SYSTEM FOR DISASSEMBLING INTERNAL STRUCTURE OF NUCLEAR REACTOR BY PLASMA ARC CUTTING TECHNIQUE

摘要

PURPOSE:To improve the function and the efficiency of operations necessary for preventing the expansion of radioactivity contamination by mounting a swivelable and liftable lifting shaft to travelable and traversable devices installed in the upper part of a reactor pressure vessel. CONSTITUTION:A driving device for cutting has a traveling driving device 10, a traversing driving device 13 and a swiveling driving device 16. The entire part is swiveled together with a swiveling table 18. A lifting driving mechanism 20 lifts the lifting shaft 21 and is mounted with a torch 23 in a front end part 26 of the lifting shaft. The in-pile structure 2 is cut by the torch 23. The driving mechanisms consist of the traveling driving mechanism 11 and traversing driving mechanism 14 which are driven by means of ball screws 24, ball nuts 25 and the swiveling driving mechanism 17 which is driven by a pinion and gear. All these mechanisms are driven respectively by motors. The respective driving devices can be controlled in speeds and positions as desired. The cutting route and speed are arbitrarily selected by the combinations thereof.