How coolant flow is maintained in the event of loss of power to the PHT system?

How coolant flow is maintained in the event of loss of power to the PHT system?
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1 Answer

Answer :

When the PHT power fails, it takes two minutes for DG to come to full power. The circulation is maintained by flywheel, which increases the de-acceleration and maintains the flow for two minutes. If there is a station blackout the flow is maintained by thermo-symphoning by which more denser cold water comes down and less denser hot water goes up by convection method. 
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