Document: NUREG-0800
Document ID: 611e1a8a-5fb2-4d1d-8b0e-7561bc7e46ac
Document Type: srp
Title: SEISMIC AND DYNAMIC QUALIFICATION OF MECHANICAL AND ELECTRICAL EQUIPMENT
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340654.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.10
CFR Part: 
CFR Title: 

Content:
lants for which the CP application was docketed before October 27, 1972, applicants should describe the extent to which the seismic and dynamic qualification of mechanical and electrical equipment and their supports meet the criteria of subsection II.1 above. For equipment that does not meet these requirements, justification should be provided for the use of other criteria. As a minimum, the electrical equipment and their supports should meet the requirements of IEEE Std. 344-1971. It should be demonstrated that all equipment has adequate margin to perform their intended design functions during seismic and dynamic events when considering the effects of possible multi-mode response and simultaneous vertical and horizontal excitations on equipment operability. Specifically, in addition to the criteria of subsection II.1.a(1), (2), (7), (8), (9), (10), (11), (12), (13), and (14) above, the following criteria are applicable. a. Qualification for Equipment Operability (1) Single frequency input excitations, such as continuous single frequency sinusoidal motions or sine beat motions may be used; however, multifrequency input. excitations as delineated in IEEE Std. 344-1975 are preferable and should be utilized whenever possible. In either case, the maximum input motion accelera- tion should equal or exceed the maximum seismic and dynamic acceleration expected at the equipment mounting location. See subsection II.2.b(3) below for a discussion of the participation of the equipment supports. 3.10-7 Rev. 2 - July 1981 (2) For single frequency input excitation, the discrete frequencies at which the test input motion is applied should cover 1-33 Hz for seismic loads. For other dynamic loads, such as in the case of hydrodynamic loads for Mark II and III containments, larger frequency ranges may be required. If resonant frequencies of the equipment and equipment supports are identified by prior analysis or 'sweep" testing or both, tests conducted only at the resonant frequencies