Document: NUREG-0800
Document ID: 4e1d86bd-74a5-4678-8bc0-ffce3ba28ea0
Document Type: srp
Title: RISK-INFORMED INSERVICE TESTING
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0428/ML042880272.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.7
CFR Part: 
CFR Title: 

Content:
be specifically approved by the NRC. 3.9.7-1 3 Rev. 0-August 1998 The licensee should increase the test interval for components in a step-wise manner (i.e., equal or successively smaller steps, not to exceed one refueling cycle per step). If no significant time-dependent failures occur, then the interval can be gradually extended until the component is tested at the maximum proposed extended test interval. An acceptable approach is to group similar components and test them on a staggered basis. Initially, it would be desirable to test at least one component in each group every refueling outage. Guidance on grouping components is contained in NRC Generic Letter 89-04, Position 2 for check valves (Ref. 5); Supplement 6 to NRC Generic Letter 89-10 for motor-operated valves (Ref. 6); or other documents endorsed by the NRC. 2. Performance Monitoring of IST Component Monitoring programs should be proposed that are capable of adequately tracking the performance of components that, when degraded, could alter the conclusions that were key to supporting the acceptance of the RI-IST program. Monitoring programs should be structured such that components are monitored commensurate with their safety significance. This allows for a reduced level of monitoring of components categorized as having low safety significance (LSSC) provided the guidance below is still met. The acceptance guidelines for this item consist of evaluating the licensee's proposed performance monitoring process to ensure that it has the following attributes: * Enough tests are included to provide meaningful data, * The test is devised such that incipient degradation can reasonably be expected to be detected, and * The licensee trends appropriate parameters as required by the ASME Code or ASME Code Case and as necessary to provide reasonable assurance that the component will remain operable over the test interval. Assurance must be established that degradation is not significant for components that are placed on