Nuclear Power Engineering
Fast breeder test reactor at Kalpakkam is designed for using

Thorium as a fertile material
Uranium ore directly as a fuel
U-238 as a fertile material
Helium as a coolant

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

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