PASSIVE SHUTDOWN SEALING DEVICE FOR A SYSTEM OF SHAFT SEALS IN A REACTOR COOLANT PUMP SET

摘要

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).

主权项

1. A passive shutdown sealing device (20) for a reactor coolant pump shaft seal system, comprising:
a split sealing ring with an inactive position and an active position; a separator made from a fusible material capable of changing state above a temperature threshold called the state change threshold, said separator holding said split sealing ring in its inactive position when the temperature of the device is less than the threshold state change temperature;circular elastic means positioned around the split sealing ring, said elastic means being adapted to bring said sealing ring into its active position when the temperature is greater than or equal to the threshold change state value of said separator.