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:
ustification 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 documented justification for interval extensions beyond 6 years or 3 refueling outages should be available onsite for review. This is not meant to restrict a licensee from fully implementing NRC-approved component Code Cases. Components categorized HSSC that are not in the licensee's current [ST program should (where practical) be tested in accordance with the NRC-approved ASME risk-informed Code Cases, including compliance with all administrative requirements. When ASME Section Xl or O&M Code testing is not practical, alternative test methods should be developed by the licensee to ensure operational readiness and to detect component degradation (i.e., degradation associated with failure modes identified as being important in the licensee's PRA). As a minimum, a summary of components and proposed testing should be included in the RI- IST program. For components categorized as HSSC that were the subject of a previous NRC-approved relief request (or an NRC-authorized alternative test) the licensee should discuss the appropriateness of the relief in light of the safety significance of the component in their RI-IST program submittal. If practical, IST components (with the exception of certain check valves and relief valves) should, as a minimum, be exercised or operated at least once every refueling cycle. More frequent exercising should be considered for components in any of the following categories, if practical * Components with high risk significance, * Components in adverse or harsh environmental conditions, or * Components with any abnormal characteristics (operational, design, or maintenance conditions). l For example, the MOV exercise requirement (which is comparable to the current stroke time test) should be performed at intervals considerably smaller than the