Document: NRC Regulatory Guide
Document ID: 47b09be1-4bf8-45f9-a099-7fed871c09bd
Document Type: regulatory_guide
Title: Plant-Specific, Risk-Informed Decisionmaking: Inservice Testing (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2114/ML21140A055.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.175
CFR Part: 
CFR Title: 

Content:
am with existing programs for monitoring equipment performance and other operating experience at their sites and, when appropriate, throughout the industry. In particular, monitoring performed as part of Maintenance Rule (10 CFR 50.65) implementation can be credited in the RI-IST program when the monitoring performed under the Maintenance Rule is sufficient for the SSCs in the RI-IST program. As stated in RG 1.174, if an application requires monitoring of SSCs not covered by the Maintenance Rule, or involves SSCs that need a greater resolution of monitoring than specified in the Maintenance Rule (e.g., component-level versus train- or plant-level monitoring), it may be advantageous for a licensee to adjust the Maintenance Rule monitoring program rather than develop additional monitoring programs for RI-IST purposes. Therefore, it may be advantageous to adjust the performance criteria within the licensee’s Maintenance Rule program to meet the guidance below. The proposed monitoring programs should be capable of adequately tracking the performance of equipment that, when degraded, could alter the conclusions that were key to supporting the RI-IST program. Monitoring programs should be structured such that SSCs are monitored commensurate with their safety significance. This allows for a reduced level of monitoring of components categorized as having low safety significance, provided the guidance below is still met. The licensee’s performance monitoring process should have the following attributes: a. The process includes enough tests to provide meaningful data. b. These tests are devised such that incipient degradation can reasonably be expected to be detected. c. The licensee trends appropriate parameters as necessary to provide reasonable assurance that the component will remain operable over the test interval. Assurance should be established that degradation is not significant for components placed on an extended test interval, and that failure rate assumptions