Nuclear Power Engineering
Use of molten metal as a coolant in fast breeder reactor helps in

Rapid heat transfer from the core
Accelerating the reaction rate in the core
Breeding neutrons
Accelerating the neutrons

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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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