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:
REVIEW RESPONSIBILITIES Primary - Structural and Geosciences Branch (ESGB) Secondary - None 1. AREAS OF REVIEW The following areas related to the seismic system analysis described in the applicant's safety analysis report (SAR) are reviewed. 1. Seismic Analysis Methods For all Category I structures, systems, and components, the applicable seismic analysis methods .(response spectra, single time history or multiple time histories, equivalent static load) are reviewed. The manner in which the dynamic system analysis method is performed, including the modeling of foundation torsion, rocking, and translation, is reviewed.. The method chosen for selection of significant modes and an adequate number of masses or degrees of freedom is reviewed. The manner in which consideration is given in the seismic dynamic analysis to maximum relative displacements between supports is reviewed. In addition, other significant effects that are accounted for in the dynamic seismic analysis such as hydrodynamic effects and nonlinear response are reviewed. If tests or empirical methods are used in lieu of analysis for any 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 allow- able stresses near elastic limits of the structures. However, for certain special cases (e.g., evaluation of as-built structures), the staff has accepted the concept of limited inelastic/nonlinear behavior when appro- priate. The actual analysis, incorporating inelastic/nonlinear considerations, is reviewed on a case-by-case basis. Rev. 2 - August 1989 USNRC STANDARD REVIEW PLAN Standard review plans are prepared for the guidance of the Office of Nuclear Reactor Regulation staff responsible for the review of applications to construct and operate nuclear power plants. These documents are made available to the public as part of the Commission's policy to Inform the nuclear Industry and the general