Nuclear Power Engineering
A control rod

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

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

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

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