Incore piping section maintenance system of reactor

An incore piping section maintenance system of a reactor, comprising:

• a maintenance system main body having a portion to be inserted into a pipe of an incore piping section located in a reactor pressure vessel;
• a main body supporting mechanism for detachably fixing the maintenance system main body to an inner surface of the pipe;
• a turning arm mounted to another portion of the maintenance system main body and disposed outside the pipe and the maintenance system main body;
• a turning mechanism for turning and driving the turning arm;
• an axial moving mechanism disposed to the turning arm and slidable in a direction substantially parallel to a central axis of the pipe;
• a laser generator for generating a laser beam;
• a laser de-sensitization treatment mechanism supported by the axial moving mechanism and for irradiating the laser beam to an outer surface of the pipe;
• and
• an optical transmission mechanism for guiding the laser beam outputted from the laser generator to the laser de-sensitization mechanism.