Nuclear Power Engineering
'Heavy water' is termed as 'heavy' because it is

An oxide of deuterium
Denser than water
An oxide of heavier isotope of oxygen
A heavy liquid

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

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

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