Nuclear Power Engineering
The specific heats of three gaseous coolants namely H₂, He and CO₂ in the increasing order are

H₂, He, CO₂
CO₂, H₂, He
H₂, CO₂, He
CO₂, He, H₂

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

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

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