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:
2. Natural Frequencies and Response Loads For the operating license review, the summary of natural frequencies and response loads is reviewed for compliance with the acceptance criteria in subsection II.2 of this SRP section. 3. Procedures Used for Analytical Modeling The procedures used for modeling of seismic system analyses are reviewed to determine whether the three-dimensional characteristics of structures are properly modeled in accordance with the acceptance criteria of subsec- tion II.3 of this SRP section and whether all significant degrees of freedom have been incorporated in the models. The criteria for decoupling of a structure, equipment, or component and analyzing it separately as a subsystem are reviewed for conformance with the acceptance criteria given in subsection II.3 of this SRP section. 4. Soil-Structure Interaction The methods of soil-structure interaction analysis used are examined to determine that the techniques employed are in accordance with the accept- ance criteria-as given in subsection II.4 of this SRP section. Typical mathematical models for soil-structure interaction analysis are reviewed to ensure the adequacy of the representation in accordance with subsection II.4 of this SRP section. In addition, the methods used to assess the effects of adjacent structures on structural response in soil-structure interaction analysis are reviewed to establish their acceptability. 5. Development of Floor Response Spectra Procedures for developing the floor response spectra are reviewed to verify that they are in accordance with the acceptance criteria specified in subsection II.5 of this SRP section. If a modal response spectrum method of analysis is used to develop the floor response spectra, its conservatism compared to that of a time history approach is reviewed. 6. Three Components of Earthquake Motion The procedures by which the three components of earthquake motion are considered in determining the seismic response of structures, systems,