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

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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
Melting point, hence can be subjected to higher temperature
Resistance to effects of irradiation

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