Patent ID: 8973265
Filing Date: 2015-03-10
Classification: B25J,F22B,G21D,Y02E,Y10T

Abstract:
1. An installation method of a water-chamber working apparatus that is suspended from a tube plate surface of a water chamber in a steam generator and driven by remote control to perform a work in the water chamber, the water-chamber working apparatus including a base that holds heat transfer tubes on the tube plate surface and is fixed to the tube plate surface, and a manipulator that is coupled with the base, suspended in the water chamber and arranged therein, and has a separable configuration, comprising: installing an attaching jig including a wire on the tube plate surface; lifting the base by winching the wire; securing the base on the tube plate surface by inserting a plurality of clampers of the base into the heat transfer tubes; spanning between a maintenance hatch and a lower part of the base with the attaching jig which is formed of a long plate-like member curved in a circular arc shape; and carrying a rear stage of the manipulator from the maintenance hatch to the lower part of the base by sliding the rear stage on the attaching jig.