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 free from radiation damage and non-corrosive
Be a good absorber of neutrons

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Nuclear Power Engineering
Nuclear fuel generally used in reactors is uranium oxide instead of uranium, because the former has higher

Melting point, hence can be subjected to higher temperature
Resistance to effects of irradiation
Density ; hence core volume for a given power output would be smaller
All of these

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