Nuclear Power Engineering
Heat is generated in a nuclear reactor (thermal) by

Fusion of atoms of uranium
Absorption of neutrons in uranium atoms
Combustion of a nuclear fuel e.g. uranium
Fission of U-235 by neutrons

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

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

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