Abstract
The spent fuels from nuclear power stations are stored in a cask until reprocessed.It is concerned that the cask turns over when an earthquake occurs,because it is generally freely standing on a horizontal floor.This study investigates the rocking motion of a cask experimentally and analitically using CAE software named MATLAB.When earthquake occurs,rocking and sliding motion will occur at the same time,however we consider only rocking motion.A cask is huge and the weight is about 157 tons,therefore we make a reduced scale model.The scale factor is 1/1000 and the weight is about 15kg.In the experiment,we excite the experimental model by applying initial angle or sinusoidal wave,and rocking angle is measured.The experimental results are compared with the analytical ones to check the validity of the analytical method.In the analyses,we vary the coefficient restitution,and study the validity of the analytical model on restitution coefficient.Next,we suggest Gyro system in order to prevent the rocking motion.This Gyro system gives the cask Gyroscopic effect,thus the rocking motion can be reduced in analytically.Expwriments are conducted using a gyrosystem model to examine the validity of simulation model.
