Fluid Structure Interaction Analysis of a Concrete Suppression Chamber of Mark I Containment System

by Rahmat O. Rabizadeh, United Engineers & Constructors, Inc, Structural Analysis Group, Philadelphia, PA, USA,
Pralay K. Das, United Engineers & Constructors, Inc, Structural Analysis Group, Philadelphia, PA, USA,



Document Type: Proceeding Paper

Part of: Structural Engineering in Nuclear Facilities

Abstract: Recent studies have demonstrated that the interaction between a structure and fluid can have a significant influence on the response of the overall system when subjected to certain dynamic loadings. This observation is especially true for the steel torus in Mark I Plants subjected to condensation oscillation and other hydrodynamic loads due to loss of coolant accident. The effect of such loads are evaluated on a concrete torus of a Mark I Containment system. A fluid structure interaction factor is defined and calculated for the concrete torus to show the effect of the fluid interaction on the torus. The finite element method is used to calculate the frequencies and mode shapes of the torus with and without the fluid. The direct frequency response analysis is used to measure the effect of fluid structure interaction due to condensation oscillation loading. The NASTRAN Program is used for all the analyses. It is found, as expected, that the interaction between the fluid and the structure is not significant in calculating the responses of the concrete torus. Typical results of the analyses are presented and discussed.

Subject Headings: Fluid-structure interaction | Dynamic loads | Concrete | Concrete structures | Oscillations | Hydrodynamics | Accidents | Finite element method

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