Repairing method for containment liner plate of nuclear-reactor containment vessel

摘要

The present invention relates to a method for repairing a liner plate in a nuclear reactor building, and more specifically, to a method for repairing a liner plate in a nuclear reactor building, which is capable of repairing a damaged liner plate without installing a backup bar or repairing an inner wall. According to the present invention, in a method of repairing a liner plate in a nuclear reactor building which stores a nuclear reactor, the method of repairing a liner plate in a nuclear reactor building is characterized by comprising: a step of cutting; a step of mounting; and a step of welding. In the step of cutting, a surrounding cutting area of a repair portion in which the liner plate needs to be repaired is cut. In the step of mounting, a liner plate to replace the existing one is mounted on the cut area. In the step of welding, the liner plate to replace the existing one and the liner plate which is cut are welded. In addition, in the method of repairing the liner plate, it is desirable to cut by using a laser in the step of cutting. According to the present invention, it is not necessary to use a backup bar or to repair a concrete inner wall. Accordingly, the present invention can simplify a work process, thereby cutting the work period and curtailing the required personnel.