Document: NUREG-0800
Document ID: 32179098-f78d-4852-9c29-1e5e3abb2705
Document Type: srp
Title: RISK-INFORMED DECISION MAKING:  TECHNICAL SPECIFICATIONS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0703/ML070380228.pdf
Revision Date: 2023-06
Chapter: 16
Section ID: 16.1
CFR Part: 
CFR Title: 

Content:
Implementation and Monitoring Program A. Three Tiered Implementation Approach. As described in subsection IlI.2.B of this SRP section, the staff expects the licensee to use a three-tiered approach in evaluating the risk of proposed TS changes. Application of the three-tiered approach is in keeping with the fundamental principle that the proposed change is consistent with the defense-in-depth philosophy. Application of the three-tiered approach provides assurance that defense in depth is not impacted significantly by the proposed change. B. Maintenance Rule Control. To prevent extension of a TS AOT or STI from degrading operational safety over time, when an SSC does not meet performance criteria, the licensee should include prior related TS changes in the scope of its evaluation required under the Maintenance Rule (10 CFR 50.65) (Reference 20). If the licensee concludes that the performance or condition of a 16.1-17 Revision 1 - March 2007 TS system or component affected by a TS change does not meet established performance criteria, it should take appropriate corrective action under the Maintenance Rule, including another TS change to shorten the revised AOT or STI or a more restrictive administrative limit if such factors are important in reversing the negative trend. 4. Submit Proposed Change The evaluations justifying the proposed TS changes should be documented in the license amendment request. The documentation should include: A. A description of the TS changes proposed and the reasons for the changes. B. A description of the process for arriving at the proposed changes. C. Traditional engineering evaluations performed. D. Changes made to the PRA for the TS change evaluation. E. Review of the applicability and quality of the PRA models for TS evaluations. F. Description of the risk measures in evaluating the changes. G. Data in addition to the plant PRA database. H. Summary of the calculated risk measures including intermediate results. I. Sensitivity and