Nuclear Power Engineering
The disintegration rate of a radioactive element

May increase or decrease depending on the material
Remains constant throughout
Progressively decreases
Progressively increases

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

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

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