Document: NRC Regulatory Guide
Document ID: 60ac4a53-3f72-4e92-9ad2-39c736cf2135
Document Type: regulatory_guide
Title: Functional Specification for Active Valve Assemblies in Systems Important to Safety in Nuclear Power Plants
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0037/ML003739979.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.148
CFR Part: 
CFR Title: 

Content:
ccurs during or after the specified event. (3) Instead of item e of 3.3.2, the followingshould be used: "e. motor power and duty requirements, including stall current." (4) Instead of Section 3.3.2.1, "Electrical Power for* Valve Actuators and Control Elements," the following should be used: "Electrical power shall be identified as AC (single phase or three phase) or DC. Applicable voltage and frequency operating ranges shall be specified.'" (5) In Section 3.3.3, "Environmental Conditions," the terms "normal" and "abnormal" environmental conditions should be interpreted to mean the environmental conditions that will exist as a result of specified plant conditions. The term "environmental 'conditions" should be interpreted to include both the environment external to the valve assembly and that of the controlled fluid inside the valve assembly. d. Section 3.4, "Seat Leakage Limits," should be supplemented, as applicable, by the following: 6As defined in the Standard Technical Specifications for Westing house, Combustion Enginee mng, and Babcock and Wilcox Presurized Water Reactors. The Standard Technical Specification for General Electric Boiling Water Reactors uses the word "Condition" rather than "Modes." 1.148-3 (1) The leakage limits identified in paragraph h of this section should include identification of fluid, temperature, and differential pressure for which the limit applies. (2) If valve assembly function requires a limit on overall leakage (e.g., leakage in addition to that of the main seat, such as stem packing and flange), such overall leakage limit should be specified in this section. D. IMPLEMENTATION Except in those cases in which an applicant proposes an acceptable alternative method for complying with specified portions of the Commission's regulations, the method described in this guide will be used in the evaluation of (1) construction permit applications, (2) standard reference system preliminary design applications (PDA) or Type-2 final design