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:
support regulatory decision-making) of the risk argument, including the appropriate blend of quantitative and qualitative assessments. III. REVIEW PROCEDURES The reviewer will select material from the procedures described below, as may be appropriate for a particular case. These review procedures are based on the identified SRP acceptance criteria. For deviations from these acceptance criteria, the staff should review the applicant’s evaluation of how the proposed alternatives provide an acceptable method of complying with the relevant NRC requirements identified in Subsection II. Licensees are expected to provide for any TS change strong technical bases rooted in traditional engineering and system analyses. TS change requests based on PRA results alone should not be submitted for review. TS change requests should integrate such considerations as compliance with STSs, generic applicability of the requested change if different from STSs, operational constraints, manufacturer recommendations, and test and maintenance practicalities. Standard practices for setting AOTs and STIs should be followed (e.g., AOTs normally are eight hours, 12 hours, 24 hours, 72 hours, seven days, 14 days, etc., STIs normally 12 hours, 7 days, one month, three months, etc.). Such standards greatly simplify scheduling, monitoring, and auditing. Logical consistency among requirements should be maintained (e.g., AOT requirements for multiple trains out of service should not be longer than for one of the constituent trains). 16.1-10 Revision 1 - March 2007 1. Define the Proposed Change The reasons for requesting the TS change or changes should be stated with information demonstrating that the extent of the change is needed. Generally, acceptable reasons for requesting TS modifications fall into one or more of the following categories: A. Improvement in Operational Safety. The reason for the TS modification may be to improve operational safety; that is, a reduction in the plant risk or in