Passive shutdown sealing device for a system of shaft seals of a reactor coolant pump set
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United States of America Patent
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Aug 20, 2019
Grant Date -
Apr 23, 2015
app pub date -
Jan 31, 2013
filing date -
Feb 1, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention relates to a passive shutdown sealing device (20) for a reactor coolant pump unit comprising: a split sealing ring (23) having an inactivated position in which a leakage flow is permitted and an activated position in which said ring stops said leakage flow; at least one piston (22) designed to position said split sealing ring (23) in its activated position; locking/unlocking means (25) designed to lock said at least one piston (22) in its inactivated position when the temperature of said locking/unlocking means is below a temperature threshold and to release said at least one piston (22) when the temperature of said locking/unlocking means is above said temperature threshold; elastic means (24) designed to move said at least one piston (22) when said piston is released, so as to position said sealing ring (23) in its activated position.
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