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

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
Velocity of the secondary neutrons

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Nuclear Power Engineering
In a pressurised water reactor (PWR), the

Coolant water is pressurised to prevent bulk boiling of water in the core
Coolant water boils in the core of the reactor
Use of moderator is not required
Fuel is natural uranium and heavy water acts both as moderator & coolant

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