Thermally responsive trigger devices and their use in shut-down devices for nuclear reactors
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United States of America Patent
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Sep 24, 1991
Issued Date -
N/A
app pub date -
Dec 26, 1989
filing date -
Jan 28, 1982
priority date (Note) -
Expired
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Abstract
A thermally responsive trigger device comprises a closed bellows (14) having a filling of liquid metal and acting on a trigger (19) responsive to the free end of the bellows. The bellows and trigger are located at a temperature measuring location which is the coolant flow outlet (15) from a demountable sub-assembly vehicle (10) having a fuel unit (11) and a triggerable absorber unit (12). The outlet flowing coolant sweeps over the bellows (14) and once the expansion of the bellows exceeds a threshold a pin (26) and cam (28) at the free end of the bellows causes a plate (21) to move to release the absorber unit (12).
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