Nuclear Power Engineering
Heavy water is used as a moderator in a

Candu reactor
Boiling water reactor (BWR)
Molten sodium cooled reactor
Pressurised water reactor (PWR)

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Nuclear Power Engineering
Water is a better coolant than a gas (like CO₂, He, N₂ etc.), because it

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

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