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:
ping that is subject to ISI under ASME B&PVC Section XI requirements but has no segments exceeding the piping segment screening criteria should be further reviewed. Each ASME Class coded system should have some segments inspected for defense-in-depth considerations. The criteria for determining how many structural elements should be selected for inspection should be based on the safety significance of the segment and the failure potential within that segment. The potential for pipe failure directly drives the need for selecting elements for inspection and the location within a segment to be inspected. The sampling program for the selection of the number of elements to be inspected should be fully justified. Guidelines for an acceptable methodology for selection of structural elements for inspection within pipe segments are provided in the Regulatory Guide 1.178. 3.9.8-13 The intent of the ASME B&PVC to maintain integrity of the reactor coolant system boundary by ISI should be preserved under the RI-ISI program. Appropriate consideration should be given to implementation and performance monitoring strategies so that piping performance can be assessed under the proposed ISI program change to confirm the assumptions and analyses that were conducted to justify the ISI program change. II.3 Element 3: Implementation and Monitoring Programs Careful consideration should be given to implementation and performance-monitoring strategies. The primary goal of this element is to assess piping performance under the proposed RI-ISI program by establishing performance-monitoring strategies to confirm the assumptions and analyses that were conducted to justify the changes in the ISI program. As discussed in Regulatory Guide 1.178, performance monitoring encompasses feedback and modification of the RI-ISI program resulting from changes in plant design features, plant procedures, equipment performance, examination results, and individual plant and industry failure information.