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

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

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Nuclear Power Engineering
Molten sodium (as a coolant in fast breeder reactor)

Is highly radioactive at elevated temperatures and can cause explosion, when it comes in contact with air or water
None of these
Is not at all corrosive, even at a higher temperature
Can't attain high temperature at normal pressure

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