Nuclear Power Engineering
Secondary cooling circuit is a must in molten sodium cooled fast breeder reactor for

Achieving high degree of superheat in the steam
Avoiding the mixing of water with radioactive sodium, as it may cause explosion
Faster heat removal rate from the core
Lowering the coolant circulation pressure

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

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

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