Simple Description

This occurs when one nuclear fission reaction produces neutrons that start the next fission reaction.

Further Detail

Each nuclear fission reaction produces two or more neutrons. These neutrons are then fired into a uranium or plutonium nucleus to start the next reaction. The energy released from these chain reactions is used in a nuclear power station to generate heat energy and then electrical energy.

Related Words:

• Nuclear fission
• Fission
• Uranium
• Plutonium
• Nuclear power station
• Control rods

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