Nuclear Power Engineering
A fast breeder reactor employs

Water as coolant
U-235 as fuel
Graphite as moderator
Molten sodium as coolant as well as moderator

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

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

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