Nuclear Power Engineering
Fast breeder reactors do not

Convert fertile material to fissile material
Use molten sodium as coolant
Use fast neutrons for fission
Use Th-232 as fissile fuel

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

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

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