Self locking drive system for rotating plug of a nuclear reactor

Details Self locking drive system for rotating plug of a nuclear reactor Self locking drive system for rotating plug of a nuclear reactor

1978-02-23

1979-12-11

Engle, Samuel W.

74425, 176 87, 214 18N, G21C 1920, F16H 116, B66C 1708

Patent

active

041782089

ABSTRACT:
This disclosure describes a self locking drive system for rotating the plugs on the head of a nuclear reactor which is able to restrain plug motion if a seismic event should occur during reactor refueling. A servomotor is engaged via a gear train and a bull gear to the plug. Connected to the gear train is a feedback control system which allows the motor to rotate the plug to predetermined locations for refueling of the reactor. The gear train contains a self locking double enveloping worm gear set. The worm gear set is utilized for its self locking nature to prevent unwanted rotation of the plugs as the result of an earthquake. The double enveloping type is used because its unique contour spreads the load across several teeth providing added strength and allowing the use of a conventional size worm.

REFERENCES:
patent: 2422343 (1947-06-01), Duer
patent: 3143226 (1964-08-01), Cagin
patent: 3252349 (1966-05-01), Widdrington
patent: 3990942 (1976-11-01), Costes
patent: 4047449 (1977-09-01), Popov

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