Installation method of water-chamber working apparatus

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, wherein

• the water-chamber working apparatus includes 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, and
• the installation method includes a base installing step of installing the base on the tube plate surface, and a manipulator coupling step of carrying the separated manipulator into the water chamber sequentially and individually and coupling the manipulator with the base.