PASSIVE SHUTDOWN SEALING DEVICE FOR A SYSTEM OF SHAFT SEALS IN A REACTOR COOLANT PUMP SET
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United States of America Patent
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Issued Date -
Jul 9, 2015
app pub date -
Jun 25, 2013
filing date -
Jun 25, 2012
priority date (Note) -
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Abstract
The present invention concerns a passive shutdown sealing device (20) for a primary motorised pump unit comprising: a split sealing ring (23) having an inactivated position and an activated position; a separator (27) made from a fusible material capable of changing state from a temperature threshold, called state change threshold, said separator (27) holding said split sealing ring (23) in the inactivated position of same when the temperature of the device (20) is lower than said state change temperature threshold; said device being characterised in that it comprises circular elastic means (22) positioned around the split sealing ring (23), said elastic means (22) being designed to bring said sealing ring (23) into the activated position of same when the temperature is greater than or equal to the state change threshold value of said separator (27).
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