FIV2018 Paper Management System, FIV2018 Conference

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Analysis on vibration characteristics of the spent fuel pool instrument under the interaction of seismic load and fluid force
Lai Jiang

Last modified: 2018-05-27

Abstract


In an earthquake, the loads acting on the spent fuel pool instrument are very complicated,which are mainly comprised with seismic load and fluid force. The reliability of the spent fuel pool instrument is very important for the security of the nuclear power plant under the interaction of seismic load and fluid force. Using the principle of force superposition, the mechanical property of the spent fuel pool instrument was analyzed considered both seismic load and fluid force in this paper. Firstly, the natural frequencies of the spent fuel pool instrument were calculated with finite element method both in air and water, especially in water, the added mass of the instrument was calculated. And based on the finite element model, the max stress and strain of the spent fuel pool instrument under seismic load was computed. Secondly, the hydrodynamic pressures of the spent fuel pool instrument under the earthquake conditions were calculated by potential fluid theory. Lastly, in order to obtain the flow induced vibration of the spent fuel pool instrument, the coupling vibration equations of the spent fuel pool instrument were presented in this paper to calculate the stress and deformation under the hydrodynamic loads. According to this method, the max stresses and strains of the spent fuel pool instrument at different water level of spent fuel pool were computed, and the mechanical property of the spent fuel pool instrument under different water level and earthquake conditions were analyzed.

 


Keywords


flow induced vibration, spent fuel pool instrument, seismic load, fluid force

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