NF, Class 1, 2, 3, and MC Component Supports	5/11/81
	In the last sentence of paragraph 5.3, reference should be made to paragraph 4.5.2.2, “Alternate Atmosphere Exposure Time Periods Established by Test,” of the AWS D.1.1 Code for the evidence presented to and accepted by the Authorized Inspector concerning exposure of electrodes for longer periods of time.
N-71-10 N-71-11	Additional Materials for Component Supports Fabricated by Welding, Section III, Division 1, Subsection NF, Class 1, 2, 3, and MC Component Supports	6/17/82 2/14/83
	The maximum measured ultimate tensile strength (UTS) of the component support material should not exceed 170 Ksi in view of the susceptibility of high-strength materials to brittleness and stress corrosion cracking. Certain applications may exist where a UTS value of up to 190 Ksi could be considered acceptable for a material and, under this condition, the Design Specification should specify impact testing for the material. For these cases, it should be demonstrated by the applicant that: (1) the impact test results for the material meet Code requirements and (2) the material is not subject to stress corrosion cracking by virtue of the fact that (a) a corrosive environment is not present, and (b) the component that contains the material has essentially no residual stresses or assembly stresses, and it does not experience frequent sustained loads in service. In the last sentence of paragraph 5.3, reference should be made to paragraph 4.5.2.2, “Alternate Atmosphere Exposure Time Periods Established by Test,” of the AWS D.1.1 Code for the evidence presented to and accepted by the Authorized Inspector concerning exposure of electrodes for longer periods of time.
N-71-12	Additional Materials for Component Supports Fabricated by Welding, Section III, Division 1, Class 1, 2, 3 and MC	2/20/84
	The maximum measured ultimate tensile strength (UTS) of the component support material should not exceed 170 Ksi in view of the susceptibility of high-strength materials to brittleness and stress corrosion cracking. Certain applications may exist where a UTS value of up to 190 Ksi could be considered acceptable for a material and, under this condition, the Design Specification should specify impact testing for the material. For these cases, it should be demonstrated by the applicant that: (1) the impact test results for the material meet Code requirements and (2) the material is not subject to stress corrosion cracking by virtue of the fact that (a) a corrosive environment is not present, and (b) the component that contains the material has essentially no residual stresses or assembly stresses, and it does not experience frequent sustained loads in service. In the last sentence of paragraph 5.3, reference should be made to paragraph 4.5.2.2, “Alternate Atmosphere Exposure Time Periods Established by Test,” of the AWS D.1.1 Code for the evidence presented to and accepted by the Authorized Inspector concerning exposure of electrodes for longer periods of time. Paragraph 16.2.2 is not acceptable as written and should be replaced with the following: AWhen not exempted by 16.2.1, above, the postweld heat treatment shall be performed in accordance with NF-4622 except that for ASTM A-710 Grade A material, it should be at least 1000°F (540°C) and should not exceed 1150°F (620°C) for Class 1 and Class 2 material and 1175°F (640°C) for Class 3 material. The new holding time at temperature for weld thickness (nominal) should be 30 minutes for 2 inch or less, 1 hour per inch for thickness over 2 inch to 5 inches, and 5 hours plus 15 minutes for each additional inch over 5 inches.@
N-71-13 N-71-14 N-71-15 N-71-16 N-71-17	Additional Materials for Subsection NF, Classes 1, 2, 3 and MC Component Supports Fabricated by Welding, Section III, Division 1	12/05/85 12/16/86 2/12/93 12/31/96 12/08/00
	The maximum measured ultimate tensile strength (UTS) of the component support material should not exceed 170 Ksi in view of the susceptibility of high-strength materials to brittleness and stress corrosion cracking. Certain applications may exist where a UTS value of up to 190 Ksi could be considered acceptable for a material and, under this condition, the Design Specification should specify impact testing for the material. For these cases, it should be demonstrated by the applicant that: (1) the impact test results for the material meet Code requirements, and (2) the material is not subject to stress corrosion cracking by virtue of the fact that (a) a corrosive environment is not present, and (b) the component that contains the material has essentially no residual stresses or assembly stresses, and it does not experience frequent sustained loads in service. In the last sentence of paragraph 5.3, reference should be made to paragraph 4.5.2.2, “Alternate Atmosphere Exposure Time Periods Established by Test,” of the AWS D.1.1 Code for the evidence presented to and accepted by the Authorized Inspector concerning exposure of electrodes for longer periods of time. Paragraph 16.2.2 is not acceptable as written and should be replaced with the following: When not exempted by 16.2.1, above, the postweld heat treatment should be performed in accordance with NF‑4622 except that for ASTM A-710 Grade A material, it should be at least 1000°F (540°C) and should not exceed 1150°F (620°C) for Class 1 and Class 2 material and 1175°F (640°C) for Class 3 material. The new holding time at temperature for weld thickness (nominal) should be 30 minutes for 2 inch or less, 1 hour per inch for thickness over 2 inch to 5 inches, and 5 hours plus 15 minutes for each additional inch over 5 inches. The fracture toughness of Classes 1, 2, and 3 component supports should be characterized in accordance with Section 5.3.4 of NUREG-0800, “Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants” (Ref. 15), or on a case-by-case basis. The fracture toughness requirements as listed in this Code Case apply only to piping supports and not to Class 1, Class 2, and Class 3 component supports.
N-95-1 (1701-1)	Determination of Capacities of Vacuum Relief Valves, Section III, Division 1 and 2, Class MC	7/09/79
N-102-1 (1714-2)	Postweld Heat Treatment of P-1 Material, Section III, Class MC	8/28/78
N-119-2 (1739-2) N-119-3 (1739-3 N-119-4 (1739-4) N-119-5	Pump Internal Items, Section III, Division 1, Class 1, 2, and 3	8/25/80 12/01/80 7/18/85 9/05/85
N-122	Stress Indices for Structural Attachments, Class 1, Section III, Division 1	7/24/89
N-133 (1761-1)	Use of SB-148 Alloy CA954 for Section III, Division 1, Class 2 or 3 Flanged End Valves	1/14/77
N-133-1 N-133-2	Use of SB-148 Alloys 952 and 954, Section III, Division 1, Class 3	5/19/85 7/18/85
N-154 (1791)	Projection Resistance Welding of Valve Seats, Section III, Division 1, Class 1, 2 and 3 Valves	7/18/85
N-160 (1797)	Finned Tubing for Construction, Section III, Division 1	7/18/85
N-188	Use of Welded Ni-Fe-Cr-Mo-Cu (Alloy 825) and Ni-Cr-Mo-Cb (Alloy 625) Tubing, Section III, Division 1, Class 3	1/01/78
N-192 N-192-1 N-192-2	Use of Flexible Hose for Section III, Division 1, Class 1, 2, and 3 Construction	8/30/79 9/16/81 7/23/02
	The applicant should indicate system application, design and operating pressure, and pressure-temperature rating of the flexible hose. Data to demonstrate compliance of the flexible hose with NC/ND-3649, particularly NC-ND-3649.4(e), are required to be furnished with the application.
N-196	Exemption from the Shake-down Requirements When Plastic Analysis is Performed for Section III, Division 1, Class 1 Construction	1/08/79
