Document: NUREG-0800
Document ID: c165ebfe-8431-4d56-8bc9-97c2227d45bb
Document Type: srp
Title: SEISMIC SYSTEM ANALYSIS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0706/ML070640311.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.2
CFR Part: 
CFR Title: 

Content:
REVIEW RESPONSIBILITIES Primary - Organization responsible for reviews of seismic/geotechnical issues Secondary - None I. AREAS OF REVIEW The specific areas of review are as follows: 1. Seismic Analysis Methods. For all seismic Category I structures, systems, and components (SSCs), the applicable seismic analysis methods (response spectrum analysis method, time history analysis method or equivalent static load analysis method) are reviewed. The manner in which the dynamic system analysis is performed, including the modeling of foundation torsion and overall building rocking and translation, is reviewed. The modeling of soil-structure interaction (SSI) effects is reviewed. The method chosen for the determination of significant modes and an adequate number of discrete mass degrees of freedom is reviewed. The manner in which consideration is given in the seismic analysis to maximum relative displacements between supports is reviewed. In addition, other significant effects that are accounted for in the seismic analysis such as hydrodynamic effects and nonlinear analysis methods and responses are reviewed. For each area of review, the staff selects representative locations and seismic response quantities of interest. If tests or empirical methods are used in lieu of analysis for any seismic Category I structure, the testing procedure, load levels, and acceptance basis are also reviewed. The SRP criteria generally deal with linear elastic analysis, coupled with allowable stresses near elastic limits of the structures. However, for certain special cases (e.g., evaluation of as-built structures), the staff has accepted the consideration of limited inelastic/nonlinear behavior when appropriate. The staff conducts a detailed review of all inelastic/nonlinear analyses. 3.7.2-2 Revision 3 - March 2007 2. Natural Frequencies and Responses. The staff reviews the significant natural frequencies and responses (accelerations, displacements, and member forces) for all seismic