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

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
Coolant water boils in the core of the reactor

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Nuclear Power Engineering
An ideal coolant for a nuclear reactor should

Be free from radiation damage and non-corrosive
Be capable of attaining high temperature, only when it is pressurised
Be a good absorber of neutrons
Have high density, but low heat transfer co-efficient

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