Nuclear Power Engineering
A fertile material is the one, which can be

Converted into fissile material on absorption of neutron
Fissioned by slow (thermal) neutrons
Fissioned by fast neutrons
Fissioned by either slow or fast neutrons

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

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

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