Document: NUREG-0800
Document ID: 78905d69-1945-4638-99b9-2db68eb3da77
Document Type: srp
Title: SEISMIC SYSTEM ANALYSIS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070318.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.2
CFR Part: 
CFR Title: 

Content:
employed are in accordance with the acceptance criteria as given in subsection II.1 of this SRP section. If empirical methods or tests are used in lieu of analysis for any Category I structure, these are evaluated to determine whether or not the assumptions are conservative, and whether the test procedure adequately models the seismic response. 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 subsection 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 acceptance 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