Abstract
The spent fuels from nuclear power stations are stored in a canister which is put in a cask until reprocessed. The cask is freely standing on a horizontal floor in general. Thus, it is very important to evaluate the rocking motion of a cask-canister system due to seismic excitation. In an analytical model, the canister and the cask are treated as rigid bodies which are connected by a spring. The equations of motion are derived for rocking motion when the floor is subjected to the horizontal earthquake excitation. The rocking angle of the cask and the relative displacement of the canister against the cask are evaluated by numerical simulation, and the effects of the canister vibration on the cask motion are discussed.
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