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

Coolant water is pressurised to prevent bulk boiling of water in the core
Use of moderator is not required
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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Nuclear Power Engineering
A control rod

Both B and C
Should have small absorption cross-section
Is generally made of boron, hafnium or cadmium
Should have large absorption cross-section

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