Modular lower moving system for nuclear fuel handling

A modular lower moving system for nuclear fuel handling, the modular lower moving system comprising:

• a lower reactor vessel assembly installed below a reactor vessel located in a reactor area, detachable from the reactor vessel, and comprising nuclear fuel loaded therein;
• a carrier having a space allowing the lower reactor vessel assembly detached from the reactor vessel to be accommodated therein;
• a rail installed at a bottom of a transfer canal and extended from the reactor area to a fuel handling area;
• a transfer cart horizontally movable along the rail;
• a lifting device installed on the transfer cart, horizontally movable along the rail along with the transfer cart, and movable upward or downward with respect to the transfer cart;
• and
• a drive device configured to supply power to the transfer cart and the lifting device,
• wherein the carrier is assembled on the lifting device to be lifted or lowered via the lifting device, the lower reactor vessel assembly detached from the reactor vessel is accommodated in the carrier, and the carrier is horizontally movable along the rail via the transfer cart,
• wherein the drive device comprises:
• a drive unit installed in the fuel handling area and configured to provide power;
• a first extension stem connected to the drive unit and extending downward of the drive unit;
• a first gear shaft connected to the first extension stem and connected to the transfer cart;
• a second extension stem connected to the drive unit and extending downward of the drive unit;
• and
• a second gear shaft connected to the second extension stem and connected to the lifting device,
• wherein power of the drive unit is transmitted to the transfer cart via the first extension stem and the first gear shaft, and is transmitted to the lifting device via the second extension stem and the second gear shaft.