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

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

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Nuclear Power Engineering
An ideal coolant for a nuclear reactor should

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

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