Document: NUREG-0800
Document ID: e8ae4ac1-29ed-46b1-b4c2-19c7f632e815
Document Type: srp
Title: DYNAMIC TESTING AND ANALYSIS OF SYSTEMS, COMPONENTS, AND
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070336.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.2
CFR Part: 
CFR Title: 

Content:
iteria or procedures used to separate fundamental frequencies of components and equipment from the forcing frequencies of the support structure are reviewed. 3.9.2-3 DRAFT Rev. 3 - April 1996 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 spectrum approach is used for calculating the seismic response of systems, or components, the phase relationship between various modes is lost. Only the maximum responses for each mode can be determined. The maximum responses for modes do not in general occur at the same time and these responses have to be combined according to some procedure selected to approximate or bound the response of the system. When a response spectra method is used, the description of the procedure for combining modal responses (shears, moments, stresses, deflections, and accelerations) is reviewed, including that for modes with closely spaced frequencies. f. Analytical Procedures for Piping Systems The analytical procedures applicable to seismic analysis of piping systems, including methods used to consider differential piping support movements at different support points located within a structure and between structures, are reviewed. g. Multiply-supported Equipment and Components with Distinct Inputs The criteria and procedures for seismic analysis of equipment and components supported at different elevations within a building and between buildings with distinct inputs are reviewed. h. Use of Constant Vertical Static Factors Where applicable, the justification provided for the use ofusing constant static factors rather than a vertical seismic system dynamic analysis to compute as vertical response loads for designing Category I of affected systems, components, equipment and their supports in lieu of the use of a vertical seismic system dynamic analysis is