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:
roposed change. Therefore, one area of review would be an evaluation of the proposed change in light of the LB (i.e., evaluation of the structures, systems, and components (SSCs), as well as the plant procedures and activities that are affected by the proposed change and how these SSCs, procedures or activities relate to the LB). In addition, an evaluation of the method of analysis and a study of available insights from traditional and probabilistic engineering studies that are relevant to the proposed change would be necessary to determine if the change can be supported. SRP 19-3 Element 2 - Conduct Engineering Evaluations: The licensees' decisionmaking process should factor in the appropriate traditional and probabilistic engineering insights. Reviewers should evaluate the proposed change to ensure that the defense-in-depth philosophy and sufficient safety margins are maintained, and that the calculated change in plant risk is within the guidelines specified in RG 1.174. Reviewers should also verify that insights from the engineering evaluations used to justify a change have been used tco improve operational and engineering decisions where appropriate, and not simply to eliminate requirements the licensee sees as undesirable. * Element 3 - Develop Implementation and Monitoring Strategies: Results from implementation and monitoring strategies can provide an early indication of unanticipated degradation of performance of those plant elements affected by the proposed change. These strategies are therefore important in applications where uncertainty in evaluation models and/or data used to justify the change can change the conclusions of the analysis. As such, the review scope should include provisions to ensure that the licensee has proposed an implementation and monitoring process that is adequate to (in part) account for uncertainties regarding plant performance under the proposed change. Element 4 - Document Evaluations and Submit Request: Reviewers should ensure