Document: NUREG-0800
Document ID: fbcd53f5-fb4a-436f-9443-ef89f47e42cc
Document Type: srp
Title: SEISMIC AND DYNAMIC QUALIFICATION OF MECHANICAL AND ELECTRICAL
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1422/ML14227A631.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.10
CFR Part: 
CFR Title: 

Content:
se of plant normal operation, such as thermal and flow-induced loading, if any, should be 1 The NRC staff is completing a revision to Regulatory Guide 1.100 to accept the 2013 edition of IEEE Std. 344 and the 2012 edition of QME-1 for use by applicants and licensees, and this Revision 4 of the guide should be used when final. Conforming updates to this SRP section will be made in a future revision. 3.10-7 Draft Revision 4 – August 2015 concurrently superimposed upon the seismic and other pertinent dynamic loading to the extent practicable. iii. Response spectrum or time history methods should specify the characteristics of the required seismic and dynamic input motions. These characteristics, derived from the seismic and dynamic analyses of the structures or systems, should be representative of the input motions at the equipment mounting locations, except as noted in paragraph 3 below, which addresses the case where the applicant proposes qualification by an experience-based approach. iv. For seismic and dynamic loads, the actual test input motion should be characterized in the same manner as the required input motion, and the conservatism in amplitude and frequency content should be demonstrated (i.e., the test response spectrum (TRS) should closely resemble and envelop the required response spectrum (RRS) over the critical frequency range). v. Since seismic load excitation and dynamic load excitation generally have a broad frequency content, multi-frequency vibration input motion should be used. However, single frequency input motion, such as sine beats, is acceptable provided the characteristics of the required input motion indicate that the motion is dominated by one frequency (e.g., by structural filtering effects), or the anticipated response of the equipment is adequately represented by one mode, or in the case of structural integrity assurance, the input has enough intensity and duration to produce sufficiently high levels of stress for such assurance.