Nuclear Power Engineering
Heat is generated in a nuclear reactor (thermal) by

Absorption of neutrons in uranium atoms
Fission of U-235 by neutrons
Combustion of a nuclear fuel e.g. uranium
Fusion of atoms of uranium

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

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

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