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:
igorously than components categorized as HSSC (e.g., less frequent or informative tests). In some situations, an acceptable test strategy for components categorized HSSC may be to conduct the existing approved code IST test at the code-prescribed frequency. In some situations, an acceptable test strategy for components categorized LSSC may be to conduct the existing approved Code IST test at an extended interval. An acceptable strategy for testing components categorized HSSC and LSSC should be defined in NRC-approved ASME risk-informed Code Cases. Licensees who choose to pursue RI-IST programs should have considered adopting of test strategies developed by ASME and endorsed by the NRC. Deviations from endorsed Code Cases must be reviewed and approved by the NRC staff as part of the RI-IST program review. 3.9.7-7 Rev. 0-August 1998 In establishing the test strategy for components, the licensee should consider component design, service condition, and performance, as well as risk insights. The proposed test strategy should be supported by data that are appropriate for the component. The omission of either generic or plant-specific data should be justified. The proposed test interval should be significantly less than the expected time to failure of the component as assumed in the PRA (e.g., an order of magnitude less)'. In addition, the licensee should demonstrate that adequate component capability margin exists, above that required during design-basis conditions, such that component operating characteristics over time do not result in reaching a point of insufficient margin before the next scheduled test activity. The IST interval should generally not be extended beyond once every 6 years or 3 refueling outages (whichever is longer) without specific compelling documented justification available onsite for review. Extensions beyond 6 years or 3 refueling outages (whichever is longer) will be considered as component performance data at extended intervals is acquired. The