Shock absorbing drive mechanism for nuclear reactor absorbing ba

Details Shock absorbing drive mechanism for nuclear reactor absorbing ba Shock absorbing drive mechanism for nuclear reactor absorbing ba

1989-02-10

1990-10-09

Behrend, Harvey E.

Induced nuclear reactions: processes, systems, and elements

With control of reactor

By movement of control element or by release of neutron...

G21C 720

Patent

active

049618970

ABSTRACT:
A drive mechanism for a neutron absorbing bar of a liquid cooled nuclear reactor has a drive shaft movable within upper internals and a shock absorber. The shock absorber has a hydraulic cylinder arranged to bear on the upper internals, formed with a bore comprising an upper portion of larger diameter provided with discharge holes spaced longitudinally along the bore and with a lower portion of smaller diameter, a piston, movable within and along the cylinder, having a diameter corresponding to that of the upper portion and defining a shock absorbing chamber with the upper portion, the chamber having exhaust means comprising the discharge holes located to be progressively covered by the piston during downward movement thereof within the cylinder, and a resetting spring biasing the piston towards a top position where it uncovers the discharge holes. The shaft passes through the piston and is arranged for forcing the piston down into the cylinder upon downward movement of the shaft in the upper internals beyond a predetermined level.

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