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

It is difficult to initiate fusion reaction
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

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Nuclear Power Engineering
An ideal coolant for a nuclear reactor should

Be a good absorber of neutrons
Be free from radiation damage and non-corrosive
Be capable of attaining high temperature, only when it is pressurised
Have high density, but low heat transfer co-efficient

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