Nuclear Power Engineering
Use of molten metal as a coolant in fast breeder reactor helps in

Breeding neutrons
Rapid heat transfer from the core
Accelerating the neutrons
Accelerating the reaction rate in the core

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Nuclear Power Engineering
In a pressurised water reactor (PWR), the

Use of moderator is not required
Coolant water boils in the core of the reactor
Fuel is natural uranium and heavy water acts both as moderator & coolant
Coolant water is pressurised to prevent bulk boiling of water in the core

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