Induced nuclear reactions: processes – systems – and elements – Control component for a fission reactor – Fuse actuated devices
Patent
1981-06-04
1988-09-13
Behrend, Harvey E.
Induced nuclear reactions: processes, systems, and elements
Control component for a fission reactor
Fuse actuated devices
376230, 376243, 376321, 313310, 310306, 374174, 337306, G21C 700, G01K 700
Patent
active
047708450
ABSTRACT:
A control system for the automatic or self-actuated shutdown or "scram" of a nuclear reactor. The system is capable of initiating scram insertion by a signal from the plant protection system or by independent action directly sensing reactor conditions of low-flow or over-power.
Self-actuation due to a loss of reactor coolant flow results from a decrease of pressure differential between the upper and lower ends of an absorber element. When the force due to this differential falls below the weight of the element, the element will fall by gravitational force to scram the reactor.
Self-actuation due to high neutron flux is accomplished via a valve controlled by an electromagnet and a thermionic diode. In a reactor over-power, the diode will be heated to a change of state causing the electromagnet to be shorted thereby actuating the valve which provides the changed flow and pressure conditions required for scramming the absorber element.
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Barrus Donald M.
Brummond Willian A
Peterson Leslie F.
Behrend Harvey E.
Carnahan L. E.
Gaither Roger S.
Hightower Judson R.
The United States of America as represented by the United States
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