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

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

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

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