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:
is assumes that the majority of repairs can be made in five hours or less and that the NRC has accepted this level of risk for existing operating plants. 4 ICLERP = [(conditional LERF with the subject equipment out of service) - (baseline LERF with nominal expected equipment unavailabilities)J X (duration of single AOT under consideration). SRP 16.1-11 Rev. 0 - August 1998 III. REVIEW PROCESS Licensees are expected to provide strong technical bases for any TS change. The technical bases should be 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 give proper attention to the integration of considerations such as conformance to Standard Technical Specifications, generic applicability of the requested change if it is different from Standard Technical Specifications, operational constraints, manufacturer recommendations, and practical considerations for test and maintenance. Standard practices used in setting AOTs and STIs should be followed, e.g., AOTs normally are 8 hours, 12 hours, 24 hours, 72 hours, 7 days, 14 days, etc. STIs normally are 12 hours, 7 days, I month, 3 months, etc. Using such standards greatly simplifies implementation, scheduling, monitoring, and auditing. Logical consistency among the requirements should be maintained, e.g., AOT requirements for multiple trains out of service should not be longer than that for one of the constituent trains. A. Define the Proposed Change The reasons for requesting the TS change or changes should be stated in the submittal, along with information that demonstrates that the extent of the change is needed. Generally, acceptable reasons for requesting TS modifications fall into one or more of the categories below. I. 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 a reduction in occupational exposure of plant