Patent Number: 
Section: claims

1. A system for closing a drum unit for storing radioactive waste, the system comprising:a supporting unit configured to be seated on the ground;a drum unit configured to be seated on a top part of the supporting unit and having a plurality of first fastening holes formed along an outer circumferential surface of a top part thereof;a moving unit configured to move to a side of the drum unit;a cover unit provided at an inside of the moving unit or at one side of the drum unit and having a plurality of second fastening holes formed along an outer circumferential surface thereof;tightening units configured to be inserted into the associated second fastening holes;a fastening unit configured to grip the cover unit through a gripping part provided on one side of the inside of the moving unit and to move the cover unit to the top part of the drum unit simultaneously and to allow the cover unit to be seated by aligning axis lines of the first and second fastening holes to be matched, thereby closing a gap between the drum unit and the cover unit by tightening an upper part of each of the tightening units through associated one of a plurality of tool parts provided on a circumference of the gripping part; anda controller configured to control the fastening unit. 2. The system of claim 1, wherein each of the tightening units includes:a fastening bolt having a bolt head formed on an upper part thereof and a first screw thread formed on a lower part thereof;a first bushing having: a hollow first insertion portion into which the fastening bolt is inserted; a first step formed under the first insertion portion; and first latching portions formed so as to be symmetrical to each other in front and rear directions at a bottom part of the first step;a second bushing having: a hollow second insertion portion, into which outer circumferential surfaces of the first latching portions are inserted, and having a top part thereof being latched on the first step; and a plurality of fixing pieces configured as a plurality of incision portions on a circumference of a lower part of the second insertion portion; anda third bushing having: second latching portions formed so as to be symmetrical to each other in left and right directions at an upper part thereof, and inserted into the first latching portions; a second step formed at a part under the second latching portions; and a third hollow insertion portion formed under the second step. 3. The system of claim 2, wherein, when one of the tool parts tightens the bolt head, the third insertion portion formed with a second screw thread on an inner circumferential surface thereof moves to an upper part of the fastening bolt along the first screw thread, and at the same time, the second step presses a bottom part of each of the fixing pieces, and each of the fixing pieces subsequently spreads outward with a boundary line, which is formed at an upper end of each of the incision portions, as a reference, so as to surround an area around a bottom part of the first fastening hole, whereby the drum unit and the cover unit are closed. 4. The system of claim 2, wherein the second step is configured to be tapered at a predetermined angle in a direction from a bottom part to a top part. 5. The system of claim 2, wherein a pair of keys are provided at a lower end of each of the tool parts, and a pair of key grooves into which the pair of keys are inserted are provided on an outer circumferential surface of an upper part of the first insertion portion. 6. The system of claim 1, further comprising:an injection unit provided on the one side of the inside of the moving unit and configured to receive the radioactive waste from an outside to inject the radioactive waste into the drum unit. 7. The system of claim 6, wherein the controller controls positions of the fastening unit and the injection unit so as to move the fastening unit and the injection unit to a position where the drum unit is seated. 8. The system of claim 1, wherein the gripping part is provided with an electromagnet, and the cover unit is made of steel material so that the gripping part grips a top part of the cover unit by a magnetic force of the electromagnet.