Nuclear Power Engineering
Commercial power generation from fusion reactor is not yet possible, because

It is difficult to initiate fusion reaction
It is difficult to control fusion reaction
The fuel required (e.g. deuterium and tritium) is scarce
Quantity of fuel required for initiating fusion reaction is prohibitively high

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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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