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Nuclear power plants consist mainly of four parts:

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Nuclear power plants consist mainly of four parts:

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1. The nuclear reactor, where the nuclear reaction takes place.
2. The steam generator (PWR type only).
3. The steam turbine, which moves an electric generator to produce electricity with steam expansion.
4. The condenser, a heat exchanger that cools the steam back into liquid.

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The radiation has a cumulative effect. The longer a person is exposed to radiation, the greater the effect. High radiation exposure can lead to serious illness and death.

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The radiation has a cumulative effect. The longer a person is exposed to radiation, the greater the effect. High radiation exposure can lead to serious illness and death.

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The potential danger of an accident at a nuclear power plant is exposure to radiation. This exposure could be caused by the release of radioactive material from the plant to the environment, which is generally characterized by a cloud of radioactive particles and gases. The greatest risk to people in the vicinity of this cloud is the exposure of the body to the radiation of the cloud and particles deposited in the ground, and the inhalation and ingestion of radioactive material.

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Nearly 3 million Americans live within 10 miles (16 km) of an active nuclear power plant.

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Nuclear power plants use heat generated from nuclear fission in a contained environment to convert water into steam, which provides power to generators to produce electricity. There are active nuclear power plants in many states of the country and produce about 20% of the nation's electricity.

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The nuclear power plant in Cattenom, east of France.

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The nuclear power plant in Cattenom, east of France.

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The Chernobyl disaster, also referred to as the Chernobyl accident, was a catastrophic nuclear accident that occurred on 26 April 1986 in the No.4 light water graphite moderated reactor at the Chernobyl Nuclear Power Plant near Pripyat, in what was then part of the Ukrainian Soviet Socialist Republic of the Soviet Union (USSR).