Document: NUREG-0800
Document ID: 7916b088-fb90-4163-84fe-027bd315bcc5
Document Type: srp
Title: REVIEW OF RISK INFORMATION USED TO SUPPORT PERMANENT PLANT-
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0717/ML071700658.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.2
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Content:
uidance on the use of PRA in risk-informed regulatory applications as documented in Regulatory Guide 1.174 as well as the relevant industry guidance documented by the Electric Power Research Institute (EPRI) in its "Probabilistic Safety Assessment (PSA) Applications Guide." In addition, this section references other SRP sections that provide additional guidance for reviewing specific applications of PRA in regulated activities. The appendices to this SRP section provide more specific guidance. Included are Appendix A, “Guidance for a Focused-Scope Application-Specific PRA Review”; Appendix B, “Integrated Decisionmaking”; Appendix C, “Categorization of Plant Elements with Respect to Safety Significance”; and Appendix D, “Use of Risk Information in Review of Non-Risk-Informed License Amendment Requests.” In the process of risk-informed decisionmaking, the NRC will rely on the approach discussed in this SRP section. Above all, the design, construction, and operational practices of each plant are expected to be consistent with its licensing basis (LB). In addition, the risk evaluations performed to justify regulatory changes are expected to realistically reflect these plant-specific design, construction, and operational practices. The PRA analyses should be as realistic as practicable and, when interpreting the results of those analyses, the reviewers should account for the impact of the most significant uncertainties. The results of these risk analyses will then form part of the input to the decisionmaking process that evaluates the margin in plant capability (in both performance and redundancy/diversity). Specifically, the decisionmaking process will use the results of the risk analyses in a manner that complements traditional engineering approaches, supports the defense-in-depth philosophy, and preserves safety margins. Thus, risk analysis will inform, but it will not determine regulatory decisions. The NRC's PRA Implementation Plan as proposed in