Patent Number: 
Section: claims

1. A device for capturing a shielding ball for a heavy water reactor, comprising:a head for separating shielding balls positioned inside an end shield of a calandria of a heavy water reactor to an outside of the end shield; anda mover for moving the head to the end shield of the calandria,wherein the head includesa head body,an opening former installed on the head body and configured to cut the end shield for creating an opening in the end shield, anda gate installed on the head body and configured to control an amount of the shielding balls discharged to the outside through the opening. 2. The device of claim 1, further comprisinga camera installed in the head body and setting coordinates of the opening former. 3. The device of claim 2, whereinthe gate has an aperture of which size is controllable. 4. The device of claim 2, whereinthe gate is slidable to control the amount of the shielding balls discharged to the outside. 5. The device of claim 2, whereina lower portion of the head body is installed to be inclined, andthe lower portion is movable to control a tilt angle of the lower portion. 6. The device of claim 3, further comprisinga sealer positioned on a front portion of the head body and and configured to contact the end shield for sealing. 7. The device of claim 3, whereinthe mover includes:a capture unit for capturing the shielding ball; anda transfer unit for moving the capture unit.