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:
the proposed change. The licensee should identify the aspects of the plant’s licensing bases that may be affected by the proposed change in ISI requirements, including, but not limited to, rules and regulations, final safety analysis report (FSAR), technical specifications, licensing conditions, and licensing commitments. The licensee should also 3.9.8-2 identify all aspects and elements of the ISI program that it intends to modify in future evaluations without prior NRC approval of the change. Piping systems, segments, and welds that are affected by the change in the ISI program should be identified. Plant systems and functions that rely on the affected piping should also be identified. Industry and plant-specific information applicable to the piping degradation mechanisms that characterize the relative effectiveness of past inspections should be documented. As part of the second element, the licensee should evaluate the proposed change with regard to the principles that the proposed change is consistent with the defense-in-depth philosophy, that sufficient margins are maintained, and that proposed increases in core damage frequency (CDF) and risk are small and are consistent with the intent of the Commission’s Safety Goal Policy Statement as discussed in Regulatory Guide 1.174. This element consists of engineering evaluations, including traditional engineering analyses as well as PRAs. The PRA-based assessment of the proposed change should explicitly consider the affected piping segments and assess the impact on the CDF and large early release frequency (LERF) caused by changing the licensee’s current ISI program. The results of the complementary traditional and PRA methods should be used in an integrated decisionmaking process. The third element involves developing implementation and monitoring programs. The primary goal for this element is to assess the performance of piping under the proposed change by establishing performance-monitoring strategies to