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:
1.262, Page 10 D. IMPLEMENTATION The purpose of this section is to provide information to applicants and licensees regarding the NRC staff’s plans for using this RG. This RG lists the ASME BPV Code, Section III and Section XI, code cases and the ASME OM code cases that the NRC has approved for use as voluntary alternatives to the mandatory ASME BPV Code provisions incorporated by reference into 10 CFR 50.55a. The requirements addressing implementation of ASME BPV Code, Section III and Section XI, code cases and ASME OM code cases are contained in 10 CFR 50.55a(b)(4), (b)(5), and (b)(6). An applicant’s or a licensee’s voluntary application of an approved code case does not constitute backfitting, inasmuch as there is no imposition of a new requirement or new position. No backfitting is intended or approved in connection with the issuance of this guide. RG 1.262, Page 11 REFERENCES1 1. Code of Federal Regulations (CFR), “Domestic Licensing of Production and Utilization Facilities,” Part 50, Chapter I, Title 10, “Energy.” 2. American Society of Mechanical Engineers (ASME), Boiler and Pressure Vessel Code, Section III, “Rules for Construction of Nuclear Power Plant Components.”2 3. ASME, Operation and Maintenance of Nuclear Power Plants, Division 1, OM Code: Section IST2 4. ASME Boiler and Pressure Vessel Code, Section XI, “Rules for Inservice Inspection of Nuclear Power Plant Components.”2 5. CFR, “Licenses, Certifications, and Approvals for Nuclear Power Plants,” Part 52, Chapter I, Title 10, “Energy.” 6. U.S. Nuclear Regulatory Commission (NRC), Regulatory Guide (RG) 1.84, “Design, Fabrication, and Materials Code Case Acceptability, ASME Section III.” 7. NRC, RG 1.147, “Inservice Inspection Code Case Acceptability, ASME Section XI, Division 1.” 8. NRC, RG 1.192, “Operation and Maintenance Code Case Acceptability, ASME OM Code.” 9. NRC, RG 1.193, “ASME Code Cases Not Approved for Use.” 1 Publicly available NRC published