Document: NUREG-0800
Document ID: 6b7eddf4-f7ce-4821-9f11-e37070221e57
Document Type: srp
Title: DYNAMIC TESTING AND ANALYSIS OF SYSTEMS, STRUCTURES, AND
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1613/ML16133A418.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.2
CFR Part: 
CFR Title: 

Content:
f seismic Category I mechanical equipment, refer to SRP Section 3.10. For the design of nuclear air and gas treatment systems and components, acceptable methods and criteria are described in ASME Code AG-1-2012. A. Seismic Analysis Method. For all seismic Category I systems, components, equipment and their supports (including supports for conduit and cable trays, and ventilation ducts), and for certain non-seismic Category I items that are to be designed to seismic criteria, the applicable seismic analysis methods (response spectra, time history, equivalent static load) are reviewed. The manner in which the dynamic system analysis method is performed is reviewed. The method 3.9.2-3 Revision 4 – March 2017 chosen for selection of significant modes and an adequate number of masses or degrees of freedom is reviewed. The manner in which maximum relative displacements between supports is evaluated in the seismic dynamic analysis is reviewed. In addition, other significant effects that are addressed in the dynamic seismic analysis such as hydrodynamic effects and nonlinear response are reviewed. B. Determination of Number of Earthquake Cycles. The number of earthquake cycles during one seismic event, the maximum number of cycles for which systems and components are designed, and the criteria and procedures used by the applicant to establish these parameters are reviewed by the staff for consistency with the methods described in SRP Section 3.7.3. C. Basis for Selection of Frequencies. As applicable, criteria or procedures used to separate fundamental frequencies of components and equipment from the forcing frequencies of the support structure are reviewed. D. Three Components of Earthquake Motion. The procedures by which the three components of earthquake motion are considered in determining the seismic response of systems, and components are reviewed. E. Combination of Modal Responses. When a response spectra method is used, the description of the procedure for