N-207	Use of Modified SA-479 Type XM-19 for Section III, Division 1, Class 1, 2, or 3 Construction	3/19/79
N-208-1	Fatigue Analysis for Precipitation Hardening Nickel Alloy Bolting Material to Specification SB-637 N07718 for Section III Division 1, Class 1 Construction	2/14/03
N-214 N-214-1	Use of SA-351, Grade CN7M, for Valves for Section III, Division 1, Construction	9/07/82 5/25/83
N-224	Use of ASTM A500 Grade B and ASTM A501 Structural Tubing for Welded Attachments for Section III, Class 2 and 3 Construction	5/11/81
N-237	Hydrostatic Testing of Internal Piping, Section III, Division 1	9/07/82
N-237-1	Hydrostatic Testing of Internal Piping, Section III, Division 1, Classes 2 and 3	5/25/83
N-242	Materials Certification, Section III, Division 1, Classes 1, 2, 3, MC, and CS Construction	4/10/80
	Applicants should identify the components and supports requiring the use of paragraphs 1.0 through 4.0 of the Code Case in their safety analysis reports.
N-246	Use of SB-169 Alloy CA614, Section III, Division 1, Class 3	9/07/82
N-246-1	SB-169, Alloy C 61400, Section III, Division 1, Class 3	5/25/83
N-249	Additional Materials for Component Supports Fabricated Without Welding, Section III, Division 1, Subsection NF, Class 1, 2, 3, and MC Component Supports	5/11/81
	Footnote 2 of the Code Case should apply to all materials listed in Tables 1, 2, 3, 4, and 5 of the Code Case and should be so indicated on line 5 of the “Reply.”
N-249-1	Additional Materials for Component Supports Fabricated Without Welding, Section III, Division 1, Subsection NF, Class 1, 2, 3, and MC Component Supports	6/17/82
	Paragraph 7 of the “Reply” should reference the requirements of NF‑2600 instead of NF-2800. This is a typographical error in that NF‑2800 does not exist.
N-249-2 N-249-3	Additional Materials for Subsection NF Class 1, 2, 3, and MC Component Supports Fabricated Without Welding, Section III, Division 1	2/14/83 2/20/84
N-249-4 N-249-5	Additional Material for Subsection NF, Classes 1, 2, 3, and MC Component Supports Fabricated Without Welding, Section III, Division 1	9/17/84 4/08/85
	The fracture toughness requirements as listed in Code Case N-249-4 apply only to piping supports and not to Classes 1, 2, and 3 component supports. The fracture toughness of Classes 1, 2, and 3 component supports should be characterized in accordance with Section 5.3.4 of NUREG-0800, or on a case‑by‑case basis.
N-249-6 N-249-7 N-249-8 N-249-9 N-249-10 N-249-11 N-249-12 N-249-13	Additional Material for Subsection NF, Classes 1, 2, 3, and MC Component Supports Fabricated Without Welding, Section III, Division 1	9/05/85 12/05/85 12/16/86 5/06/89 5/13/91 2/12/93 5/11/94 12/08/00
	The fracture toughness requirements apply only to piping supports and not to Classes 1, 2, and 3 component supports. The fracture toughness of Classes 1, 2, and 3 component supports should be characterized in accordance with Section 5.3.4 of NUREG-0800 or on a case-by-case basis. The following is to be added to paragraph (5) of the Code Case: “For these cases, it should be demonstrated by the Owner that: (1) the impact test results for the material meet Code requirements, and (2) the material is not subject to stress corrosion cracking by virtue of the fact that: (a) a corrosive environment is not present and (b) the component that contains the material has essentially no residual stresses or assembly stresses, and it does not experience frequent sustained loads in service.”
N-260	Weld Repair of SA-182 Type 316 Forgings, Section III, Division 1, Classes 1, 2, 3, and MC	7/18/85
N-260-1	Weld Repair of SA-182 Type 316 Forgings, Section III, Division 1, Classes 1, 2, 3, and MC	12/05/85
	Type 308 L welding materials should not be used to repair grade F 316 N forgings because of the difference in strength levels.
N-265	Modified SA-487 Castings, Section III, Division 1, Class 1	5/19/85
N-284-1	Metal Containment Shell Buckling Design Methods, Section III, Division 1, Class MC	10/02/00
	This Code Case is listed in Regulatory Guide 1.193.
N-284-2	Metal Containment Shell Buckling Design Methods, Section III, Division 1, Class MC	1/10/07
N-299	Use of Nickel-Chromium-Molybdenum-Columbium Alloy 625 Forgings, Section III, Division 1, Class 2 and Class 3 Components	7/18/85
N-304 N-304-1 N-304-2 N-304-3	Use of 20 Cr-25Ni-6Mo (Alloy UNS N08366) Welded Tubes for Section III, Division 1, Classes 2 and 3 Construction	7/12/84 5/19/85 12/05/85 2/23/87
N-309	Identification of Materials for Component Supports, Section III, Division 1	5/11/84
N-318 N-318-1 N-318-2 N-318-3 N-318-4	Procedure for Evaluation of the Design of Rectangular Cross Section Attachments on Class 2 or 3 Piping, Section III, Division 1	2/20/84 7/12/84 9/05/85 12/11/89 4/28/94
	Applicants should identify in their safety analysis report: (1) the method of lug attachment, (2) the piping system involved, and (3) the location in the system where the Code Case is to be applied.
N-319 N-319-1 N-319-2	Alternate Procedure for Evaluation of Stresses in Butt Weld Elbows in Class 1 Piping, Section III, Division 1	7/24/89 8/14/90 1/17/00
N-321	Use of Modified SA-249, Type 304, Section III, Division 1, Class 1 Construction	12/05/85
N-337	Use of ASTM B 525-70 Grade II, Type II, Sintered Austenitic Stainless Steel for Class 2, 3, and MC Component Standard Supports, Section III, Division 1	7/18/85
N-345	Attachment of AMS 5382 Alloy 31 Seat Rings by Friction Welding, Section III, Division 1, Classes 1, 2, and 3	12/13/82
N-352	Use of SA-638 Grade 660 Forgings and Bars Below 700F Without Stress Rupture Tests, Section III, Division 1	7/18/85
N-362	Alternate Rules for Pressure Testing of Containment Items, Section III, Division 1	12/13/82
N-362-1	Pressure Testing of Containment Items, Section III, Division 1, Classes 1, 2, and MC	7/12/84
N-370 N-370-1	Modified SA-705 Grade XM-13 Forgings, Section III, Division 1	7/18/85 12/05/85
N-371	12Cr-1W-1Mo-1/4V Martensitic Stainless Steel Valve Internals, Section III, Division 1	7/18/85
N-373-1 N-373-2	Alternative PWHT Time at Temperature for P-No. 5 Material, Section III, Division 1, Classes 1, 2, and 3	9/07/01 11/02/04
N-379	Bimetallic Tubing Section III, Division 1, Class 1	7/18/85
N-383	Weld Repair of SA-182 Austenitic Forgings, Section III, Division 1, Classes 1, 2, and 3	7/18/85
	Applicants who apply the provisions of the Code Case to permit material manufacturers to weld repair austenitic forgings without resolution heat treatment should provide justification to the NRC staff (via the safety analysis report) why this is acceptable for their applications, including their evaluation of the susceptibility for stress corrosion cracking.
N-391	Procedure for Evaluation of the Design of Hollow Circular Cross Section Welded Attachments on Class 1 Piping, Section III, Division 1	7/24/89
N-391-1	Procedure for Evaluation of the Design of Hollow Circular Cross Section Welded Attachments on Class 1 Piping, Section III, Division 1	8/24/95
	The following typographical errors need to be corrected: In equation (3) the + sign should be changed to an = sign, and In equation (4) the first + sign should be changed to an = sign.
N-392	Procedure for Evaluation of the Design of Hollow Circular Cross Section Welded Attachments on Classes 2 and 3 Piping, Section III, Division 1	12/11/89
N-392-1	Procedure for Evaluation of the Design of Hollow Circular Cross Section Welded Attachments on Classes 2 and 3 Piping, Section III, Division 1	12/11/92
	Applicants should identify in their safety analysis report: the method of lug attachment, the piping system involved, and the location in the system where the Code Case is to be applied.
