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:
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 degradation mechanisms occur. The adequacy of the reliability of the implemented NDE methods should be monitored. The adequacy of NDE performance levels and inspection intervals along with the appropriateness of the selected ISI locations should be considered valid only if the ISI program is successful in detecting degradation before it leads to leakage or rupture of piping. III. REVIEW PROCEDURES The staff reviews the licensee’s proposed RI-ISI program to determine whether it appropriately describes the types of changes that the licensee can make without prior NRC approval and the types of changes that require NRC approval before implementation. The reviewer ensures that all changes are evaluated using the change mechanisms described in existing applicable regulations (e.g., 10 CFR 50.55a, 10 CFR 50.59, and Appendix B to 10 CFR 50 for safety-related structures, systems, and components) to determine whether NRC review and approval is required prior to implementation. Licensees may request a variety of ISI programs supported by various levels of analyses and evaluations. In general, the degree of freedom the licensee receives to make future changes to the ISI program without prior NRC approval depends on the level of sophistication of the plant practices and procedures supporting the change to RI-ISI. Some general guidance on determining which future changes are appropriate is given below.  Changes to segment groupings, inspection intervals, and inspection methods that do not involve a change to the overall RI-ISI approach in which the overall RI-ISI approach was reviewed and approved by the NRC do not require specific review and approval prior to implementation provided that the effect of the changes on plant risk increase is insignificant. The overall ISI submittal