EFFECT OF IMPACT POINT OFFSET OF A SOLID MILD STEEL PLATE TO THE NUCLEAR MATERIAL TRANSPORT CASK IN DROP TEST III

IAEA Safety Standards No.TS-R-1 para.727 (c) requires drop test III. To assure the integrity of a cask in drop test III, the specimen is required to suffer maximum damage. In this study, the analyses of drop test III were conducted considering offset drop position of a solid mild steel plate to a transport cask with a weight of less than 500 kg. The deformation of a transport cask is an important factor related to the damage. Therefore, we studied the relationship between the offset drop position of the plate and the maximum deformation of the cylindrical transport cask with a vertical attitude. The analysis model comprises a steel plate and the stainless steel transport cask with a radius of approximate 400 mm. The steel plate with a horizontal attitude dropped from 9 m height with changing the offset drop position. As the result, it was found that the maximum deformation became significantly large in the drop analysis when the offset was taken into account. Therefore, it was concluded that the drop analysis considering offset drop position is important to evaluate of the maximum deformation in drop test III.