To enable the multiple uses of fuel spent in a light water reactors only by conducting recovery treatment involving a simple heat treatment and the reusable fuel processing.

Fuel 1 spent in the light water reactor is extracted from cladding tubes for the light water reactor by recovery treatment involving a simple heat treatment (SP1) and is made reusable fuel by reusable fuel manufacturing (reusable fuel processing; SP2) and the reusable fuel is filled and loaded into cladding tubes for a fast reactor. Additionally, the reusable fuel in the cladding tubes in the fast reactor loaded into them is characterized in that it is made reusable fuel again by being extracted from the cladding tubes for the fast reactor through the recovery treatment involving the simple heat treatment (SP1) and by the reusable fuel manufacturing (SP2) at intervals of a recycle time set within the allowable durability period for the cladding tubes for the fast reactor in it and that the reloading into the fast reactor--the loading into it by filling the reusable fuel into new cladding tubes for the fast reactor--is repeated once or more.

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