Patent ID: 7367288

Claim:
An upper bundle cleaning system of steam generator for cleaning heat transfer tubes and tube support plates which support the heat transfer tubes and have slots, comprising: a mounting fixture installed on an upper hand hole located at one side of the steam generator, in which the upper hand hole is located in a receiving unit; a guide rail which penetrates through the mounting fixture and is transferably installed to the mounting fixture; a transfer member installed between the mounting fixture and the guide rail, to allow the guide rail to reciprocate back and forth; an ascending/descending means pivotably installed to one side of the guide rail; a rotation member installed to the guide rail, for rotating the ascending/descending means; a supporting member installed to a lower hand hole located at the one side of the steam generator, for supporting the ascending/descending means when the ascending/descending means stands vertically and operates; a cleaning device connected to the ascending/descending means, for cleaning the heat transfer tubes and the tube support plates as it moves up and down by the ascending/descending means, and spraying water through a nozzle; a water supplying device for repeatedly performing a water supplying operation in such a way that the water supplying device supplies water to the cleaning device, sucking and filtering the water sprayed from the cleaning device, and then re-supplying the filtered water to the cleaning device; a site control device installed in a peripheral site of the steam generator, for controlling the transfer member, the ascending/descending means, the rotation member, the cleaning device, and the water supplying device; a remote control device located outside the receiving unit, for controlling the transfer member, the ascending/descending means, the rotation member, the cleaning device, and the water supplying device, the cleaning device includes: a frame; at least one guide means installed to the frame for guiding the frame ascended/descended by the ascending/descending means and preventing vibrations when water is sprayed from the nozzle; a spray means for spraying the water supplied from the water supplying device through the nozzle; and a hinge unit installed between the frame and the spray means for allowing the spray means to perform reciprocating and rotation motions, such that the cleaning device is ascended and descended by the ascending/descending means to clean the heat transfer tubes and the tube support plates supporting the heat transfer tubes.