N-392-2	Procedure for Evaluation of the Design of Hollow Circular Cross Section Welded Attachments on Classes 2 and 3 Piping, Section III, Division 1	12/12/94
	Applicants should identify in their safety analysis report: the method of lug attachment, the piping system involved, and the location in the system where the Code Case is to be applied.
N-411	Alternative Damping Values for Seismic Analysis of Classes 1, 2, and 3 Piping Sections, Section III, Division 1	2/20/86
	The damping values specified may be used in analyzing piping response for seismic and other dynamic loads being filtered through building structures provided response mode frequencies are limited to 33 Hz and below. Within this range, the Code Case damping should be used completely and consistently, if used at all. [For equipment other than piping, the damping values specified in Regulatory Guide 1.61 should be used.] The damping values specified may be used only in those analyses in which current seismic spectra and procedures have been employed. Such use should be limited only to response spectral analyses [similar to that used in the study supporting its acceptance, NUREG/CR-3526]. The acceptance of the use with other types of dynamic analyses (e.g., time-history analysis) is pending further justification. When used for reconciliation work or for support optimization of existing designs, the effects of increased motion on existing clearances and on line mounted equipment should be checked. This Code Case is not appropriate for analyzing the dynamic response of piping systems using supports designed to dissipate energy by yielding (i.e., the design of which is covered by Code Case N-420). (5) This Code Case is not applicable to piping in which stress corrosion cracking has occurred unless a case-specific evaluation is made and is reviewed by the NRC staff.
N-418	Use of Seamless Ni-Fe-Cr-Mo-Cu Low Carbon (UNS N08028 and UNS N08904) Tubing, Section III, Division 1, Classes 2 and 3	7/30/86
N-438 N-438-1 N-438-2	Fe-24.5Ni-21Cr-6.5 Mo-0.2N (Alloy UNS N08367) Seamless and Welded Pipe, Tube, Plate, Bar, Fittings, and Forgings, Class 2 and 3 Construction, Section III, Division 1	3/08/89 Reinstated on 5/24/96 7/27/92
N-438-3	UNS N08367 Material, Section III, Division 1, Class 2 and 3 Construction	5/24/96
N-439	Use of 20Cr-18Ni-6Mo (Alloy UNS S31254) Forgings, Plate, Seamless and Welded Pipe, and Welded Tube, Class 2 and 3 Construction, Section III, Division 1	7/10/00
N-440	Use of 20Cr-18Ni-6Mo (Alloy UNS J93254) Castings, Class 2 and 3 Construction, Section III, Division 1	7/10/00
N-441 N-441-1	Use of 20Cr-18Ni-6Mo (Alloy UNS S31254) Fittings, Class 2 and 3 Construction, Section III, Division 1	11/25/92 7/10/00
N-443 N-443-1	High Yield Strength Cr-Mo Steel, Class 1 Components, Section III, Division 1	3/08/89 11/11/99
N-453	Nickel-Chromium-Molybdenum-Copper Stainless Steel (UNS N08925) Welded Pipe for Class 2 and 3 Construction, Section III, Division 1	11/30/88
N-453-1	Nickel-Chromium-Molybdenum-Copper Stainless Steel (UNS N08925) Seamless and Welded Pipe for Class 2 and 3 Construction, Section III, Division 1	4/30/92
N-453-2	Nickel-Chromium-Molybdenum-Copper Stainless Steel (UNS N08925 and N08926) Seamless and Welded Pipe for Class 2 and 3 Construction, Section III, Division 1	12/12/95
N-454	Nickel-Chromium-Molybdenum-Copper Stainless Steel (UNS N08925) Wrought Fittings for Class 2 and 3 Construction, Section III, Division 1	4/30/92
N-455	Nickel-Chromium-Molybdenum-Copper Stainless Steel (UNS N08925) Forged Flanges and Fittings for Class 2 and 3 Construction, Section III, Division 1	4/30/92
N-466	Modified 9Cr-1Mo Material, Section III, Division 1, Classes 1, 2, and 3	4/30/90
N-469	Martensitic Stainless Steel for Class 1, 2, and 3 Components, Section III, Division 1	6/14/00
N-474	Design Stress Intensities and Yield Strength Values for Alloy 690 With a Minimum Yield Strength of 35 ksi, Class 1 Components, Section III, Division 1	3/05/90
N-474-1	Design Stress Intensities and Yield Strength Values for UNS N06690 With a Minimum Specified Yield Strength of 35 ksi, Class 1 Components, Section III, Division 1	12/09/93
N-484	Real Time Radioscopic Examination of Welds, Section III, Division 1	12/16/91
N-492	Grade 9 Titanium Alloy Tubing, Section III, Division 1, Class 1, 2, and 3	5/11/94
N-497	Use of Fe-Ni-Cr-Mo-N (C-N-3MN) Cast Materials, Section III, Division 1, Class 2 and 3 Construction	12/09/93
N-500 N-500-1 N-500-2 N-500-3	Alternative Rules for Standard Supports for Classes 1, 2, 3, and MC, Section III, Division 1	12/09/93 8/14/01 2/20/04 8/05/11
N-510	Borated Stainless Steel for Class CS Core Support Structures and Class 1 Components, Section III, Division 1	12/12/94
N-520 N-520-1 N-520-2 N-520-3 N-520-4	Alternative Rules for Renewal of N-type Certificates for Plants Not in Active Construction, Section III, Division 1	10/26/94 5/09/03 11/01/07 11/10/09 3/13/12
N-564 N-564-1	UNS J93380, Alloy CD3MWCuN, Class 2 and 3 Construction, Section III, Division 1	7/30/98 12/31/96
N-570 N-570-1	Alternative Rules for Linear Piping and Linear Standard Supports for Classes 1, 2, 3, and MC, Section, III, Division 1	3/28/06 1/05/06
N-580 N-580-1	Use of Alloy 600 With Columbium Added, Section III, Division 1	5/26/97 5/20/98
N-594	Repairs to P-4 and P-5A Castings Without Postweld Heat Treatment Class 1, 2, and 3 Construction, Section III, Division 1	3/02/98
N-595-3	Requirements for Spent Fuel Storage Canisters, Section III, Division 1	4/08/02
	The canisters must be made from austenitic stainless steel Type 304 or 316.
N-621	Ni-Cr-Mo Alloy (UNS N06022) Welded Construction to 800°F, Section III, Division 1	11/02/04
N-625	Ni-Cr-Mo Alloy (UNS N06059) Welded Construction to 800°F, Section III, Division 1	3/28/01
N-644	Weld Procedure Qualification for Procedures Exempt from PWHT in Class 1, 2, and 3 Construction, Section III, Division 1	Reinstated 2/14/03
N-655	Use of SA-738, Grade B, for Metal Containment Vessels, Class MC, Section III, Division 1	2/25/02
	For metal containment vessels up to 1.75 inch thick: (1) Supplementary Requirement S17, “Vacuum Carbon-Deoxidized Steel,” of Material Specification SA-738 must be applied to the material, and (2) Supplementary Requirement S20, “Maximum Carbon Equivalent for Weldability,” of Material Specification SA-738 must be applied to the material.
N-757	Alternative Rules for Acceptability for Class 2 and 3 Valves (DN 25) and Smaller with Welded and Nonwelded End Connections Other than Flanges, Section III, Division 1	1/21/07
N-759 N-759-1	Alternative Rules for Determining Allowable External Pressure and Comprehensive Stresses for Cylinders, Cones, Spheres, and Formed Heads, Class 1, 2, and 3, Section III, Division 1	10/04/06 10/19/07
N-760 N-760-1	Welding of Valve Plugs to Valve Stem Retainers, Classes 1, 2, and 3, Section III, Division 1	3/27/07 2/12/08
1332-6	Requirements for Steel Forgings, Section III, Division 1	3/01/79
1335-9	Requirements for Bolting Materials	8/28/78
1337-9 1337-10	Special Type 403 Modified Forgings or Bars, Section III	4/28/75 5/15/78
1395-3	SA-508, Class 2 Forgings with Modified Manganese Content, Section III or Section VIII, Division 2	1/08/79
1407-2	Time of Examination for Class 1, 2, and 3, Section III Vessels	7/01/74
1414-3 1414-4	High Yield Strength Cr-Mo Steel for Section III, Division 1, Class 1 Vessels	3/1/76 8/9/77
	The information required to be developed by Note 1 in the Code Case should be provided in each referencing safety analysis report.
