Rotary lock for a control rod drive

Induced nuclear reactions: processes – systems – and elements – With control of reactor – By movement of control element or by release of neutron...

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376242, G21C 714

Patent

active

050698605

ABSTRACT:
A rotary lock is disclosed for preventing rotation of a shaft, such as a shaft used in a control rod drive for a nuclear reactor. The lock includes a stationary housing for receiving the shaft, and an arm extending outwardly from the shaft. At least one pin is joined to the housing for circumferential restraint and is positionable in a withdrawn position away from the arm for allowing the arm to rotate with the shaft without obstruction from the pin. The pin is also positionable in a deployed position contacting the arm for preventing rotation of the arm and shaft. Means are provided for selectivity positioning the pin in the withdrawn and deployed positions.

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