Nuclear Power Engineering
Use of molten metal as a coolant in fast breeder reactor helps in

Accelerating the neutrons
Accelerating the reaction rate in the core
Rapid heat transfer from the core
Breeding 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

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

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