DEMOLITION METHOD FOR CONCRETE STRUCTURE INSIDE NUCLEAR REACTOR CONTAINMENT VESSEL AND DEMOLITION DEVICE FOR THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a demolition method for a concrete structure inside a nuclear reactor containment vessel and a demolition device for the same capable of reliably demolishing and removing the concrete structure of a pedestal and a reactor shielding wall by remote control even when an inside of the nuclear reactor containment vessel is contaminated at a high level.SOLUTION: A demolition method for a concrete structure inside a nuclear reactor containment vessel comprises: a working floor assembling process to assemble a working floor 15 having a radius smaller than the radius of a concrete structure 1 on an operation floor 5 above a nuclear reactor containment vessel A; a working floor suspending facility installation process to install a work floor suspending facility 16 which supports the working floor 15 by suspending the same so as to be movable between the operation floor 5 and an inside of the concrete structure 1; a working floor installation process to install the working floor 15 at a predetermined position inside the concrete structure 1; a demolition device installation process to install a demolition device 22 on the working floor 15; and a concrete structure demolition process to demolish the concrete structure 1 from an upper edge section thereof with the remotely controlled demolition device 22.