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:
s with 10 CFR Part 50, Appendix B, Criterion XVI, “Corrective Action.” b. It promptly determines the impact of the failure or nonconforming condition on system or train operability and follows the appropriate technical specification when component capability cannot be demonstrated. c. It determines and corrects the apparent or root cause of the failure or nonconforming condition (e.g., improves testing practices, repairs or replaces the component). The root cause of failure should be determined for all components categorized as having high safety significance, as well as for components categorized as having low safety significance when the apparent cause of failure may contribute to CCF. d. It assesses the applicability of the failure or nonconforming condition to other components in the RI-IST program (including any test sample expansion that may be required for grouped components such as relief valves). e. It corrects other susceptible RI-IST components, as necessary. f. It considers the effectiveness of the component’s test strategy in detecting the failure or nonconforming condition. The test interval, test methods, or both, are adjusted as appropriate when the component (or group of components) experiences repeated or age-related failures or nonconforming conditions. The corrective action evaluations should periodically be provided to the licensee’s PRA group so that any necessary model changes and re-grouping are done, as appropriate. The effect of the failures on overall plant risk should be evaluated, and it should be confirmed that the corrective actions taken will restore the plant risk to an acceptable level. The RI-IST program documents should be revised to document any RI-IST program changes resulting from corrective actions taken. The licensee does not need to report the results of the RI-IST corrective actions to the NRC (except as required by specific NRC reporting requirements), but should retain them on-site for inspection. RG 1.175, Page