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:
REVIEW RESPONSIBILITIES Primary: Materials and Chemical Engineering Branch (EMCB) Secondary: Probabilistic Safety Assessment Branch (SPSB) I. AREAS OF REVIEW The purpose of this SRP is to describe the procedure that the NRC staff will use to review risk- informed inservice inspection (RI-ISI) programs for piping that are different from the current ISI programs at a nuclear power facility. In implementing risk-informed decisionmaking, the licensee must ensure that any proposed change to the ISI program or the regulation meets the following key principles: 1. The proposed change meets the current regulations unless it is explicitly related to the request for alternatives under 10 CFR 50.55a(a)(3) or a requested exemption or rule change, i.e., a "specific exemption" under 10 CFR 50.12 or a "petition for rulemaking" under 10 CFR 2.802. 2. The proposed change is consistent with the defense-in-depth philosophy. 3. The proposed change maintains sufficient safety margins. 4. When proposed changes result in an increase in core damage frequency or risk, the increases should be small and consistent with the intent of the Commission’s Safety Goal Policy Statement. 5. The impact of the proposed change should be monitored using performance measurement strategies. Each of these principles should be considered in the risk-informed, integrated decisionmaking process. Given these principles of risk-informed decisionmaking, the staff has identified a four- element approach that forms the basis for evaluating proposed changes to a plant’s ISI program based on risk-informed methods. These are: define the change, perform an engineering analysis, define the implementation and monitoring program, and submit the proposed change. The first element involves the characterization of 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