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:
uthorized alternative to the current NRC-endorsed ASME BPV Code under 10 CFR 50.55a(z)(1). The licensee should also describe how the proposed change impacts any commitments made to the NRC. b. Discuss each of the following five key principles of risk-informed regulations (see Section C.2 of RG 1.174 for more details): (1) The proposed change meets the current regulations unless it is explicitly related to an alternative requested under 10 CFR 50.55a(Z)(1), a requested exemption, or a rule change. (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 risk, the increases should be small and consistent with the guidance in RG 1.174. (5) The impact of the proposed change should be monitored using performance measurement strategies. c. Identify the aspects of the plant’s current requirements that would be affected by the proposed RI-ISI program. This identification should include all commitments and augmented programs (for example, the intergranular stress-corrosion cracking inspections and other commitments arising from generic letters affecting piping integrity) that the licensee intends to change or terminate as part of the RI-ISI program. The application of the RI-ISI methodology to incorporate and change the augmented program should be justified. d. Identify the specific revisions to existing inspection schedules, locations, and methods that would result from implementation of the proposed program. e. Submit plant procedures or documentation containing the guidelines for all phases of evaluating and implementing a change in the ISI program based on probabilistic and deterministic insights. These should include a description of the integrated decisionmaking process and criteria used for categorizing the safety significance of piping segments, a description of how the integrated RG 1.178, Page 24 decisionmaking was performed, a