DEVICE AND METHOD OF DRAWING BLOCKING SLEEVE FROM DETACHABLE GUIDE TUBE OF FUEL AGGREGATE OF NUCLEAR REACTOR

摘要

PURPOSE: To withdraw a fuel assembly easily without damaging it by moving a pole with a retention claw in a blocking sleeve and moving the nib in radius direction and bringing it into contact with the lower edge part of the sleeve and then lifting it. CONSTITUTION: A center bore and a plurality of orifices 56 in radius direction are provided at a pole with a spindle 32. The orifices 56 communicate with the bore and are open to the outer surface of the spindle 32. A rod 41 is mounted slidably in the bore. The rod 41 has a part 63 in small diameter and has a plurality of retention claws 57 and the claws 57 are mounted in the orifice 56. The claws 57 can be moved in radius direction between a lead-in position being stored in the inner-periphery part of a blocking sleeve 25 and a lead-out position protruding from the inner-periphery part. Then, by moving the pole in vertical direction by a winch, the sleeve 25 can be led out.