Monitor circuit for a control rod drive mechanism

Details Monitor circuit for a control rod drive mechanism Monitor circuit for a control rod drive mechanism

1980-05-15

1982-12-14

Cangialosi, Sal

Induced nuclear reactions: processes, systems, and elements

With control of reactor

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

376258, 376245, 376215, G21C 1700, G21C 708

Patent

active

043637787

ABSTRACT:
A monitor circuit for a control rod drive mechanism (CRDM) that is adapted to detect erroneous stator phase sequences and generate a visible and audible alarm. The monitor circuit has particular application for use in connection with the control element assembly of a nuclear reactor. The monitor circuit includes an interface circuit for each stator phase winding of the drive motor, a plurality of logic gates to detect the predetermined erroneous phase sequences, a plurality of flip-flops to maintain the fault condition signal, visible and audible alarm circuits, and circuitry for resetting the monitor circuit after a fault condition. The monitor circuit also includes a ratchet trip circuit for disengaging the clutch mechanism from the control rods when the rods are in motion in the time a fault condition is detected.

REFERENCES:
patent: 4028686 (1977-06-01), Wilson et al.
patent: 4034277 (1977-07-01), Leenhouts
patent: 4054486 (1977-10-01), Lefebvre et al.
patent: 4103233 (1978-07-01), Timmermanns et al.
patent: 4125432 (1978-11-01), Brooks, Jr. et al.
patent: 4170754 (1979-10-01), Schmitz et al.
patent: 4201940 (1980-05-01), Pardenne

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