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:
. 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 50.55a(z)(1) alternative request is required before implementation. Licensees can change their RI-IST programs, consistent with the process and results that were reviewed and authorized by the NRC staff (i.e., as defined in the authorized RI-IST program description). Before implementation, licensees should have a process or procedures in place before making such changes to the previously authorized RI-IST program. The cumulative impact of all RI-IST program changes (i.e., initial authorization plus subsequent changes) should be in accordance with Regulatory Position C.2.2.3.3. Examples of changes to RI-IST programs that would require authorization as part of a new 10 CFR 50.55a(z)(1) alternative request include, but are not limited to, the following: a. changes to the RI-IST program that involve programmatic changes (e.g., changes in the acceptance guidelines used for the licensee’s integrated decisionmaking process), and b. component test method changes that deviate from the methods described in the original 10 CFR 50.55a(z)(1) alternative request. Examples of changes to RI-IST programs that would not require NRC review and authorization include, but are not limited to, the following: a. changes to component groupings, test intervals, and test methods that do not involve a change to the overall RI-IST approach reviewed and authorized by the NRC staff; RG 1.175, Page 11 b. component test method changes that involve the implementation of the OM Code of Record for the current 120-month IST program interval or an NRC-approved Code Case in RG 1.192 (Ref. 18) as incorporated by reference in 10 CFR 50.55a; and c. recategorization of components because of experience, PRA insights, or design changes, but not programmatic changes, when the process used to recategorize the