Document: NRC Regulatory Guide
Document ID: 1bd47be4-b79c-4108-b744-3e7d400266e8
Document Type: regulatory_guide
Title: ASME Code Cases Approved for Use Without Conditions (Rev. 0)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2509/ML25091A013.pdf
Revision Date: 2025-09
Chapter: 
Section ID: RG-1.262
CFR Part: 
CFR Title: 

Content:
list the code cases addressed by this RG: (1) Table 1, “Acceptable Section III Code Cases,” contains Section III code cases that are acceptable for use by applicants and licensees for Section III construction. (2) Table 2, “Acceptable Section XI Code Cases,” contains Section XI code cases that are acceptable for use by licensees in their Section XI ISI programs. (3) Table 3, “Acceptable OM Code Cases,” contains OM code cases that are acceptable for use by licensees in their IST programs. RG 1.262, Page 7 1. Acceptable Section III Code Cases The NRC determined that the Section III code cases listed in table 1 are acceptable for use by applicants and licensees for Section III construction. To assist users, new or newly revised code cases are shaded in grey to distinguish them from those listed in previous versions of this guide. Users should be aware that a code case approved in this RG may be a more recent version of a code case previously approved in RG 1.84. Applicants and licensees are required to follow 10 CFR 50.55a(b)(4) when applying ASME BPV Section III code cases. The third column of table 1 lists the supplement and edition in which each code case was published (e.g., “5/2017E” means Supplement 5 to the 2017 Edition of the ASME BPV Code). The NRC will update this table in the future as additional code cases are determined to be appropriate for this RG. CODE CASE NUMBER TITLE SUPPLEMENT/ EDITION N-637-2 Use of 44Fe-25Ni-21Cr-Mo (Alloy UNS N08904) Plate, Bar, Fittings, Welded Pipe, and Welded Tube, Classes 2 and 3 4/2021E N-801-4 Rules for Repair of N-Stamped Class 1, 2, 3, and MC Components 0/2023E N-928 Use of ASTM A508/A508M in Lieu of SA-508 0/2023E N-931 Performance and Qualification Criteria for Mitigation of Stress Corrosion Cracking by Surface Stress Improvement 0/2023E N-933 Materials Exempted from Stress-Rupture Test 2/2023E Table 1. Acceptable Section III Code Cases RG 1.262, Page 8 2. Acceptable Section XI Code Cases The NRC