Induced nuclear reactions: processes – systems – and elements – With control of reactor – By movement of control element or by release of neutron...
Patent
1994-08-24
1996-05-14
Walsh, Donald P.
Induced nuclear reactions: processes, systems, and elements
With control of reactor
By movement of control element or by release of neutron...
376228, 376233, 376242, 376234, 376237, G21C 706
Patent
active
055175368
ABSTRACT:
A control rod drive having a magnetic coupling device which eliminates the need for packing-type seal assemblies for preventing leakage from the reactor pressure vessel adjacent the spindle. The magnetic coupling device includes a driving rotor and a driven rotor separated by a pressure barrier which forms part of the reactor pressure boundary. The driven rotor and the driving rotor are coupled magnetically so that the driven rotor rotates in response to rotation of said driving rotor, whereby the control rod displaces in response to operation of the drive motor. The driven and driving rotors are each constructed by stacking a plurality of circular magnetic rings concentric with a centerline axis. Each circular ring has multiple poles circumferentially distributed thereon. An anti-rotation device is incorporated to prevent free rotation of the spindle when the drive motor is removed during maintenance operations. The anti-rotation device includes a push rod actuator which penetrates the pressure barrier. One end of the push rod actuator bears against the drive motor. The other end of the push rod actuator engages a stop lug to block rotation of the spindle when the drive motor is removed.
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Dillmann Charles W.
Goldberg Neal J.
Smith, Jr. Floyd F.
Chelliah Meena
General Electric Company
McGinness James E.
Walsh Donald P.
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