Document: NRC Regulatory Guide
Document ID: 47b09be1-4bf8-45f9-a099-7fed871c09bd
Document Type: regulatory_guide
Title: Plant-Specific, Risk-Informed Decisionmaking: Inservice Testing (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2114/ML21140A055.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.175
CFR Part: 
CFR Title: 

Content:
that are not presently covered in the plant’s IST program but are determined to be important to safety (e.g., through PRA insights), and the particular systems that would be affected by the proposed changes. This information will aid in planning the supporting engineering analyses. RG 1.175, Page 10 • Identify the information that will be used in support of the changes to the IST program, including performance data, deterministic engineering analyses, and PRA information. • Provide a brief statement describing how the proposed changes to the IST program meet the objectives of the Commission’s policy statement on the increased use of PRA in regulatory matters. 1.2 Inservice Testing Program Scope IST requirements for certain safety-related pumps and valves are specified in 10 CFR 50.55a. These components are to be tested according to the requirements of the applicable OM Code. The licensee’s RI-IST program should include all components in the current OM Code-prescribed IST program. In addition, the RI-IST program should include those non-Code components that the licensee’s integrated decisionmaking process categorized as HSSC. 1.3 Risk-Informed Inservice Testing Program Changes After Initial Approval This section provides guidance on RI-IST program changes. The licensee should describe the proposed changes to any previously approved RI-IST programs in the alternative request. The licensee should implement a process for determining when proposed RI-IST program changes require authorization as a new 10 CFR 50.55a(z)(1) alternative. Changes made to the authorized RI-IST program that could affect the process and results reviewed and authorized by the NRC staff should be evaluated to ensure that the basis for the NRC staff’s authorization has not been compromised. All changes should be evaluated against the change mechanisms in accordance with the regulations (e.g., 10 CFR 50.55a, 10 CFR 50.59) to determine whether NRC review and authorization as a new 10 CFR