1484-1	SB-163 Nickel-Chromium-Iron Tubing (Alloy 600) at a Specified Minimum Yield Strength of 40.0 ksi, Section III, Class 1	11/04/74
1484-2	SB-163 Nickel-Chromium-Iron Tubing (Alloy 600 and 690) at a Specified Minimum Yield Strength of 40.0 ksi, Section III, Class 1	8/13/76
1492	Post Weld Heat Treatment, Section I, III and VIII, Division 1 and 2	3/03/75
1508	Allowable Stresses, Design Intensity and/or Yield Strength Values, Section I, III, and VIII, Divisions 1 and 2	6/30/75
1516-1	Welding of Seats in Valves for Section III Applications	8/11/75
1540-1	Elastomer Diaphragm Valves, Section III, Classes 2 and 3	1/14/77
1541-1	Hydrostatic Testing of Embedded Class 2 and Class 3 Piping for Section III Construction	9/30/76
1541-2	Hydrostatic Testing of Embedded Class 2 and Class 3 Piping for Section III, Division 1 Construction	5/15/78
1552	Design by Analysis of Section III, Class 1 Valves	8/29/77
1553	Upset Heading and Roll Threading of SA-453 for Bolting in Section III	3/03/75
1555	Certification of Safety Relief Valves on Liquids	1/14/77
1557-2	Steel Products Refined by Secondary Remelting	1/08/79
1606	Stress Criteria for Section III, Class 2 and 3 Piping Subjected to Upset, Emergency, and Faulted Operating Conditions	12/16/74
	Code Case 1606 was acceptable subject to the interpretation that the stress limit designations of “Upset,” “Emergency,” and “Faulted” do not necessarily imply agreement with specified plant conditions applicable to ASME Code Class 2 and 3 components for fluid systems. These designations should be established and justified in the design specifications.
1607	Stress Criteria for Section III, Classes 2 and 3 Vessels Subjected to Upset, Emergency, and Faulted Operating Conditions	11/04/74
	Code Case 1607 was acceptable subject to the interpretation that the stress limit designations of “Upset,” “Emergency,” and “Faulted” do not necessarily imply agreement with specified plant conditions applicable to ASME Code Class 2 and 3 components for fluid systems. These designations should be established and justified in the design specifications.
1618	Material for Core Support Structures, Section III, Subsection NG	3/03/75
	(a) Welding of age-hardenable alloy SA-453 Grade 660 and SA-637 Grade 688 should be performed when the material is in the solution-treated condition. (b) Use of alloy ASTM A‑564 Grade 631 is not acceptable on a generic basis.
1618-1	Material for Core Support Structures, Section III, Subsection NG	3/01/76
	Welding of age-hardenable alloy SA-453 Grade 660 and SA‑637 Grade 688 should be performed when the material is in the solution‑treated condition.
1626	Normalized and Tempered 1-1/4 Cr Low Alloy Steel Forgings, Section I, Section III, and Section VIII, Division 1 and 2	1/08/79
1634 1634-1	Use of SB-359 for Section III, Class 3 Construction	8/12/74 8/13/76
1644 1644-1 1644-2 1644-3	Additional Materials for Component Supports, Section III, Subsection NF, Class 1, 2, 3, and MC Construction	4/28/75 6/30/75 11/03/75 3/01/76
	The maximum measured ultimate tensile strength of the component support material should not exceed 170 ksi.
1644-4 1644-5 1644-6	Additional Materials for Component Supports and Alternate Design Requirements for Bolted Joints, Section III, Division 1, Subsection NF, Class 1, 2, 3, and MC Construction	8/13/76 3/03/77 11/21/77
	The maximum measured ultimate tensile strength (UTS) of the component support material should not exceed 170 ksi in view of the susceptibility of high-strength materials to brittleness and stress corrosion cracking. Certain applications may exist where a UTS value of up to 190 ksi could be considered acceptable for a material and, under this condition, the Design Specification should specify impact testing for the material. For these cases, it should be demonstrated by the applicant that (1) the impact test results for the material meet code requirements, and (2) the material is not subject to stress corrosion cracking by virtue of the fact that (a) a corrosive environment is not present and (b) the component that contains the material has essentially no residual stresses or assembly stresses, and it does not experience frequent sustained loads in service.
1682	Alternate Rules for Material Manufacturers and Suppliers, Section III, Subarticle NA-3700	8/11/75
1683	Bolt Holes for Section III, Division 1, Class 1, 2, 3 and MC Component Supports	3/01/76
1689	Alternate PWHT Time and Temperature for SA-182 Grade F22, Section III, Class 1, 2, 3 and CS	9/10/76
	The alternate postweld heat treatment should be prequalified along with the applicable welding procedure in accordance with ASME Section IX.
1695	Brazing, Section III, Class 3	11/03/75
1701	Determination of Capacities of Vacuum Relief Valves, Section III, Class MC	3/20/78
1702	Flanged Valves Larger than 24 inches for Section III, Class 1, 2 and 3 Construction	7/11/77
1714	Postweld Heat Treatment of P-1 Material, Section III, Class MC	7/11/77
1720	Weld End Preparation for Section III, Division Construction	3/01/76
	Weld end preparations other than those shown in Figures 1, 2, and 3 of the Code Case are not acceptable on a generic basis. Such alternative end preparations should be treated on a case-by-case basis.
1720-1	Weld End Preparation for Section III, Division Construction	11/20/78
	The acceptance of weld end preparations other than those shown in Figures 1, 2, and 3 of the Code Case should be evaluated on a case‑by-case basis.
1722	Vacuum, Carbon Deoxidized SA-508 Forgings, Section III, Division 1, and VIII, Division 1 and 2	1/08/79
1741	Interim Rules for the Required Number of Impact Tests for Rolled Shapes, Section III, Division 1, Subsection NF, Component Supports	1/14/77
1755	Alternate Rules for Examination of Welds in Piping, Class 1 and 2 Construction, Section III, Division 1	1/14/77
1759	Material for Internal Pressure Retaining Items for Pressure Relief Valves, Section III, Division 1, Class 1, 2, and 3	5/15/78
	Applicants using this Case should also use Code Case 1711 for the design of pressure relief valves.
1761	Use of SG-148 Alloy CA954 for Section III, Division 1, Class 2 or 3 Flanged End Valves	1/14/77
1769	Qualification of NDE Level III Personnel, Section III, Division 1	2/16/77
1774	Minimum Wall Thickness for Class 2 and 3 Valves, Section III, Division 1	7/11/77
1780	Hydrostatic Testing and Stamping of Pumps for Class 1 Construction, Section III, Division 1	3/10/78
	Each licensing application in which the Code Case is to be used should present information that satisfactorily demonstrates that the subassembly tests adequately simulate the pressure loadings. Also, the closure fixture for the test subassembly should adequately simulate the rigidity of adjacent subassemblies and also simulate the interface loadings from adjacent subassemblies that would result from a hydrostatic pressure test of a complete pump assembly. As a minimum, the closure fixture should impose loads that result in stresses equal to or greater than those induced during the hydrostatic test of a complete pump assembly. It is not intended that piping reactor loadings be simulated in the hydrostatic testing
1783	Qualification of Nondestructive Personnel, Section III, Division 1	1/14/77
	The first sentence of paragraph (1) should be replaced with the following: “The certification of the Level III nondestructive examination personnel for the purposes of this Section of the Code shall be the responsibility of the employer of the Level III individual. If the employer is not a Certificate Holder, then the verification of such certificate is the responsibility of the Certificate Holder.”

