UNIFORM GUIDE TUBE WITH BLEED HOLE CLOSING SWITCH

摘要

A uniform guide tube with a bleed hole closing switch is provided to simplify a manufacture process by having uniform inner diameters and outer diameters of an upper part of the guide tube and an impact absorption tube. A guide tube(31) is formed in a uniform hollow tubular shape over entire inner diameter and outer diameter and includes a bleed hole(7) on an outer circumferential surface of a lower part. An impact absorption tube(32) is formed in a hollow tubular shape with an outer diameter to be inserted into the guide tube at a small recess, includes a switch(33) for closing and opening the bleed hole on a lower part, and delays a falling speed of a control rod by closing the bleed hole with the switch when the control rod is inserted in an operation of a nuclear reactor.