Device for actuating a nuclear reactor control rod

Details Device for actuating a nuclear reactor control rod Device for actuating a nuclear reactor control rod

G - Physics

21

C

359/24

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

Patent

CA 1142658

ABSTRACT OF THE DISCLOSURE A first assembly for low-speed translational displacement and dropping of a control rod comprises a leak-tight casing tube which communicates with the reactor vessel, a screw and nut system coupled to the control rod by means of the nut and a screw-retaining device which is capable of releasing the screw; in the event of accidental rupture of the casing tube, upward displacement of the control rod and of the broken portion of the casing tube is limited by a second assembly comprising a dog-coupling and groove system for rotational locking of the screw drive rotor and calibrated springs for producing action on the rotor in opposition to the vertical thrust produced by rup- ture of the casing tube.

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