D. IMPLEMENTATION

The purpose of this section is to provide information to applicants and licensees regarding the NRC staff’s plans for using this regulatory guide. The requirements addressing implementation of Section III Code Cases are contained in 10 CFR 50.55a(b)(4). No backfit is intended or approved in connection with the issuance of this guide.

REGULATORY ANALYSIS

A separate regulatory analysis was not prepared for this regulatory guide. The regulatory analysis for this guide is the regulatory analysis prepared for the amendment to 10 CFR 50.55a, “Codes and Standards.” The amendment to 10 CFR 50.55a incorporates this regulatory guide by reference.

REFERENCES⁰

1. Code of Federal Regulations, Title 10, Energy, Part 50, “Domestic Licensing of Production and Utilization Facilities” (10 CFR Part 50), U.S. Nuclear Regulatory Commission, Washington, DC.

2. ASME Boiler and Pressure Vessel Code, Section III, “Rules for Construction of Nuclear Power Plant Components,” Division I, American Society of Mechanical Engineers, New York, NY.⁰

3. Regulatory Guide 1.147, “Inservice Inspection Code Case Acceptability, ASME Section XI, Division 1,” U.S. Nuclear Regulatory Commission, Washington, DC.

4. Regulatory Guide 1.192, “Operation and Maintenance Code Case Acceptability, ASME OM Code,” U.S. Nuclear Regulatory Commission, Washington, DC.

5. Regulatory Guide 1.193, “ASME Code Cases Not Approved for Use,” U.S. Nuclear Regulatory Commission, Washington, DC.

6. Paperwork Reduction Act of 1995 (Public Law 104-13), United States Code, Title 44, “Public Printing and Documents,” Chapter 35, “Coordination of Federal Information Policy” (44 U.S.C. 3501 et seq.), 104^th Congress of the United States of America, Washington, DC.⁰

7. ASTM A 262-70, “Standard Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels,” American Society for Testing and Materials, West Conshohocken, PA.⁰

8. ASTM A 708-74, “Practice for Detection of Susceptibility to Intergranular Corrosion in Severely Sensitized Austenitic Stainless Steels,” American Society for Testing and Materials, West Conshohocken, PA.⁶

9. Regulatory Guide 1.122, “Development of Floor Design Response Spectra for Seismic Design of Floor-Supported Equipment or Components,” U.S. Nuclear Regulatory Commission, Washington, DC.

