Nuclear Power Engineering
A fast breeder reactor employs

Graphite as moderator
Molten sodium as coolant as well as moderator
Water as coolant
U-235 as fuel

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

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