Patent Number: 
Section: claims

1. A rear door system for transferring hot cell equipment into or out of a hot cell, comprising:a rear door configured to be placed on a rear wall of the hot cell, the rear door being movable to open or close the rear wall of the hot cell;a vertical moving table provided at a predetermined position on a lower portion of a front surface of the rear door so as to be movable upwards or downwards;a drive unit provided at a predetermined position in a lower end of the rear door to move the rear door;a stationary working table disposed above the vertical moving table and configured to be fixed to the hot cell in a horizontal orientation;a removable table removably coupled at a predetermined position to the stationary working table;a hot cell crane hook and a service area crane hook; andtwo clamps which are provided at predetermined positions on the respective opposite edges of the rear surface of the rear door for fastening the rear door to the rear wall,wherein guide rails are vertically provided at respective predetermined opposite positions on the lower portion of the front surface of the rear door, and a plurality of rail blocks are provided at each of predetermined opposite positions on a rear surface of the vertical moving table and is coupled on each of the guide rails,wherein a plurality of reinforcing bars is horizontally provided under a lower surface of the removable table at positions spaced apart from each other in a longitudinal direction at predetermined intervals,wherein a magnet is provided on the hot cell crane hook. 2. The rear door system as set forth in claim 1, wherein the vertical moving table comprises: a ball screw provided through an end of the vertical moving table so as to be rotatable; support members provided on respective opposite ends of the ball screw and configured to be fastened at respective predetermined positions to the front surface of the rear door; a ball nut coupled to the ball screw so as to be movable upwards or downwards; a bevel gear provided on a lower end of the ball screw; a shaft gear engaging with the bevel gear in a horizontal direction; a rotating shaft coupled at an end thereof to the shaft gear and provided so as to be rotatable; and a moving table driving motor coupled to the rotating shaft. 3. The rear door system as set forth in claim 1, wherein a receiving space having a predetermined size corresponding to a size of the removable table is formed at a predetermined position through the stationary working table. 4. The rear door system as set forth in claim 1, wherein a plurality of steel plates, which are attracted by magnetic force, is provided in an upper surface of the removable table.