Nuclear Power Engineering
A fast breeder reactor employs

Water as coolant
Molten sodium as coolant as well as moderator
U-235 as fuel
Graphite as moderator

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

Velocity of the secondary neutrons
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

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