INSPECTION/REPAIR DEVICE FOR INTERIOR OF NUCLEAR REACTOR PRESSURE VESSEL AND ITS METHOD

摘要

PPROBLEM TO BE SOLVED: To horizontally move a head for inspection/repair in an area wider than a lattice pitch by installing an inspection/repair device at one position on a CRD housing upper end part. PSOLUTION: This inspection/repair device, used for inspecting or repairing a CRD housing, a stub tube, and a weld part, installed on a lower end-plate inner surface or on a reactor bottom part lower than a CR guide tube in a nuclear reactor pressure vessel, is equipped with a foldable extension arm 20 for horizontally moving the head for inspection/repair by vertically moving one 24 of two support points, a hoisting mechanism 28 for vertically moving a feed bar 27 by rotating a feed screw 26, and a hoisting pole 25 having a slider 23 vertically moving with one of the support points of the extension arm linked to the feed bar. The extension arm 20 is disposed at a separate position on a separated part of the hoisting mechanism 28 by the hoisting pole 25 while the head 30 for inspection/repair is horizontally moved via the slider 23 by the rotation of the feed screw 26. PCOPYRIGHT: (C)2005,JPO&NCIPI