Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1979-05-15
1981-02-24
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
7386108, 176 20R, 176 22, 328148, 340527, 340609, G08B 2100, G01P 1300, G21C 1702
Patent
active
042530938
ABSTRACT:
A scram signal generating circuit for nuclear reactor installations monitors a flow signal representing the flow rate of the liquid sodium coolant which is circulated through the reactor, and initiates reactor shutdown for a rapid variation in the flow signal, indicative of fuel motion. The scram signal generating circuit includes a long-term drift compensation circuit which processes the flow signal and generates an output signal representing the flow rate of the coolant. The output signal remains substantially unchanged for small variations in the flow signal, attributable to long term drift in the flow rate, but a rapid change in the flow signal, indicative of a fast flow variation, causes a corresponding change in the output signal. A comparator circuit compares the output signal with a reference signal, representing a given percentage of the steady state flow rate of the coolant, and generates a scram signal to initiate reactor shutdown when the output signal equals the reference signal.
REFERENCES:
patent: 3594557 (1971-07-01), Anderson
patent: 3602826 (1971-08-01), List et al.
Johanson Edward W.
Simms Richard
Caldwell Sr. John W.
Denny James E.
Jackson Frank H.
Myer Daniel
Reynolds Donald P.
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