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:
adequate range of significant natural frequencies in the high-frequency range of the reference equipment in a class. A one-sixth-octave spacing should be used instead of a one-third-octave spacing. f. Clause 10.3.3.2 (Test Experience Data—Number of Independent Items for Reference Equipment Class) Licensees or applicants should provide justification to show the adequacy of using a minimum of five independent items to define a reference equipment class for test experience. g. Clause 10.4.2 (Special Considerations—Limitations) The list of limitations for the use of earthquake-based or test experience-based methods for the seismic qualification of equipment, as described in Clause 10.4.2, might be incomplete. The list should be expanded to include additional limitations based on new findings from the testing of new equipment or on new studies. 1.2 Regulatory Positions on ASME QME-1-2017 1.2.1 General NRC Staff Positions on Seismic Qualification of Active Mechanical Equipment ASME QME-1-2017 is, in general, acceptable to the NRC staff for the seismic qualification of (1) electrical equipment in new NPPs and (2) new or replacement electrical equipment in operating NPPs, subject to the provisions found below. In the discussion of the seismic qualification of some active mechanical equipment, ASME QME-1-2017 references IEEE Std 344-1987 (Ref. 36) or ASME QME-1-2017, Nonmandatory Appendix QR-A. Such references appear in several sections of ASME QME-1-2017, such as Section QP-7500 for pumps and Sections QV-7450, QV-7650, and QV-7750 for valves. The NRC finds these acceptable to the extent that their application is consistent with the NRC staff’s positions delineated in this RG, as described below. In general, the NRC staff finds ASME QME-1-2017, Nonmandatory Appendix QR-A, acceptable for the seismic qualification of (1) active mechanical equipment in new NPPs and (2) new or replacement active mechanical equipment in operating NPPs. The NRC staff acknowledges that the