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

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

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

Lowering the coolant circulation pressure
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

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