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
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CFR Title: 

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analysis are reviewed to determine that the torsional effects of vibration are incorporated by including the torsional degrees of freedom in the dynamic model. Justification provided by the applicant for the use of any approximate method to account for torsional effects is judged to ensure that it results in a conservative design. 12. Comparison of Responses Where applicable, the responses obtained from both time history and response spectrum methods at selected points in major Category I structures are compared to judge the accuracy-of the analyses conducted. The applicant is asked to discuss the reasons for the large differences in the results of the two methods. 13. Analysis Procedure for Damping The analysis procedure to account for damping in different elements of the model of a coupled system is reviewed to determine that it is in accordance with the acceptance criteria of subsection II.13 of this SRP section. 14. Determination of Category I Structure Overturning Moments Methods to determine Category I structure overturning moments are reviewed to determine compliance with the acceptance criteria of subsection II.14 of this SRP section. 3.7.2-19 Rev. 2 - August 1989 Any matters identified during the review of the SAR where additional information or justification are needed are included in the "Additional Technical Information Request." Such requests not only identify any portions of the seismic system analysis considered unacceptable without further justification, but also specify the changes that should be made in the SAR to meet the acceptance criteria. Subsequent amendments of the SAR received in response to these staff requests are reviewed for conformance with the staff positions. IV. EVALUATION FINDINGS (Combined for Sections 3.7.2 and 3.7.3) The reviewer verifies that sufficient information has been provided and that his evaluation is sufficiently complete and adequate to support conclusions of the following type, to be included in the staff's safety