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:
ence, piping material, degradation mechanisms, and various other parameters are identified and considered is evaluated. There are numerous uncertainties involved in performing an assessment of segment failure potential. The procedures for addressing these uncertainties when predicting failure potential are reviewed. I.2.2.5 Consequences of Failure Direct effects of piping failures include loss of coolant accidents (LOCA) or other flow diversions resulting in an initiator or a consequential loss of systems because of the inability to deliver sufficient flow because of the failed piping. Indirect effects include consequential failures of additional equipment, including equipment in other systems, because of effects such as pipe whip, jet impingement, flooding, or temperature. The procedure by which direct and indirect effects are characterized and documented is reviewed to verify that appropriate failure mechanisms and dependencies will be evaluated in the risk analysis. I.2.2.6 Risk Impact of ISI Changes The methodology used to characterize the change in risk caused by the proposed change in the ISI program is reviewed. Part of the basis for the acceptability of any RI-ISI program is a demonstration that established risk measures are not significantly increased by the proposed reduction in the number of inspections for selected piping. To demonstrate this, the process and methodology used to appropriately account for the change in the number of elements inspected and the effects of an enhanced inspection method are reviewed. I.2.3 Integrated Decisionmaking Acceptability of the impact of the proposed change in the ISI program is determined based on the review of the adequacy of the licensee’s fulfillment of the five key principles as listed in Section I and discussed in detail in Regulatory Guide 1.174. The licensee’s processes, procedures, and decision 3.9.8-6 criteria to integrate, and to iterate on the integration as necessary, the different elements of the