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:
19-27 111.3 Element 3: basis of determination regarding the cause of the degradation (whether it is generic, age-related, etc.). Reviewers should evaluate if 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 better 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 benefits from the implementation and monitoring programs should be balanced against any negative impact on risk. Finally, reviewers should consider the criteria to be applied in deciding what actions are to be taken in cases where performance falls below that predicted by the supporting evaluations. Corrective action procedures should be in place before implementation of the proposed program. 111.4 Element 4: Conduct Staff Evaluation of Submittal In order for the staff to reach a conclusion regarding the acceptability of the proposed LB change on the basis of the review guidance presented in earlier sections, the licensee must submit or make available sufficient engineering and licensing information. In addition, the licensee should request appropriate regulatory action. Requests for proposed changes to the plant's LB typically take the form of requests for license amendments (including