| 摘要 |
PROBLEM TO BE SOLVED: To provide a reactor bottom structure machining device and its machining method capable of various kinds of machine works to the reactor bottom structure by remote control of the machining device inserted/removed through a penetration hole of control rod driving mechanism housing from the pedestal side positioned under a reactor pressure vessel, and storing inside a chip recovery hose. SOLUTION: A weld zone of a stub tube which is a machining object in the reactor pressure vessel is enclosed by a cylindrical member, to thereby put the inside of the cylindrical member into the aerial state, and a machining head part of the machining device is inserted into the inside of the control rod driving mechanism housing which is a machining object or into the through hole of the reactor pressure vessel for allowing the control rod driving mechanism housing to penetrate, from the pedestal side supporting the reactor pressure vessel from below. Then, the control rod driving mechanism housing or the stub tube which is the machining object is cut circularly, or a machining work of an excess thickness part after cutting is performed on the trace of a reactor bottom shape of the reactor pressure vessel. COPYRIGHT: (C)2006,JPO&NCIPI
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