Neutron absorbing bar damping device

Details Neutron absorbing bar damping device Neutron absorbing bar damping device

G - Physics

21

C

359/86

G21C 7/20 (2006.01)

Patent

CA 1270965

ABSTRACT OF THE DISCLOSURE A neutron absorbing bar for use in a PWR has an integrated damping device. It comprises a cluster of vertical absorbant rods fixed to the arms of a spider having a central pommel connectable to a drive mechanism. A damping device in the pommel includes a cylinder slidably receiving a piston urged into a downward projecting position by springs contained in the cylinder. The cylinder and the piston are so formed that the leak flow cross-sectional at area offered to the liquid driven out of the cylinder by the piston decreases gradually as the latter moves from an outermost position. The piston carries a hydromechanical damper damping the initial impact of the bar upon a scram.

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