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:
ly on the numerical results of the PRA. Numerical PRA results should be just one input into the decisionmaking and help in building an overall picture of the risk RG 1.175, Page 19 implications of the proposed change. As discussed previously, the numerical guidelines are used to ensure that any increase in risk is within acceptable limits, deterministic considerations are used to ensure that the proposed RI-IST program will satisfy the applicable rules and regulations, practical considerations are taken into account to judge the acceptability of proposing an RI-IST program, lessons learned from past experience ensure that mistakes are not repeated, and monitoring ensures that the proposed change will not degrade operational safety over time. RG 1.174, Section C.2.6, provides additional guidance on the integrated decisionmaking process. Furthermore, Section C of RG 1.174 identifies a set of expectations that licensees should follow in addressing the key principles. Because of the importance of these expectations, they are repeated here. a. All safety impacts of the proposed licensing basis changes are evaluated in an integrated manner. The evaluation is part of an overall risk management approach in which the licensee is using risk analysis to improve operational and engineering decisions broadly by identifying and taking advantage of opportunities to reduce risk and not just to eliminate requirements the licensee sees as undesirable. For those cases in which risk increases are proposed, the benefits should be described and should be commensurate with the proposed risk increases. The approach used to identify changes in requirements should also be used to identify areas in which requirements should be increased, as well as those in which they can be reduced. b. The engineering analyses (including deterministic and probabilistic analyses) conducted to justify the proposed licensing basis change should (1) be appropriate for the nature and scope of the change, (2) be