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:
hould SRP 19-27 ensure that the monitoring proposed is sufficient for the SSCs affected by the risk-informed application and that the performance criteria chosen are appropriate for the application in question. As part of the evaluation of the licensee’s monitoring program, reviewers should assess the proposed provisions for cause determination, trending of degradation and failures, and corrective actions. The program should be structured such that feedback of information and corrective actions is accomplished in a timely manner and degradation in SSC performance is detected and corrected before plant safety can be compromised. In cases when monitoring detects degradation, there should be provisions for a trending and corrective action program, or for the SSCs to be refurbished, replaced, or tested/inspected more often (or a combination of these initiatives). The preferred initiative should be selected on the basis of determination regarding the cause of the degradation (whether it is generic, age-related, etc.). Reviewers should evaluate whether the information gathered during monitoring activities is extensive enough to provide a timely indication of component degradation. Since many components are inherently quite reliable, the limited tests on a limited number of similar components may not provide adequate data, especially for newer plants where aging effects may not be detected until the proposed program is fully in place (and the advantages of a phased implementation are lost). One approach to ameliorate this concern would be to include performance data for similar SSCs at other plants with a range of operating times to expand the applicable database over a range of component ages. Such a program would be expected to improve the chance of early detection of SSC reliability degradation. Reviewers should evaluate the impact on plant risk and SSC functionality, reliability, and availability given the licensee’s proposed implementation and monitoring plan. The