Document: NRC Regulatory Guide
Document ID: 22ccfd5e-c5d8-4615-a02c-32369aa9f533
Document Type: regulatory_guide
Title: Acceptability of Probabilistic Risk Assessment Results for Risk-Informed Activities (Rev. 3)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1930/ML19308B636.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.200
CFR Part: 
CFR Title: 

Content:
0 provides guidance for developing an acceptable PRA-based SMA. • DC/COL-ISG-028, “Interim Staff Guidance on Assessing the Technical Adequacy of the Advanced Light-Water Reactor Probabilistic Risk Assessment for the Design Certification Application and Combined License Application” (Ref. 20). This guidance is needed because the ASME and American Nuclear Society (ANS) PRA standard ASME/ANS RA-Sa-2009, “Standard for Level 1/Large Early Release Frequency Probabilistic Risk Assessment for Nuclear Power Plant Applications” (Ref. 21), was developed for currently operating reactors. As a result, for PRAs developed for the DC and COL application stages, some supporting requirements in the ASME/ANS Level 1/Large Early Release Frequency (LERF) PRA Standard are not applicable or cannot be achieved as written, while other supporting requirements need some clarification to understand how they can be achieved. The staff position on the acceptability of PRA for advanced LWR applicants under 10 CFR Part 52 is currently under revision. DC/COL-ISG-028 provides guidance to DC and COL applicants that supplements the endorsement of ASME/ANS RA-Sa-2009 provided in Appendix A of this regulatory guide. Purpose of Regulatory Guides The NRC issues RGs to describe to the public methods that the staff considers acceptable for use in implementing specific parts of the agency’s regulations, to explain techniques that the staff uses in evaluating specific problems or postulated events, and to provide guidance to applicants. RGs are not substitutes for regulations and compliance with them is not required. Methods and solutions that differ from those set forth in RGs will be deemed acceptable if they provide a sufficient basis for the findings required for the issuance or continuance of a permit or license by the Commission. Paperwork Reduction Act This RG provides voluntary guidance for implementing the mandatory information collections in 10 CFR Parts 50 and 52 that are subject to the