Patent Number: 
Section: claims

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; andcarrying 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. 2. The installation method of a water-chamber working apparatus according to claim 1, wherein replacement of a tool attached to an apical end of the manipulator is performed in a state where the apical end of the manipulator is projected from the maintenance hatch of the water chamber to outside thereof while in a state of being suspended in the water chamber. 3. The installation method of a water-chamber working apparatus according to claim 1, wherein, at a time of attaching or detaching a tool, a joint portion of the manipulator is made flexible with respect to an external force.