New concept for the Interim Storage Facility for Spent Fuel Dual purpose cask

The interim storage facility for spent fuel becomes more important and necessary for nuclear fuel management in the world year and year. On the other hand, various storage system are suggested as like using a dual purpose cask and concrete canister system and open site or with building or simplified roof for a dual purpose cask. The main purpose of this system is to prevent the tumble of a cask during earthquake and reduce a site boundary dose ratio because a dual purpose cask itself is very strong for any accident and then strength is not needed for this system. Also, this system is very flexible for expanding storage capacity because this system is module structure which is prefabricated at shop and assembled at the storage area. The cost is also able to be reduced by prefabrication. Portal crane is used for moving a cask to the module rack. The devices to monitor the pressure between double lids and surface temperature of a cask are installed there for storage. The fixed device is installed by a portal crane into the storage area and then the module rack is fixed on the floor by bolts. The neutron shielding material is installed in order to reduce neutron and gamma sky shine for dose boundary. All assembling parts of storage rack is manufactured at the shop and transported to the storage site. And all parts are assembled at the storage site by a portal crane.