Nuclear Power Engineering
A thermal nuclear reactor compared to a fast breeder reactor

Gives higher power density
Uses faster neutrons for fission
Requires less fuel to run at the same power level
Uses slower neutrons for fission

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

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