Nuclear Power Engineering
Fast breeder reactors do not

Use molten sodium as coolant
Convert fertile material to fissile material
Use Th-232 as fissile fuel
Use fast neutrons for fission

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

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

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