Nuclear Power Engineering
A fertile material is the one, which can be

Fissioned by fast neutrons
Converted into fissile material on absorption of neutron
Fissioned by either slow or fast neutrons
Fissioned by slow (thermal) neutrons

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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
Lowering the coolant circulation pressure
Faster heat removal rate from the core
Achieving high degree of superheat in the steam

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