Nuclear Power Engineering
The main purpose of control rod in a nuclear reactor is to control the

Chain reaction and hence the power output by regulating the number of secondary neutrons causing fission
Conversion of fissile material into fertile material
Emission of hazardous radiation
Velocity of the secondary neutrons

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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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