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
CFR Part: 
CFR Title: 

Content:
sing from the licensee's voluntary actions, regulatory requirements, or previous changes made to the LB. • The results and conclusions are "robust" and, where appropriate, the licensee has conducted an analysis of uncertainties and sensitivities to show this robustness. • Key performance elements are appropriately classified, and performance is backed up by licensee actions. PRA results are dependent on plant activities. They reflect not only inherent device characteristics, but also numerous programmatic activities, such as IST, ISI, quality assurance, or maintenance. Use of a PRA to justify relaxation of a requirement should therefore imply a commitment to the important programmatic activities that are needed to maintain performance at the PRA-credited levels that served as the basis for the proposed relaxation. III.2.2.4.1 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. One way for a licensee to demonstrate reasonable assurance of PRA technical adequacy in their base PRA model is by implementing RG