Nuclear Power Engineering
The electric power generation cost in nuclear power plant is less than that in a coal based thermal power plant, mainly because the

None of these
Thermal efficiency of the former is higher
Fuel cost per unit power generated is less
Maintenance cost of the former is less

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Nuclear Power Engineering
Water is a better coolant than a gas (like CO₂, He, N₂ etc.), because it

Requires comparatively smaller pumps and heat exchanger for a given heat transfer rate
Has a better heat transfer characteristics, and it can be pressurised to attain a high temperature
Is a better neutron moderator as well
All of these

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