Document: NUREG-0800
Document ID: 6b7eddf4-f7ce-4821-9f11-e37070221e57
Document Type: srp
Title: DYNAMIC TESTING AND ANALYSIS OF SYSTEMS, STRUCTURES, AND
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1613/ML16133A418.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.2
CFR Part: 
CFR Title: 

Content:
, components, and fluid-structure interaction effects when applicable. Typical diagrams and the modeling basis should be developed and described. B. Mathematical models should typify system structural characteristics such as flexibility, mass inertia effect, geometric configuration, and damping (including possible coexistence of viscous and Coulomb damping). C. Any system structural partitioning and directional decoupling in the dynamic system modeling should be justified. D. The effects of flow upon the mass and flexibility properties of the system should be addressed. Typical diagrams and the basis for postulating the LOCA-induced forcing function should be provided, including a description of the governing hydrodynamic equations and the assumptions for mathematically tractable flow path geometries, tests for determining flow coefficients, and any semi-empirical formulations and scaled model flow testing for determining pressure differentials or velocity distributions. The acceptability of the hydraulic analysis, as reviewed on request, is based on established engineering practice and generic topical reviews by the staff. 3.9.2-29 Revision 4 – March 2017 The methods and procedures for dynamic system analyses should be described, including the governing equations of motion and the computational scheme for deriving results. Time domain forced-response computation is acceptable for both LOCA and SSE analyses. The response spectrum modal method may be used for SSE analysis. The stability of such elements in compression as the core barrel and the control rod guide tubes under outlet pipe rupture loadings should be evaluated. 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 described in SRP Sections 3.9.3 and 3.9.5. For PWRs, the criteria and review methods for verifying whether the applicant has appropriately addressed