Nuclear Power Engineering
Heavy water is preferred over ordinary water as a coolant, because it.

Acts both as an efficient coolant as well as a moderator
Is less prone to radiation damage
All of these
Can be heated to a higher temperature without pressurizing

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

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

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