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:
TS change should ensure that the guidance contained in Regulatory Position 2.3.4 of Regulatory Guide 1.177 is met. g) Sensitivity and Uncertainty Analyses The review of any sensitivity and uncertainty analyses used in evaluating a TS change should ensure that the guidance contained in Regulatory Position 2.3.5 of Regulatory Guide 1.177 is met. C. Define Implementation and Monitoring Program 1. Three-Tiered Implementation Approach As described in Section 1lI.B.2, the staff expects the licensee to use a three-tiered approach in evaluating the risk associated with 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 will not be significantly impacted by the proposed change. 2. Maintenance Rule Control To ensure that extension of a TS AOT or STI does not degrade operational safety over time, the licensee should ensure, as part of its Maintenance Rule program (10 CFR 50.65) (Ref. 20), that when an SSC does not meet its performance criteria, the evaluation required under the Maintenance Rule includes prior related TS changes in its scope. If the licensee concludes that the performance or condition of a TS system or component affected by a TS change does not meet established performance criteria, appropriate corrective action should be taken, in accordance with the Maintenance Rule. Such corrective action could include consideration of another TS change to shorten the revised AOT or STI, or imposition of a more restrictive administrative limit, if the licensee determines this is an important factor in reversing the negative trend. SRP 16.1-19 Rev. 0 - August 1998 D. Submit Proposed Change The evaluations performed to justify the proposed TS changes should be documented and included in the license amendment request submittal. The documentation should include the