Nuclear Power Engineering
Fast breeder test reactor at Kalpakkam is designed for using

Uranium ore directly as a fuel
U-238 as a fertile material
Thorium as a fertile material
Helium as a coolant

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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
Lowering the coolant circulation pressure
Faster heat removal rate from the core

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