Document: NRC Regulatory Guide
Document ID: a1541707-8144-409c-8842-4ea7d4b8ef4e
Document Type: regulatory_guide
Title: 10/2019 (Rev. 19)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1912/ML19128A244.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.147
CFR Part: 
CFR Title: 

Content:
m Supplement 11 to the 2007 Edition and Supplements 0 through 10 to the 2010 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 in nuclear power plants. Among other things, ASME standards committees develop improved methods for the construction and inservice inspection (ISI) of ASME Class 1, 2, 3, MC, and CC nuclear power plant components. A broad spectrum of stakeholders participates in the ASME process to help ensure consideration of the various interests. ASME publishes a new edition of the BPV Code, which includes Section XI, every 2 years. In 10 CFR 50.55a(a)(1)(ii), the NRC references the latest edition of Section XI, that the agency has approved for use. ASME also publishes Code Cases quarterly. Code Cases provide alternatives developed and approved by ASME. This RG identifies the Code Cases that the NRC has determined to be acceptable alternatives to applicable parts of Section XI. Under 10 CFR 50.55a(z), a licensee or applicant may use Section XI Code Cases that the NRC has not yet endorsed. In 10 CFR 50.55a(z), the NRC 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 their use is authorized by the Director of the Office of Nuclear Reactor Regulation. The NRC incorporated the ASME BPV Code by reference into 10 CFR 50.55a. NRC-approved Code Cases provide an acceptable voluntary alternative to the mandatory ASME Code provisions. The regulation at 10 CFR 50.55a(b)(5) provides requirements related to the implementation of ASME Section XI Code Cases. When a licensee initially applies a Code Case listed in Tables 1 or 2 of this guide, it must implement the most recent version of that Code Case incorporated by reference in