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:
ted 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 components is consistent with the RI-IST process and results reviewed and authorized by the NRC staff. 2. Element 2: Perform Engineering Analysis As part of defining the proposed changes to the licensee’s IST program, the licensee should conduct an engineering evaluation of the proposed change using 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 and other key principles described in this guide. RG 1.174 provides general guidance for the performance of this evaluation, supplemented by this RG. 2.1 Alternative Request To implement an RI-IST program in lieu of the IST program required by the ASME OM Code as incorporated by reference in 10 CFR 50.55a, the licensee must submit an alternative request in accordance with 10 CFR 50.55a(z)(1) to demonstrate that the proposed RI-IST program will provide an acceptable level of quality and safety. In addition, the licensee should determine whether any additional requests need to be submitted in order to implement the proposed RI-IST program, such as license amendment requests, exemption requests, technical specification amendment requests, and other alternative or relief requests. Following NRC authorization of the RI-IST program, the licensee is not required to submit additional requests to adjust the test interval of individual components that are categorized as having low safety significance (because the NRC staff reviewed and authorized the licensee’s implementation plans for extending specific component test intervals as part of the licensee’s RI-IST program submittal). However, licensees will need to submit alternative requests to use the RI-IST program in future 120- month IST program