Document: NRC Regulatory Guide
Document ID: c7a40fcc-fc9d-4eb2-ad86-f9f5b0f04c82
Document Type: regulatory_guide
Title: Plant-Specific, Risk-Informed Decisionmaking:  Technical Specifications (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1920/ML19206A489.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.177
CFR Part: 
CFR Title: 

Content:
The uncertainty associated with the two measures being compared can differ and should be considered in deciding on an acceptable change. b. When the risk measures associated with all alternatives are unacceptably large, ways to reduce the risk should be explored instead of only extending the TS requirement. That is, a large risk from one of the alternatives should not justify relaxing TS without giving appropriate attention to risk-reduction options. If the risk from test-caused transients is large, attention may then be given to exploring changes in test procedures to reduce such risk, rather than only reducing the SF. However, a combination of the two also may be appropriate. 2.6 Integrated Decisionmaking In accordance with Regulatory Position C.2.6 of RG 1.174, the results of the evaluations under Sections C.1, C.2, and C.3 should be considered in an integrated manner to determine the final acceptability of the proposed TS change. The comparison of PRA results to numerical acceptance guidelines are considered along with other deterministic considerations, operating experience, lessons learned from previous changes, practical considerations associated with test and maintenance practices, and the implementation and monitoring program. The final acceptability of the proposed TS change should be based on all these considerations and not solely on the numerical results of the PRA. These results are one input into the decisionmaking and help in building an overall picture of the risk implications of the proposed TS 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 change satisfies rules and regulations that are in effect, practical considerations judge the acceptability of implementing the change, lessons learned from past experience ensure that mistakes are not repeated, and monitoring ensures the TS change does not degrade