Patent ID: 8016950

Claim:
A hydraulic drive type partial inter-tube lancing system for cleaning a steam generator in a nuclear power plant, wherein: a rail is installed in an elongated rectangular receiving space in the steam generator, by use of a rail supporter and hand-hole flange fastened to a cylindrical fixing rod and hand-hole of the steam generator, by passing through a driving device; the driving device includes first and second servo motors, a pulley, a strip scroll box from which a transfer strip is unwound so as not to prevent operation of the system, and a geared rotating joint for transmission of a twisting rotation force; the rail takes the form of an assembly of three rail segments and has a center elongated rectangular opening for mounting of a lancing robot and barrel spray, and a transfer strip slot for movement of the transfer strip, the rail being able to perform twisting rotation; the lancing robot includes an elongated lance of a small-diameter and long-length provided with a high-pressure water nozzle to eject high-pressure water with straightness; and a cable handling device is provided to handle an electric power cable or a high-pressure water hose for supplying electric power and high-pressure water to the system so as not to prevent operation of the system.