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:
II and Section XI, and the OM Code that the agency has approved for incorporation by reference into the CFR. ASME also publishes code cases for BPV Code, Section III and Section XI, quarterly and code cases for the OM Code periodically. Code cases provide alternatives to the ASME BPV and OM Code provisions developed and approved by ASME. In previous rulemakings for ASME code cases, the NRC incorporated by reference revisions of three RGs (RGs 1.84, 1.147, and 1.192) identifying ASME code cases that the NRC finds acceptable or conditionally acceptable for use. The NRC incorporates by reference this RG identifying ASME code cases that the NRC has determined to be unconditionally acceptable for use. This RG supplements RGs 1.84, 1.147, and 1.192 by providing additional code cases that are acceptable for use. The NRC will also continue to update and incorporate by reference RGs 1.84, 1.147, and 1.192 on a recurring basis. Background Applicants or licensees may voluntarily use code cases approved by the NRC as an alternative to compliance with the ASME BPV and OM Code provisions as incorporated by reference into 10 CFR 50.55a. The regulations in 10 CFR 50.55a(b)(4), (b)(5), and (b)(6) provide requirements related to the implementation of ASME BPV Code, Section III and Section XI, code cases and the OM code cases. Licensees may implement ASME code cases in their inservice testing (IST) programs according to the requirements in 10 CFR 50.55a(f)(4)(i) and (ii). Similarly, licensees may implement ASME code cases in their inservice inspection (ISI) programs according to the requirements in 10 CFR 50.55a(g)(4)(i) and (ii). Applicants or licensees may submit a request to use code cases that the NRC has not listed in an RG incorporated by reference into 10 CFR 50.55a through proposed alternatives in 10 CFR 50.55a(z) or specific exemptions in 10 CFR 50.12, “Specific Exemptions,” as applicable. ASME may annul a code case because its provisions have been incorporated into the