Nuclear Power Engineering
An ideal coolant for a nuclear reactor should

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

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

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
Fuel is natural uranium and heavy water acts both as moderator & coolant

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