Document: NUREG-0800
Document ID: 7c104096-d040-463a-a94b-a0af08ab3478
Document Type: srp
Title: DYNAMIC TESTING AND ANALYSIS OF SYSTEMS, STRUCTURES, AND
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0702/ML070230008.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.2
CFR Part: 
CFR Title: 

Content:
ign, size, configuration, and operating conditions as the prototype, the vibration test program should comply with the requirements of the appropriate non-prototype program as specified in RG 1.20. 5. For requirements of GDCs 2, 4, 14, and 15 dynamic system analyses should confirm the structural design adequacy of the reactor internals and the reactor coolant piping (unbroken loops) to withstand the dynamic loadings of the most severe LOCA in combination with the SSE. Where a substantial separation between the forcing frequencies of the LOCA (or SSE) loading and the natural frequencies of the internal structures can be demonstrated, the analysis may treat the loadings statically. Evaluations performed under SRP Section 3.6.3, address review of applications that propose to eliminate consideration of design loads of the dynamic effects of pipe rupture. Evaluation in this Section should interface with the evaluation in Section 3.6.3. 3.9.2-22 Revision 3 - March 2007 The most severe dynamic effects from LOCA loadings generally result from a postulated double-ended rupture of a primary coolant loop near a reactor vessel inlet or outlet nozzle with the reactor in the most critical normal operating mode. However, all other postulated break locations should be evaluated and the location producing the controlling effects should be identified. Mathematical models used for dynamic system analysis for LOCAs in combination with SSE effects should include the following: A. Modeling should include reactor internals and dynamically-related piping, pipe supports, 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 such structural characteristics 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