STRENGTH ANALYSIS OF THE CONSTOR STEEL-CONCRETE CASK MODEL UNDER DYNAMIC TESTS

A drop test series has been performed with a 1 :2 scale model of a CONSTOR-type steelconcrete cask (mass - 90 t) designed for transportation and storage of spent fuel of NPP. Characteristic points were selected on the outer and inner surfaces of the model where more than 30 strain gauges and accelerometers were mounted. Their indications (strain, acceleration) were recorded as continuous functions of time in the process of impact testing of the model. Before the beginning of the tests the mechanical behaviour of the model under the drop test conditions was analysed taking into account all dynamic processes in the model. As a result time-functions of strain or acceleration were calculated for every point where strain gauges or accelerometers were mounted. The wave character of stress-strained state of the model in the process of impact was taken into account in forming the prediction. By direct comparison of analysis and experimental results, the degree of reliability of analytical methods and admissibility of asSUmptions taken in cask designing and in demonstration of its safety under conditions of transportation and storage was checked.