10. Regulatory Guide 1.61, “Damping Values for Seismic Design of Nuclear Power Plants,” U.S. Nuclear Regulatory Commission, Washington, DC.

11. NUREG/CR-3526, “Impact of Changes in Damping and Spectrum Peak Broadening on the Seismic Response of Piping Systems,” U.S. Nuclear Regulatory Commission, Washington, DC.

12. Regulatory Guide 1.31, “Control of Ferrite Content in Stainless Steel Weld Metal,” U.S. Nuclear Regulatory Commission, Washington, DC.

13. Regulatory Guide 1.44, “Control of the Use of Sensitized Stainless Steel,” U.S. Nuclear Regulatory Commission, Washington, DC.

14. Regulatory Guide 1.67, “Installation of Over-Pressure Protection Devices,” U.S. Nuclear Regulatory Commission, Washington, DC.

15. NUREG-0800, “Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants (LWR Edition),” Section 9.5.1, “Fire Protection System,” U.S. Nuclear Regulatory Commission, Washington, DC.

Edition	Supplement Number	BNCS1 Approval Date of Code Cases in Supplement2
2007	11	November 10, 2009
2010	0	December 25, 2009
2010	1	April 9, 2010
2010	2	June 24, 2010
2010	3	September 20, 2010
2010	4	December 23, 2010
2010	5	March 24, 2011
2010	6	July 15, 2011
2010	7	October 14, 2011
2010	8	December 29, 2011
2010	9	April 4, 2012
2010	10	July 16, 2012
1 BNCS = ASME Board on Nuclear Codes and Standards 2 Publication of supplements approximately 6 months after BNCS approval.

N-201-6²

N-284-3

N-500-3³

N-500-4

N-520-3

N-520-4

N-520-5

N-594-1

N-637-1

N-655-2

N-755-1²

N-761²

N-763

N-777

N-785

N-791²

N-792²

N-793²

N-794²

N-796²

N-801⁴

N-802⁴

N-804²

N-807²

N-811

N-812²

N-815

N-816

N-817

N-818²

N-819

N-820²

N-822

N-828²

N-1-7 [T3]

N-2 [T3]

N-3-10 [T3]

N-4-11 [T5]

N-4-12 [T5]

N-4-13 [T1]

N-5 [T5]

N-5-1 [T3]

N-6 [T3]

N-7 [T5]

N-7-1 [T1]

N-9-4 [T3]

N-10 [T3]

N-11-5 [T4]

N-15 [T3]

N-17 [T3]

N-20 [T5]

N-20-1 [T5]

N-20-2 [T5]

N-20-3 [T5]

N-20-4 [T3]

N-22 [T3]

N-24 [T3]

N-26 [T3]

N-30-1 [T3]

N-31 [T5]

N-31-1 [T4]

N-32-3 [T3]

N-32-4 [T4]

N-33 [T3]

N-35-1 [T3]

N-37-3 [T3]

N-41 [T3]

N-43 [T3]

N-46 [T3]

N-47-33 [T3]

N-48-2 [T3]

N-49-4 [T3]

N-50-1 [T3]

N-51-2 [T3]

N-55 [T5]

N-55-1 [T3]

N-56 [T3]

N-60 [T5]

N-60-1 [T5]

N-60-2 [T5]

N-60-3 [T5]

N-60-4 [T5]

N-60-5 [T2]

N-61 [T3]

N-62-2 [T5]

N-62-3 [T5]

N-62-4 [T5]

N-62-5 [T5]

N-62-6 [T5]

N-62-7 [T2]

N-65-1 [T3]

N-66-1 [T3]

N-68 [T3]

N-71-7 [T5]

N-71-8 [T5]

N-71-9 [T5]

N-71-10 [T5]

N-71-11 [T5]

N-71-12 [T5]

N-71-13 [T5]

N-71-14 [T5]

N-71-15 [T5]

N-71-16 [T5]

N-71-17 [T5]

N-71-18 [T2]

N-77 [T3]

N-81 [T3]

N-82 [T3]

N-84 [T3]

N-90 [T3]

N-92 [T4]

N-94 [T3]

N-95-1 [T5]

N-95-2 [T3]

N-96-1 [T3]

N-100 [T4]

N-101 [T3]

N-102-1 [T5]

N-102-2 [T3]

N-106-2 [T4]

N-107-1 [T3]

N-108 [T3]

N-109 [T3]

N-110 [T4]

N-111 [T3]

N-114 [T3]

N-115 [T3]

N-116 [T4]

N-119-2 [T5]

N-119-3 [T5]

N-119-4 [T5]

N-119-5 [T5]

N-119-6 [T3]

N-121 [T3]

N-122 [T5]

N-122-2 [T1]

N-123 [T3]

N-124 [T3]

N-125 [T3]

N-126 [T3]

N-127 [T3]

N-131-1 [T1]

N-133 [T5]

N-133-1 [T5]

N-133-2 [T5]

N-133-3 [T1]

N-139 [T3]

N-140 [T3]

N-142-1 [T3]

N-146-1 [T4]

N-147 [T3]

N-148 [T3]

N-154 [T5]

N-154-1 [T1]

N-155-2 [T2]

N-156 [T3]

N-157 [T3]

N-158 [T3]

N-159 [T3]

N-160 [T5]

N-160-1 [T3]

N-171 [T1]

N-174 [T3]

N-175 [T4]

N-176-1 [T3]

N-177 [T3]

N-178 [T3]

N-179 [T3]

N-180 [T3]

N-181 [T3]

N-182 [T3]

N-183 [T3]

N-184 [T3]

N-188 [T5]

N-188-1 [T3]

N-189 [T3]

N-190 [T3]

N-192 [T5]

N-192-1 [T5]

N-192-2 [T5]

N-192-3 [T1]

N-193 [T3]

N-196 [T5]

N-196-1 [T3]

N-199 [T4]

N-201-6²

N-204 [T3]

N-205 [T1]

N-206 [T3]

N-207 [T5]

N-207-1 [T3]

N-208-1 [T5]

N-208-2 [T4]

N-212 [T3]

N-213 [T1]

N-214 [T5]

N-214-1 [T5]

N-214-2 [T3]

N-215 [T3]

N-217-1 [T3]

N-220 [T3]

N-223 [T3]

N-224 [T5]

N-224-1 [T3]

N-225 [T3]

N-226 [T3]

N-227 [T3]

N-228 [T3]

N-229 [T3]

N-231 [T3]

N-233 [T3]

N-237 [T5]

N-237-1 [T5]

N-237-2 [T3]

N-238 [T4]

N-240 [T3]

N-241 [T3]

N-242 [T5]

N-242-1 [T4]

N-243 [T3]

N-245 [T3]

