Document: NUREG-0800
Document ID: b07c8dd1-23f6-41f1-a3ba-aa378f9ea59a
Document Type: srp
Title: RISK-INFORMED INSERVICE INSPECTION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0325/ML032510135.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.8
CFR Part: 
CFR Title: 

Content:
System pressure tests and visual examination of ASME piping structural elements should continue to be performed regardless of whether the segments contain locations that have been classified as safety significant or low safety significant. Safety-significant non-Code piping should be treated as ASME Code Class piping for purposes of examination and pressure testing. The qualifications of nondestructive examination (NDE) personnel, processes, and equipment should be demonstrated to be in compliance with ASME B&PVC Section XI. The acceptance criteria for flaw evaluation should meet the requirements of ASME B&PVC Section XI. For inspections outside the scope of Section XI, the acceptance criteria should meet existing regulatory guidance applicable to those programs. The risk-informed inspection program should specify appropriate inspection intervals consistent with the relevant degradation rate if the data on the degradation mechanism suggest that an inspection interval shorter than that stated in the ASME Section XI is required. In such cases, inspection intervals should be sufficiently short so that degradation too small to be detected during one inspection does not grow to an unacceptable size before the next inspection is performed. 3.9.8-14 Updates to the RI-ISI program should be performed at least on a 10-year interval basis to coincide with the ISI requirements in ASME B&PVC Section XI. Significant changes to the PRA model, plant design feature changes, plant procedure changes, and equipment performance changes should be included for review in the RI-ISI program update if needed to support the update. Leakage, flaws, or indications identified during scheduled RI-ISI program NDE examinations and system pressure tests should be evaluated as part of the RI-ISI program update. Periodic updates of RI-ISI programs should include individual plant as well as industry failure information. Appropriate modifications of the ISI plan should be developed if new or unexpected