Document: NUREG-0800
Document ID: ac43f632-9db1-4857-9f56-bfba45965456
Document Type: srp
Title: * These are modifications to a plant’s design, operations, or other activities that require NRC approval. These modifica
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0232/ML023250195.pdf
Revision Date: 2023-06
Chapter: 19
Section ID: 19
CFR Part: 
CFR Title: 

Content:
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. 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 2 In April 2000, the Nuclear Energy Institute submitted a process (Ref. 8) for peer review of licensee PRAs. It was submitted for staff review in the context of its use in categorizing SSCs with respect to special treatment requirements (i.e., supporting NRC’s risk-informed "Option 2" work (SECY-99-256, Ref. 9)). This process may also be of use in LB changes (as well as other regulatory activities not addressed here); if so, future revisions of this Standard Review Plan chapter may endorse this certification process for this purpose. SRP 19-17 quality of the PRA for each application. At a minimum, reviewers should reach these findings on