Control rod

Nuclear Energy

Neutron-absorbing rod for reactor control.

Control rods contain strong neutron absorbers such as boron, cadmium, or hafnium. Inserting them reduces reactivity; withdrawing them increases it.

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Articles

Control and Reaction States

The chain fission reaction in a nuclear reactor is controlled by the neutron absorber content. The reactor can be subcritical, critical, or supercritical.

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Glossary

Absorber

Material that captures neutrons.

Scram

Rapid emergency shutdown of a reactor.