Nuclear Power Engineering
Secondary cooling circuit is a must in molten sodium cooled fast breeder reactor for

Faster heat removal rate from the core
Achieving high degree of superheat in the steam
Lowering the coolant circulation pressure
Avoiding the mixing of water with radioactive sodium, as it may cause explosion

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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
All of these
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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