Document: NRC Regulatory Guide
Document ID: 6f84e3bf-9ff3-49fb-a16a-0de3b89e6bc6
Document Type: regulatory_guide
Title: An Approach for Plant-Specific Risk-Informed Decisionmaking for Inservice Inspection of Piping (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2103/ML21036A105.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.178
CFR Part: 
CFR Title: 

Content:
or risk neutral. The change is evaluated and compared with the guidelines presented in RG 1.174. The staff expects that the RI-ISI program would lead to both risk reduction and reduction in radiation exposure to plant personnel. The change in risk estimate should appropriately account for the change in the number of elements inspected and the effects of enhanced inspection. The methods used to determine the piping failure potential, the piping failure consequence, and the impact of the change in the number of inspections should together provide confidence that any increase in risk is small and acceptable in accordance with RG 1.174 guidelines and consistent with the intent of the Commission’s safety goal policy statement. 2.3 Integrated Decisionmaking Sections C.2.1 and C.2.2 address the elements of engineering analysis and PRA analysis of an RI-ISI program. These elements are part of an integrated decisionmaking process that assesses the acceptability of the program. The key principles of RG 1.174 are systematically addressed. Technical and operations personnel at the plant review the information and render a finding of the safety-significance category for each piping segment under review. Detailed guidelines for the categorization of piping segments should be developed and discussed with the group responsible for the determination (typically performed by the plant’s expert panel). The method for selecting the number of piping elements to be inspected should be justified. 3. Element 3: Implementation, Performance Monitoring, and Corrective Action Strategies Integrating the information obtained from Elements 1 and 2 of the RI-ISI process (as described in Sections C.1 and C.2 of this guide), the licensee develops proposed RI-ISI implementation, performance monitoring, and corrective action strategies. The RI-ISI program should identify piping segments whose inspection strategy (i.e., frequency, number of inspections, methods, or all three) should be increased,