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:
n, identify the particular systems that are affected by the proposed changes, since this information is an aid in planning the supporting engineering analyses. c. Identify the information that will be used to support the changes. This could include performance data, deterministic engineering analyses, and PRA information. d. Include a brief statement describing how the proposed changes meet the intent of the Commission’s PRA policy statement. 1.2 Changes to Approved Risk-Informed Inservice Inspection Programs This section provides guidance on the need for licensees to report program activities and guidance for the formal NRC review of changes made to RI-ISI programs. The licensee should implement a process for determining when RI-ISI program changes require formal NRC review and approval. It should evaluate the changes made to the NRC-approved RI-ISI program that could affect the process and results reviewed and approved by the NRC staff to ensure that the basis for the staff’s approval has not been compromised. The licensee should evaluate all changes using the change mechanisms described in the applicable regulations (e.g., 10 CFR 50.55a, 10 CFR 50.59) to determine whether they require NRC review and approval before implementation. If there is a question on this issue, the licensee should seek NRC review and approval before implementation. 2. Element 2: Perform Engineering Analysis As part of defining the proposed change to its ISI program, the licensee should conduct an engineering evaluation of the proposed change, using and integrating a combination of deterministic engineering methods and PRA. The major objective of this evaluation is to confirm that the proposed program change will not compromise defense in depth, safety margins, and other key principles described in this guide and in RG 1.174. RG 1.174 provides general guidance for performing this evaluation, which is supplemented by the RI-ISI guidance herein. The discussions below summarize the