Document: NUREG-0800
Document ID: 7f6b0af0-d79e-4704-9eac-aa03109a7731
Document Type: srp
Title: RISK-INFORMED DECISIONMAKING: TECHNICAL SPECIFICATIONS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0425/ML042520260.pdf
Revision Date: 2023-06
Chapter: 16
Section ID: 16.1
CFR Part: 
CFR Title: 

Content:
ll depend on several factors: a) The emphasis placed on traditional analysis as opposed to PRA in establishing the basis for the TS change. If the justification for the change is based on well founded traditional arguments that are easily supported by PRA insights, then only a limited PRA review may be warranted. However, if a TS change is primarily being supported by complex PRA arguments with a limited traditional basis, then the breadth and depth of the PRA review will be substantially greater. b) The safety significance of the structure, system or component under consideration. The level of redundancy, diversity and need for operator recovery actions will impact the safety significance of any proposed TS change. The reliance on operator actions to perform a safety function under high stress conditions will, for example, require greater scrutiny of the human reliability analysis than of automatic systems. c) The validity of the PRA. An initial evaluation of the PRA will be needed to obtain a degree of confidence in the validity of the PRA. The necessary level of confidence will depend on the application. Validity of the PRA with respect to the decision making process can be established by evaluating: i) consistency of the PRA methodology with acceptable methods and practices ii) robustness of the results through sensitivity studies iii) consistency of the PRA findings with respect to the plant's design and operational characteristics iv) modeling detail and scope necessary to support the decision making activity v) representation of the as-built, as-operated plant vi) discussion of peer review, industry certification, or cross-comparisons presented by the licensee as evidence of PRA quality "- Rev. 0 - August 1998 SRP 16.1-16 d) The consistency of the TS change to other TS proposals approved by the NRC. If there is a baseline for approving similar TS changes for similar type plants, then only differences between previously accepted submittals and the one under