Response Spectrum Analysis of Cask Assembly considering Void Swelling

The current situation requires an economical and compact storage due to limited wet storage capacity. The spent fuel dry storage is an alternative and study of structural assessment for longterm storage is necessary until the final management policy for spent fuel is determined. In this study, effect of the void swelling on a dry storage cask assembly in Korea was investigated. Modal analysis of the integrated assembly was performed based on the previous research and design document to determine individual mode shapes and frequencies. Subsequently, the structural integrity regarding to the earthquake was evaluated through a response spectrum analysis by using output variables of modal analysis and levels of void swelling. In this study, effects of the irradiation on dynamic response of a Korean cask assembly have been examined and the followings key findings were derived. 1) The first mode shape of cask assembly occurred at 27.29 Hz on unirradiated condition 2) The maximum von Mises stress of 47.07 MPa occurred at bottom of basket assembly.