Nuclear Power Engineering
Fast breeder test reactor at Kalpakkam is designed for using

Uranium ore directly as a fuel
U-238 as a fertile material
Thorium as a fertile material
Helium as a coolant

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

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

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