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

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

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Nuclear Power Engineering
A homogeneous reactor is the one, in which the

All of these
Same substance (e.g. heavy water) is used as moderator & coolant
Fissile atoms are evenly distributed throughout the mass of nuclear reactor
The fuel and the moderator is mixed to form a homogeneous material

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