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:
PRA acceptability National consensus PRA standards provide one set of minimum requirements that can be met, as endorsed by the staff with exceptions and clarifications, for a base PRA to be considered acceptable. National consensus PRA standards include both technical requirements and process-related requirements such as those related to peer review and PRA configuration control. The PRA peer review process is used to determine whether a base PRA meets the requirements provided in the national consensus PRA standard2. One acceptable approach for performing a peer review of a PRA is to perform an established, NRC-endorsed the peer review process by qualified personnel that documents the results and identifies both strengths and weaknesses of the base PRA. When used in support of an application, the use of this 1 The term PRA acceptability and related phrasings are synonymous with previously used terms such as PRA quality and PRA technical adequacy. The staff is using the term PRA acceptability with respect to the scope, level of detail, conformance with PRA technical elements (i.e., technical adequacy), and plant representation of a PRA as related to the outcome of the NRC staff’s review of a given risk-informed application. For additional information, see DPO-2016-001 (ML17013A015). 2 DC/COL-ISG-028 provides guidance on the use of peer reviews and self-assessments to establish the acceptability of PRAs performed to support DC and COL applications. DG-1362, Page 7 RG will obviate the need for an in-depth review of the base PRA by NRC reviewers, allowing them to focus their review on key assumptions and areas identified by peer reviewers as being of concern and relevant to the application. The acceptability of a base PRA is measured against the base PRA scope, level of detail, conformance with the NRC regulatory position in Section C of this RG, and representation of the modeled plant. This RG provides guidance to licensees on how to meet the regulatory positions in