Nuclear Power Engineering
Artificially produced radioactive isotopes are used for

Treatment of certain diseases
All of these
Power generation
Initiating nuclear fission and fusion

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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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