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Nuclear reactors are devices used to initiate and control a nuclear chain reaction, which generates heat used to produce steam that drives turbines to generate electricity. These reactors harness the energy released from splitting atoms of radioactive materials, such as uranium or plutonium, in a controlled environment. The heat produced in the reactor is used to create steam, which then drives turbines connected to generators to produce electricity. Nuclear reactors are a key component of many countries' energy production infrastructure, providing a significant portion of the world's electricity supply.