Nuclear Power Engineering
Ordinary water is not used as a moderator because, it

Absorbs neutrons
Has a low scattering cross-section
Has a low absorption cross-section
Does not absorb 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
Fuel is natural uranium and heavy water acts both as moderator & coolant
Coolant water boils in the core of the reactor

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