Storage facility for radioactive material

In an underground type storage chamber for horizontally storing storage vessels made of steel having radioactive materials sealed therein and cooling them by spontaneous ventilation, the storage vessels made of steel are stored in multi-layers in vertical direction. In addition, lifts for transferring casks which transfer the storage vessels made of steel from a nuclear power plant are made movable in vertical and horizontal directions in the underground type storage chamber. In addition, the storage chamber is partitioned so that the air for cooling radioactive materials flows in parallel with or perpendicular to the storage vessels made of steel. Since the storage vessels can be stored in multi-layers, the density upon storing the spent fuels and high level radioactive wastes can be increased. In addition, protection against external flying objects such as crush of air crafts can be attained neither increasing the thickness of the walls of a building excessively nor specifying the shape of the construction site. (N.H.)