Patent Number: 
Section: claims

1. A method of storing a core structure in a storage container after the storage container is carried into a reactor containment, said storage container having a vertical protruding portion protruding from the bottom of said storage container, the method comprising:carrying, by using a moving device which is movable, a bottom cover of the storage container to a body of the storage container, said bottom cover having a horizontal protruding portion protruding from a circumference portion of the bottom cover;positioning the body; positioning the bottom cover on the moving device by rolling a free bearing while the bottom cover is supported by the free bearing, the bottom cover being positioned in a horizontal direction such that the horizontal protruding portion closely fits into the vertical protruding portion, as a guide bush is descended along a tapered portion of a guide pin; andattaching the bottom cover to the body after said body is positioned. 2. The method according to claim 1, wherein the attaching includes attaching the bottom cover to the body tightly by pushing up the bottom cover on the moving device. 3. The method according to claim 2, whereinthe carrying of the bottom cover includes fixing the bottom cover onto the moving device, andthe positioning includes releasing the fixing of the bottom cover, so that the bottom cover is supported by the free bearing. 4. The method according to claim 1, whereinthe carrying of the bottom cover includes fixing the bottom cover onto the moving device, andthe positioning includes releasing the fixing of the bottom cover, so that the bottom cover is supported by the free bearing.