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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ria relates to, and conforms with, the acceptance guidelines described in Regulatory Guide 1.174. If component level criteria are used, they should be established taking into account the fact that the allowable risk increase associated with the change should be determined on the basis of simultaneous changes to all members of the category. c. Evaluation Findings Reviewers should verify that information provided and review activities conducted support the following conclusions: • The information provided to the integrated decisionmaking process with regard to determining the risk importance of contributors for a specific application is robust in terms of model inputs and assumptions, including issues like the use of both CDF and LERF, completeness of the risk model, and sensitivity of the results to data uncertainties, common cause failure modeling, modeling of human reliability, and truncation limits used. • The categorization addresses the effect of the change on groups of components in a way that is compatible with the risk acceptance guidelines. C.2 Role of Integrated Decisionmaking in Component Categorization a. Areas of Review While probabilistic importance analysis can provide valuable information regarding categorization of SSCs or human actions, it should be supported and supplemented by an evaluation based on traditional engineering considerations. This will require using the qualitative insights obtained from the PRA, and considering the maintenance of the defense-in-depth philosophy and sufficient safety margins. One important element of this integrated decisionmaking can be the use of an "expert panel." This section provides guidelines for reviewing the licensee's integrated decisionmaking process in the area of importance categorization, and it supplements the general guidance in Appendix B to this SRP section. b. Review Guidance and Procedures Identification of Functions, Systems, and Components Important to Safety: The PRA can provide significant