Document: NRC Regulatory Guide
Document ID: cde52d5a-adf9-49be-9d1f-59449dfca895
Document Type: regulatory_guide
Title: TRIAL - Acceptability of Probabilistic Risk Assessment Results for Non-Light Water Reactor Risk-Informed Activities
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2123/ML21235A008.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.247
CFR Part: 
CFR Title: 

Content:
U.S. NUCLEAR REGULATORY COMMISSION REGULATORY GUIDE 1.247 (For Trial Use) Issue Date: March 2022 Technical Lead: Michelle Gonzalez Written suggestions regarding this guide or development of new guides may be submitted through the NRC’s public Web site in the NRC Library at https://nrc.gov/reading-rm/doc-collections/reg-guides/, under Document Collections, in Regulatory Guides, at https://nrc.gov/reading-rm/doc- collections/reg-guides/contactus.html. Electronic copies of this RG, and other recently issued guides are also available through the NRC’s public Web site in the NRC Library at https://nrc.gov/reading-rm/doc-collections/reg-guides/, under Document Collections, in Regulatory Guides. This RG is also available through the NRC’s Agencywide Documents Access and Management System (ADAMS) at http://nrc.gov/reading-rm/adams.html, under ADAMS Accession Number (No.) ML21235A008. The regulatory analysis may be found in ADAMS under Accession No. ML21235A010. ACCEPTABILITY OF PROBABILISTIC RISK ASSESSMENT RESULTS FOR NON-LIGHT-WATER REACTOR RISK- INFORMED ACTIVITIES A. INTRODUCTION Purpose This trial regulatory guide (RG) describes one acceptable approach that the U.S. Nuclear Regulatory Commission (NRC) staff has developed for determining whether a design-specific or plant- specific probabilistic risk assessment (PRA) used to support an application is sufficient to provide confidence in the results, such that the PRA can be used in regulatory decision-making for non-light- water reactors (NLWRs). In this RG, the term “application” includes initial licensing applications and risk-informed applications. When used in support of an application, this RG will help reduce the need for an in-depth review of the PRA by the NRC and allow them to focus their review on key assumptions and areas identified as being of concern and relevant to the application and the demonstration of PRA acceptability. The purpose of a trial RG is to allow adequate experience to be gained