Control rod ejection retardation assembly

Details Control rod ejection retardation assembly Control rod ejection retardation assembly

G - Physics

21

C

359/36

G21C 7/08 (2006.01) G21C 7/12 (2006.01) G21C 9/00 (2006.01)

Patent

CA 1068416

CONTROL ROD EJECTION RETARDATION ASSEMBLY ABSTRACT OF THE DISCLOSURE A control rod ejection retardation assembly is mounted to a control rod assembly of a nuclear reactor to retard the ejection of the control rod only during an undesired ejection of the con- trol rod while allowing normal control rod movement and "scram- ming" operation to be drag free and unretarded. The ejection retardation assembly includes a piston assembly mounted to the control rod and having an opening thereto controlled by a ball valve. The piston assembly seals are made loose fitting to allow sufficient fluid flow through the seals to provide unhindered normal control rod movement even with the ball valve sealing the piston assembly opening. During undesired speedy ejection of the control rod, the ball valve seals the opening to prevent fluid flow to the piston assembly retarding piston movement and thereby controlling control rod movement. During a "scram" con- dition the ball valve unseals the piston opening allowing fluid to easily flow into the piston assembly to prevent any retarda- tion of piston and control rod movement.

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