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:
e under the guidelines of the peer review process. The choice of a specific assumption or a particular approximation may influence the results of the PRA. For each application that calls upon this RG, the assumptions and approximations relevant to that application and those that are key to that application (see definitions of: “assumption,” “key assumption,” and “key source of uncertainty” in the Glossary of this RG) are identified. The key assumptions for a PRA application are generally identified from the assumptions and approximations identified in the base PRA. The identified key assumptions are used to identify sensitivity studies as input to the decision-making associated with the application. When a key assumption is shown to be consistent with a consensus method or approach, that key assumption may no longer be subject to additional sensitivity studies in the context of a PRA application. Appendices A, B, and C to this RG either identifies the need for or directly relates to (in the case of the industry peer review process) a peer review. One of the functions of the peer review is to assess the assumptions and make judgments as to their appropriateness. 4. Documentation to Support a Regulatory Decision The licensee develops documentation of the PRA model and the analyses performed to support the risk-informed regulatory activity. This documentation comprises both archival (i.e., available for audit or inspection) and submittal (i.e., submitted as part of the risk-informed request) documentation. The former may be required on an as needed basis to facilitate the NRC staff’s review of the risk-informed submittal. The results of a PRA are sometimes used to support a decision changing a regulatory activity that is made by the licensee as authorized by a previous licensing decisions. Generally, all such authorizations have an associated PRA configuration control process that is part of the amendment authorizing the use of a PRA. The licensee follows