Document: NUREG-0800
Document ID: 29f5ac9f-4962-4021-913a-6375076e03fd
Document Type: srp
Title: SEISMIC SYSTEM ANALYSIS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340566.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.2
CFR Part: 
CFR Title: 

Content:
ese responses have to be combined according to some procedure selected to approximate or bound the response of the system. When a response spectrum 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. 3.7.2-3 Rev. 2 - August 1989 - . I 8. Interaction of Non-Category I Structures with Category I Structures The design criteria to account for the seismic motion of non-Category I structures or portions thereof in the seismic design of Category I struc- tures or portions thereof are reviewed. The procedures that are used to protect Category I structures from the structural failure of non-Category I structures, due to seismic effects, are reviewed. 9. Effects of Parameter Variations on Floor Responses The procedures that are used to consider the effects of the expected variations of structural properties, dampings, soil properties, and soil-structure interaction on the floor response spectra and time histories are reviewed. 10. Use of Equivalent Vertical Static Factors Where applicable, justification for the use of equivalent static factors as vertical response loads for designing Category I structures, systems, and components in lieu of the use of a vertical seismic system dynamic analysis is reviewed. 11. Methods Used to Account for Torsional Effects The method employed to consider torsional effects in the seismic analysis of Category I structures is reviewed. The review includes evaluation of the conservatism of any approximate methods to account for torsional accelerations in the seismic design of Category I structures. 12. Comparison of Responses For the operating license review, where applicable, the comparison of seismic responses for major Category I structures using modal response spectrum and time history approaches is evaluated. 13. Analysis Procedure for Damping The analysis procedure to account for the