Document: NUREG-0800
Document ID: acdd814e-c3ba-4fc6-9914-b7afbf7eddee
Document Type: srp
Title: -
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1319/ML13198A223.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.2
CFR Part: 
CFR Title: 

Content:
an the frequency at which the spectral acceleration converges to approximately the zero period frequency, (ZPA) is reviewed, to ensure that the total response closely simulates the behavior of the SSC during a seismic event. When a response spectrum method is used, the procedure for combining modal responses, including modes with closely spaced frequencies, is reviewed. 8. Interaction of Non-Seismic Category I Structures with Seismic Category I SSCs. The design criteria to account for the seismic motion of non-seismic Category I structures (or portions thereof) in the seismic design of seismic Category I structures (or portions thereof) are reviewed. The seismic design of structures whose continued function is not required but whose failure could adversely impact the intended safety function of a seismic Category I SSC, or result in incapacitating injury to control room occupants, is reviewed. Any special design features employed to protect seismic Category I SSCs from the structural failure of non-seismic 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, critical damping values, soil properties, and SSI on the floor response spectra and response time histories are reviewed.