Document: NUREG-0800
Document ID: e32f0820-4e33-476e-aa36-4ca8c2c64af0
Document Type: srp
Title: Use of Probabilistic Risk Assessment in Plant-Specific, Risk-Informed Decisionmaking:
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0119/ML011940192.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19.0
CFR Part: 
CFR Title: 

Content:
els that served as the basis for the proposed relaxation. SRP 19-16 Review of the PRA Quality Required for an Application The submittal must demonstrate that the licensee's technical analysis is of an appropriate quality. The required PRA quality should be commensurate with the application for which it is applied and the role the PRA results play in the integrated decisionmaking process. The more emphasis that is placed on the risk insights and PRA results in the decisionmaking process, the more requirements have to be placed on the PRA in terms of how well the licensee assesses the risk and/or the change in risk. Emphasis on the PRA review may be reduced if a proposed change to the LB decreases the risk or is risk neutral, or if proposed risk increases are calculated to be very small, or if the decision could be based largely on traditional engineering arguments, or if the licensee proposes compensating measures and/or qualitative factors (such as unquantified benefits) such that it can be convincingly argued that the change improves safety or the risk increase is very small. In assessing the acceptability of a PRA for an application, reviewers should evaluate the licensee's process to ensure quality. In addition, reviewers should reach specific findings regarding the quality of the PRA for each application. At a minimum, reviewers should reach these findings on the basis of a "focused-scope" evaluation that concentrates on application specific attributes of the PRA and on the assumptions and elements of the PRA model that drive the results and conclusions. Appendix A to this SRP chapter provides more detailed guidance regarding several issues that are important to the application-specific reviews of probabilistic evaluations performed as part of risk-informed regulation. The robustness of the results can be determined by developing an understanding of the contributors and the sources of uncertainty that impact the results. For the proposed risk change, reviewers