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:
sment should be made of the effect on the FSAR acceptance criteria assuming the plant is in the AOT (i.e., the subject equipment is inoperable) and there are no additional failures. Such an assessment should result in the identification of all situations in which entry into the proposed AOT could result in failure to meet an intended safety function. 3. Need for and Adequacy of Change The licensee has demonstrated that the change is needed and will ensure adequate reliability and availability of significant safety systems. 4. Justification The licensee has provided the justification for the change based on the guidance in Section I1I.A. B. Probabilistic Guidelines The guidelines discussed in Sections 2.2.4 and 2.2.5 of Regulatory Guide 1.174, "An Approach for Using Probabilistic Risk Assessment in Risk-Informed Decisions on Plant-Specific Changes to the Current Licensing Basis," (Ref. 16) are applicable to TS change requests. Risk-acceptance guidelines are presented in those sections as a function of the result of the licensee's risk analysis SRP 16.1-9 Rev. 0 - August 1998 in terms of total core damage frequency (CDF) predicted for the plant and the change in CDF and large early release frequency (LERF) predicted for the TS change requested by the licensee. In addition, those sections discuss cases when the scope of the licensee's PRA does not include a Level 2 (containment performance) analysis, and when, according to the guidelines presented in Regulatory Guide 1.1 77 and in Regulatory Guide 1. 174, such an analysis is needed. TS submittals for changes to AOTs should also be evaluated against the risk acceptance guidelines presented in this section, in addition to those in Regulatory Guide 1.174. Application of all of the risk acceptance guidelines to individual proposals for TS modifications will be done in a manner consistent with the fundamental principle that changes to TS result in small increases in the risk to the health and safety of the public (Principle