Document: NUREG-0800
Document ID: 228b9b6e-c81e-4d76-9b8e-12f6c3bd7fa1
Document Type: srp
Title: and Regulatory Guide 1.92,(Reference 10) "Combining Modal Responses
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070336.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.2
CFR Part: 
CFR Title: 

Content:
mic system analyses should be described, including the governing equations of motion and the computational scheme used to derive results. Time domain forced-response computation is acceptable for both LOCA and SSE analyses. The response spectrum modal analysis method may be used for SSE analysis. The stability of elements in compression, such as the core barrel and the control rod guide tubes under outlet pipe rupture loadings should be investigated. Either response spectra or time histories may be used for specifying seismic input motions of the SSE at the reactor core supports. The criteria for acceptance of the analytical results are as provided in SRP Sections 3.9.3 and 3.9.5. For PWRs, the criteria and review methods for verifying that the applicant has appropriately addressed asymmetric blowdown loadings on reactor internals are described in SRP Section 3.9.5.47 6. Relevant requirements of GDC 1 are met as given below. Regarding the correlation to be made of tests and analyses of reactor internals, a discussion covering the following items to assureensure the adequacy and sufficiency of the test and analysis results should be provided: a. Comparison of the measured response frequencies with the analytically obtained natural frequencies of the reactor internals for possible verification of the mathematical model used in the analysis. DRAFT Rev. 3 - April 1996 3.9.2-18 b. Comparison of the analytically obtained mode shapes with the shape of measured motion for possible identification of the modal combination or verification of a specific mode. c. Comparison of the response amplitude time variation and the frequency content obtained from test and analysis for possible verification of the postulated forcing function. d. Comparison of the maximum responses obtained from test and analysis for possible verification of stress levels. e. Comparison of the mathematical model used for dynamic system analysis under operational flow transients and under the combined LOCA