Document: NUREG-0800
Document ID: 1f106a50-722f-45fa-952a-2e7ab7d836c1
Document Type: srp
Title: DYNAMIC TESTING AND ANALYSIS OF SYSTEMS, COMPONENTS, AND EQUIPMENT
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052360453.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.9.2
CFR Part: 
CFR Title: 

Content:
evaluated and the location producing the controlling effects should be identified. Mathematical models used for dynamic system analysis for LOCA in combination with the 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 basis of modeling should be developed and described. b. Mathematical models should be representative of system structural characteristics, such as the flexibility, mass inertia effect, geometric configuration, and damping (including possible coexistence of viscous and Coulomb damping). c. Any system structural partitioning and directional decoupling employed in the dynamic system modeling should be justified. d. The effects of flow upon the mass and flexibility properties of the system should be discussed. 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 used for mathematically tractable flow path geometries, tests for determining flow coefficients, and any semiempirical formulations and scaled model flow testing for determining pressure differentials or velocity distributions. The accept- abilty of the hydraulic analysis, as reviewed by RSB on request, is based on established engineering practice and generic topical reviews performed by the staff. 3.9.2-314 Rev. 2 - July 1981 The methods and procedures used for dynamic system analyses should be des- cribed, 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