Document: NRC Regulatory Guide
Document ID: cdc706d5-60ed-40a4-b55a-9771904107a7
Document Type: regulatory_guide
Title: Seismic Qualification of Electric and Mechanical Equipment for Nuclear Power Plants (Rev. 4)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1809/ML18093A675.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.100
CFR Part: 
CFR Title: 

Content:
s described in Appendix QV-B. The seismic test load force should be applied at the center of gravity of the extended structure of the valve in the seismic side load test as described in Appendix QV-B. Users of ASME QME-1 should develop a method to establish the boundary between the valve body and the extended structure of the valve consistent with the definition of “extended structure” in Article QV-4000, “Definitions,” of Section QV. For example, the boundary of the extended structure for a valve with a flanged body to bonnet joint could be established as the flange joint between the valve body and bonnet. 2.1.2 Specific NRC Staff Positions a. The definition of “valve assembly” in Article QV-4000 refers to power-operated valves. The NRC staff considers the power actuators for valve assemblies to include all types of DG-1328, Page 19 power actuators, such as motor, pneumatic, hydraulic, solenoid, and pyrotechnic- actuated, as added in ASME QME-1-2017, and other drivers. b. Article QV-6000, “Qualification Specification,” states that the owner or owner’s designee is responsible for identifying the functional performance characteristic requirements for a valve assembly and that a qualification specification prepared in accordance with Mandatory Appendix QV-I shall provide these requirements. The NRC staff considers Mandatory Appendix QV-I to be a necessary part of the implementation of ASME QME-1-2017, Section QV. For example, Mandatory Appendix QV-I provides the definitions of Section QV Category A and B valve assemblies in ASME QME-1-2017, Section QV. c. ASME QME-1-2017, Section QDR, specifies provisions for the qualification of viscoelastic dampers in addition to other dynamic restraints. In addition, QME Case QME-006, “Qualification of Viscoelastic Dampers as Dynamic Restraints,” specifies provisions to allow viscoelastic dampers to be qualified as dynamic restraints. In light of the design differences between viscoelastic dampers and other