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:
hods for Seismic Qualification of Power Actuated and Relief Valve Assemblies,” specify provisions for seismic qualification of Section QV Category A and B power-actuated valve assemblies and Section QV Category B relief valve assemblies. The NRC staff considers the provisions in Nonmandatory Appendix QV-B and QME Case QME-007 to be acceptable when such provisions are implemented consistent with this RG. 1.3 Regulatory Positions on IEEE Std C37.98-2013 The NRC staff finds IEEE Std C37.98-2013 acceptable for the seismic qualification testing of protective relays and auxiliaries based on the following features of the standard. Fragility testing is used to determine the ultimate capability of protective relays and auxiliaries to perform their intended function, whereas proof testing is used to qualify protective relays and auxiliaries for a particular requirement. Generic testing of protective relays and auxiliaries may be considered a special case of proof testing to show qualification for a wide variety of applications during one test program. Section 6 provides test methods and acceptance criteria for fragility testing, proof testing, and generic testing. Annex B provides guidance to develop seismic test levels to conduct fragility testing, and Annex C provides guidance on the measurement of contact chatter that may be recorded during the seismic testing of relays. The protective relays and auxiliaries important to safety should be seismically qualified and application-specific criteria and requirements should be considered (i.e., the floor elevation, mounting, and location of the relay at the nuclear facility/station could change the seismic qualification requirements because the specific application could have further restrictions on the acceptable level of relay chatter for ensuring the reliability of digital control/protective systems). 2. Functional Qualification of Active Mechanical Equipment 2.1 Regulatory Positions on ASME QME-1-2017 2.1.1 General NRC Staff