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:
e elements are performed may vary, or they may occur in parallel, depending on the particular application and the preference of the program developers. The process is highly iterative. Thus, the final description of the proposed change to the ISI program as defined in Element 1 depends on both the analysis performed in Element 2 and the definition of the implementation of the ISI program performed in Element 3. While ISI is, by its nature, an inspection and monitoring program, it should be noted that the monitoring referred to in Element 3 is associated with making sure that the assumptions made about the impact of the changes to the ISI program are not invalidated. For example, if the inspection intervals are based on an allowable margin to failure, the monitoring is performed to make sure that these margins are not eroded. Element 4 involves preparing the documentation to be submitted to the NRC and to be maintained by the licensee for later reference. This section provides detailed descriptions of the methods, approaches, or data that the staff considers acceptable for meeting the requirements of the applicable regulations cited in the introduction to this guide. 1. Element 1: Define the Proposed Change 1.1 Description of Proposed Change The licensee should prepare a full description of the proposed changes to the ISI program. This description should do the following: a. Identify the elements of the ISI program to be changed. RG 1.178, Page 10 b. Identify the piping in the plant that is both directly and indirectly involved with the proposed changes. Identify and appropriately address any piping not presently covered in the plant’s ISI program but categorized as safety significant (e.g., through an integrated decisionmaking process using PRA insights). In addition, 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