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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CFR Title: 

Content:
ould include identifying those failure modes for which the failure rate may increase, and those for which detection could become more difficult. Reviewers should then verify that the licensee provided one or more of the following (or similar) justifications: • A qualitative discussion on how the change is consistent with the defense-in-depth philosophy and how the change maintains sufficient safety margins, • A qualitative discussion and historical evidence why these failure modes may be unlikely to occur, • A qualitative engineering discussion on how such failure modes could be detected in a timely fashion, • A discussion on what other requirements may be useful to control such failure rate increases, • A qualitative engineering discussion on why relaxing the requirements may have minimal impact on the failure rate increase. c. Evaluation Findings Reviewers should verify that information provided and review activities conducted support the following conclusions: • The categorization of the SSCs or human actions has adequately captured their significance to safety, and this categorization has been performed in such a way that the potential impact of the proposed application results in, at most, a small increase in the risk to the health and safety of the public. The input to the integrated decisionmaking process derived from importance measures has been utilized, taking into account the known limitations of importance calculations, and the results have been supplemented by appropriate qualitative considerations. 19.2-80 June 2007 • The integrated decisionmaking process explicitly recognized systems invoked in plant response to initiating events and ensured that components within these systems are considered for programmatic attention in areas (IST, ISI, etc.) appropriate to their performance characteristics and the level of performance needed from them. 19.2-81 June 2007 APPENDIX D Use of Risk Information in Review of Non-risk-informed License