Processing method for radioactive wastes

Upon processing radioactive wastes, especially, medium level wastes, a hollow underground structure is constructed in a base lock, and a partition is disposed therein. A vessel for radioactive wastes is hung down into each of the partitioned spaces, then the partition is pulled up, and the upper portion of the partition is dismantled and removed as much as the pulled up amount. Fillers are packed around the hung down vessels, and the hung down steps and the packing steps are repeated to stack the vessels to a predetermined height. With such a constitution, the partition acts as a vibration-proof guide or positioning means upon settling the vessels of radioactive wastes. Then, space for artificial barriers can be kept around the vessels, in addition, the processing cost can be reduced. (T.M.)