Nuclear Power Engineering
Heavy water is used as a moderator in a

Candu reactor
Molten sodium cooled reactor
Boiling water reactor (BWR)
Pressurised water reactor (PWR)

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

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