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:
C. REGULATORY POSITION The requirements delineated in ANSI N278.1-1975 (1) are generally acceptable to the NRC staff for functional specifications of active valve assemblies whose operability must be ensured and (2) provide an adequate basis for complying with those requirements of Criterion 1 of Appendix A and Section III of Appendix B to 10 CFR Part 50 relating t'o the correct translation into specifications, as supplemented or modified by the following: 1. Applicability and Relationship With Other Standards a. The scope of ANSI N278.1-1975, as stated in Section 1 of the standard, should be supplemented to include active manually operated valve assemblies in systems important to safety.5 b. The phrase design specification relationship, used in Section 2 of the standard to indicate an interrelationship with other codes and standards, should be broadly inter preted to include a document that contains sufficient detail to serve as a "complete basis for construction" and may, as appropriate, be called an equipment specification, procurement specification, or some similar term that includes the Design Specification required by the ASME Code. However, when valve operability is a requirement, the functional specification required by N278.1-1975 should be provided either as part of, or concurrent with, the controlling document that serves as the "complete basis for construc tion." For ASME Code Class 1, 2, and 3 valves, the "Valve 5Manually operated valves are those that are operated physically by an operator. Power-operated valves may be manually controlled by an operator or automatically controlled. 1.148-2 f I Design Specification" identified in Section 2 of N278.1-1975 should be that required by NCA-3250, "Provision of Design Specifications," of Subsection NCA, "General Requirements," of Section III of the Code. c. The valve functional specification should meet the following requirements in the ASME Code: (I) It should be uniquely identified and referenced in the