Nuclear Power Engineering
Molten sodium is used as a coolant in a fast breeder reactor, because of its

Capability to increase the reaction rate in the core
Faster heat removal capability from the core
Neutron breeding capability
Excellent moderating properties

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

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

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