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
Fuel is natural uranium and heavy water acts both as moderator & coolant
Coolant water boils in the core of the reactor

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Nuclear Power Engineering
Water is a better coolant than a gas (like COâ‚‚, He, Nâ‚‚ etc.), because it

Has a better heat transfer characteristics, and it can be pressurised to attain a high temperature
Is a better neutron moderator as well
All of these
Requires comparatively smaller pumps and heat exchanger for a given heat transfer rate

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