N-246 [T5]

N-246-1 [T5]

N-246-2 [T3]

N-247 [T3]

N-248 [T3]

N-249 [T5]

N-249-1 [T5]

N-249-2 [T5]

N-249-3 [T5]

N-249-4 [T5]

N-249-5 [T5]

N-249-6 [T5]

N-249-7 [T5]

N-249-8 [T5]

N-249-9 [T5]

N-249-10 [T5]

N-249-11 [T5]

N-249-12 [T5]

N-249-13 [T5]

N-249-14 [T2]

N-252 [T4]

N-259 [T3]

N-260 [T5]

N-260-1 [T5]

N-260-2 [T4]

N-261 [T3]

N-262 [T3]

N-263 [T4]

N-265 [T5]

N-265-1 [T3]

N-267 [T3]

N-271 [T3]

N-272 [T3]

N-274 [T4]

N-275 [T4]

N-276 [T3]

N-277 [T3]

N-279 [T4]

N-280 [T3]

N-281 [T3]

N-282 [T3]

N-284-1²

N-284-2 [T5]

N-284-3 [T1]

N-292 [T4]

N-294 [T3]

N-295 [T3]

N-296 [T3]

N-298 [T3]

N-299 [T5]

N-299-1 [T3]

N-300 [T3]

N-302 [T3]

N-304 [T5]

N-304-1 [T5]

N-304-2 [T5]

N-304-3 [T5]

N-304-4 [T3]

N-309 [T5]

N-309-1 [T3]

N-310-1 [T4]

N-313 [T3]

N-314 [T4]

N-315 [T1]

N-316 [T3]

N-317 [T3]

N-318 [T5]

N-318-1 [T5]

N-318-2 [T5]

N-318-3 [T5]

N-318-4 [T5]

N-318-5 [T1]

N-319 [T5]

N-319-1 [T5]

N-319-2 [T5]

N-319-3 [T1]

N-320 [T3]

N-321 [T5]

N-321-1 [T3]

N-324 [T3]

N-328 [T3]

N-329 [T3]

N-336 [T3]

N-337 [T5]

N-337-1 [T3]

N-339 [T3]

N-341 [T3]

N-342 [T3]

N-345 [T5]

N-345-1 [T3]

N-346 [T3]

N-347 [T3]

N-348 [T4]

N-348-1 [T4]

N-348-2 [T4]

N-349 [T3]

N-350 [T4]

N-351 [T1]

N-352 [T5]

N-352-1 [T3]

N-353 [T3]

N-354-1 [T3]

N-355 [T3]

N-357 [T3]

N-359 [T3]

N-362 [T5]

N-362-1 [T5]

N-362-2 [T3]

N-367 [T3]

N-368 [T3]

N-369 [T1]

N-370 [T5]

N-370-1 [T5]

N-370-2 [T3]

N-371 [T5]

N-371-1 [T3]

N-372 [T3]

N-373-1 [T5]

N-373-2 [T5]

N-373-3 [T1]

N-376 [T3]

N-377 [T3]

N-378 [T3]

N-379 [T5]

N-379-1 [T3]

N-383 [T5]

N-383-1 [T4]

N-384-1 [T3]

N-387 [T3]

N-388 [T3]

N-391 [T5]

N-391-1 [T5]

N-391-2 [T1]

N-392 [T5]

N-392-1 [T5]

N-392-2 [T5]

N-392-3 [T1]

N-393 [T3]

N-394 [T3]

N-395 [T3]

N-397 [T4]

N-398 [T4]

N-403 [T3]

N-404 [T4]

N-405-1 [T1]

N-410 [T3

N-411 [T5]

N-411-1 [T4]

N-412 [T3]

N-413 [T3]

N-414 [T3]

N-418 [T5]

N-418-1 [T3]

N-420 [T3]

N-421 [T3]

N-430 [T4]

N-433 [T3]

N-438 [T5]

N-438-1 [T1][T5]

N-438-2 [T5]

N-438-3 [T5]

N-438-4 [T3]

N-439 [T5]

N-439-1 [T3]

N-440 [T5]

N-440-1 [T3]

N-441 [T5]

N-441-1 [T5]

N-441-2 [T3]

N-442 [T3]

N-443 [T5]

N-443-1 [T5]

N-443-2 [T3]

N-451 [T3]

N-452 [T1]

N-453 [T5]

N-453-1 [T5]

N-453-2 [T5]

N-453-3 [T1]

N-454 [T5]

N-454-1 [T1]

N-455 [T5]

N-455-1 [T1]

N-459 [T3]

N-462 [T3]

N-464 [T3]

N-466 [T5]

N-466-1 [T3]

N-468 [T3]

N-469 [T5]

N-469-1 [T1]

N-470 [T3]

N-474 [T5]

N-474-1 [T5]

N-474-2 [T3]

N-475 [T3]

N-476 [T3]

N-482 [T3]

N-483-2²

N-483-3²

N-484 [T5]

N-484-1 [T3]

N-492 [T5]

N-492-1 [T3]

N-493 [T1]

N-497 [T5]

N-497-1 [T3]

N-500 [T5]

N-500-1 [T5]

N-500-2 [T5]

N-500-3 [T5]

N-500-4 [T1]

N-501 [T3]

N-502 [T3]

N-505 [T1]

N-507 [T3]

N-510 [T5]

N-510²

N-510-1²

N-511 [T1]

N-519² [T3]

N-520 [T5]

N-520-1 [T5]

N-520-2 [T5]

N-520-3 [T5]

N-520-4 [T5]

N-520-5 [T1]

N-525 [T1]

N-530²

N-539 [T1]

N-540 [T3]

N-548 [T1]

N-549 [T3]

N-550 [T3]

N-551 [T3]

N-558 [T1]

N-559 [T3]

N-564 [T5]

N-564-1 [T5]

N-564-2 [T1]

N-565²

N-570 [T5]

N-570-1 [T5]

N-570-2 [T1]

N-572 [T1]

N-579 [T1]

N-580 [T5]

N-580-1 [T5]

N-580-2 [T1]

N-594 [T5]

N-594-1 [T1]

N-595²

N-595-1²

N-595-2²

N-595-3 [T5]

N-595-4 [T4]

N-596 [T3]

N-607 [T1]

N-608 [T3]

N-610 [T1]

N-611 [T1]

N-620 [T1]

N-621 [T5]

N-621-1 [T1]

N-625 [T5]

N-625-1 [T1]

N-626 [T2]

N-631 [T1]

N-632 [T1]

N-634

N-635 [T5]

N-635-1 [T1]

N-636 [T1]

N-637 [T5]

N-637-1 [T1]

N-642 [T1]

N-644 [T5]

N-644-1 [T1]

N-645²

N-645-1²

N-646 [T1]

N-650 [T1]

