Document: NRC Regulatory Guide
Document ID: c7a40fcc-fc9d-4eb2-ad86-f9f5b0f04c82
Document Type: regulatory_guide
Title: Plant-Specific, Risk-Informed Decisionmaking:  Technical Specifications (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1920/ML19206A489.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.177
CFR Part: 
CFR Title: 

Content:
d availability. In addition, this RG describes acceptable TS change implementation strategies and performance monitoring plans that will help ensure that assumptions and analyses supporting the change are verified. It also indicates an acceptable level of documentation to reach a finding that the licensee has performed a sufficiently complete and scrutable TS change analysis and that the results of the engineering evaluations support the licensee’s proposed TS change. Risk-informed TS submittals may address either permanent changes to TS requirements or one-time-only changes. Once approved, permanent changes apply to all future occurrences. Licensees request a one-time-only change to a TS requirement for a particular condition and for a specified period, typically for a CT. This RG provides guidance for both permanent and one-time-only CT changes to TS. In addition, the term “operable” used in this document and the single-failure criterion should be understood within the context of this RG. All TS should contain a definition of terms “operable” and “operability” that is similar to the following definition from NUREG-1431, “Standard Technical Specifications: Westinghouse Plants” (Ref. 11): A system, subsystem, train, component, or device shall be OPERABLE or have OPERABILITY when it is capable of performing its specified safety function(s) and when all necessary attendant instrumentation, controls, normal or emergency electrical power, cooling and seal water, lubrication, and other auxiliary equipment that are required for the system, subsystem, train, component, or device to perform its specified safety function(s) are also capable of performing their related support function(s) As described above, a plant-specific TS may differ from the STS definition of Operable – Operability. Therefore, some judgment is needed in applying the guidance in the Inspection Manual Chapter 0326, “Operability Determinations” (Ref. 15). The staff gives the