Nuclear Power Engineering
Heat is generated in a nuclear reactor (thermal) by

Fission of U-235 by neutrons
Fusion of atoms of uranium
Combustion of a nuclear fuel e.g. uranium
Absorption of neutrons in uranium atoms

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Nuclear Power Engineering
A control rod

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

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