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
Achieving high degree of superheat in the steam
Faster heat removal rate from the core

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Nuclear Power Engineering
Plutonium

Is recovered from spent fuel from thermal nuclear reactor
Neither A nor B
Both A & B
Has much lower melting point (640°C ) compared to thorium (1690°C)

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