N-655 [T5]

N-655-1 [T5]

N-655-2 [T1]

N-656 [T2]

N-657 [T1]

N-659²

N-659-1²

N-659-2²

N-673²

N-692 [T1]

N-693²

N-698 [T1]

N-699 [T1]

N-703 [T1]

N-707²

N-708 [T1]

N-710 [T1]

N-721²

N-725 [T1]

N-727 [T1]

N-728²

N-732 [T3]

N-736 [T1]

N-738 [T1]

N-741 [T1]

N-744 [T1]

N-746 [T1]

N-755²

N-755-1²

N-756 [T1]

N-757 [T5]

N-757-1 [T2]

N-759 [T5]

N-759-1 [T5]

N-759-2 [T1]

N-760 [T5]

N-760-1 [T5]

N-760-2 [T1]

N-761²

N-763[T1]

N-767 [T1]

N-774 [T1]

N-777 [T1]

N-782 [T1]

N-785 [T1]

N-791²

N-792²

N-793²

N-794²

N-796²

N-801 [T1]

N-802 [T1]

N-804²

N-807²

N-811 [T1]

N-812²

N-815 [T1]

N-816 [T1]

N-817 [T1]

N-818²

N-819 [T1]

N-820

N-822 [T1]

N-828²

1141-7 [T3]

1332-6 [T5]

1335-9 [T5]

1337-9 [T5]

1337-10 [T5]

1361-2 [T4]

1395-3 [T5]

1407-2 [T5]

1412-4 [T4]

1414-3 [T5]

1414-4 [T5]

1423-2 [T4]

1434-1 [T3]

1461-1 [T3]

1470-2 [T3]

1471-1 [T3]

1475-1 [T3]

1477-1 [T3]

1484-1 [T5]

1484-2 [T5]

1492 [T5]

1494-1 [T3]

1506 [T3]

1508 [T5]

1515 [T3]

1516-1 [T5]

1521-1 [T4]

1528-3 [T4]

1529 [T3]

1531 [T3]

1532 [T3]

1533 [T3]

1535-2 [T3]

1536 [T3]

1540-1 [T5]

1541-1 [T5]

1541-2 [T5]

1552 [T5]

1553 [T5]

1553-1 [T3]

1555 [T5]

1555-1 [T3]

1557-2 [T5]

1567 [T3]

1568 [T3]

1569 [T4]

1573 [T3]

1574 [T3]

1580-1 [T3]

1581 [T3]

1583 [T3]

1587 [T3]

1590 [T3]

1601 [T3]

1602-1 [T3]

1603 [T3]

1605 [T3]

1606 [T5]

1606-1 [T4]

1607 [T5]

1607-1 [T4]

1608-1 [T3]

1613 [T3]

1614 [T3]

1614 [T3]

1615 [T3]

1616 [T3]

1618 [T5]

1618-1 [T5]

1622 [T3]

1623 [T3]

1625 [T3]

1626 [T5]

1633 [T3]

1634 [T5]

1634-1 [T5]

1635-1 [T4]

1636-1 [T4]

1637 [T3]

1644 [T5]

1644-1 [T5]

1644-2 [T5]

1644-3 [T5]

1644-4 [T5]

1644-5 [T5]

1644-6 [T5]

1645 [T3]

1648 [T3]

1649 [T3]

1650 [T3]

1651 [T3]

1657 [T3]

1659 [T3]

1661 [T3]

1662 [T3]

1664 [T3]

1666 [T3]

1672 [T3]

1675 [T3]

1676 [T3]

1678 [T3]

1682 [T5]

1682-1 [T3]

1683 [T5]

1683-1 [T3]

1684 [T3]

1685 [T3]

1686 [T3]

1689 [T5]

1689-1 [T4]

1690 [T3]

1691 [T3]

1695 [T5]

1701 [T5]

1702 [T5]

1703 [T3]

1706 [T3]

1713 [T3]

1714 [T5]

1718 [T3]

1719 [T3]

1720 [T5]

1720-1 [T5]

1722 [T5]

1728 [T3]

1740 [T3]

1741 [T5]

1741-1 [T3]

1742 [T3]

1743 [T3]

1755 [T5]

1759 [T5]

1760 [T3]

1761 [T5]

1765 [T3]

1766 [T3]

1767 [T3]

1768 [T3]

1769 [T5]

1769-1 [T3]

1773 [T3]

1774 [T5]

1775 [T3]

1777 [T3]

1780 [T5]

1783 [T5]

1783-1 [T4]

1787 [T3]

1798 [T3]

1808 [T3]

1810 [T3]

0 Except for Code Cases pertaining to high-temperature gas-cooled reactors; certain requirements in Section III, Division 2, not endorsed by the NRC; Section III, Division 2; and liquid metal.

0 Publicly available NRC published documents are available electronically through the NRC Library on the NRC’s public Web site at: http://www.nrc.gov/reading-rm/doc-collections/. The documents can also be viewed on-line or printed for a fee in the NRC’s Public Document Room (PDR) at 11555 Rockville Pike, Rockville, MD; the mailing address is USNRC PDR, Washington, DC 20555; telephone 301-415-4737 or (800) 397-4209; fax (301) 415-3548; and e-mail pdr.resource@nrc.gov. 

0 Copies may be purchased from the American Society of Mechanical Engineers, Three Park Avenue, New York, NY 10016-5990; phone (212) 591-8500; fax (212) 591-8501; www.asme.org.

0 The Paperwork Reduction Act of 1995 (44 U.S.C. 3501 et seq.) is available electronically through the Federal Register Web site administered by the U.S. National Archives and Records Administration, at http://www.archives.gov/ federal-register/laws/paperwork-reduction/

0 Copies of ASTM standards may be purchased from the American Society for Testing and Materials, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, Pennsylvania 19428-2959; phone (610) 832-9585. Purchase information is available through the ASTM Web site at http://www.astm.org.

Written suggestions regarding this guide or development of new guides may be submitted through the NRC’s public Web site under the Regulatory Guides document collection of the NRC Library at http://www.nrc.gov/reading-rm/doc-collections/reg-guides/contactus.html.

Electronic copies of this regulatory guide, previous versions of this guide, and other recently issued guides are available through the NRC’s public Web site under the Regulatory Guides document collection of the NRC Library at http://www.nrc.gov/reading-rm/doc-collections/. The regulatory guide is also available through the NRC’s Agencywide Documents Access and Management System (ADAMS) at http://www.nrc.gov/reading-rm/adams.html, under ADAMS Accession No. ML16321A335. The regulatory basis for this guide is the regulatory analysis prepared for the amendment to 10 CFR 50.55a (ADAMS Accession No. ML16285A013. The staff responses to the public comments on DG‑1295 may be found under ADAMS Accession No. ML16285A012.