Nuclear Power Engineering
An ideal coolant for a nuclear reactor should

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

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

The fuel required (e.g. deuterium and tritium) is scarce
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

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