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Three Mile Island accident

28 March 1979 Middletown, Pennsylvania · United States

Three Mile Island accident
Image: Z22 · CC BY-SA 3.0, via Wikimedia Commons
0Deaths
140,000Displaced / homeless
$1bnEstimated cost

A failure in the cooling circuit and a stuck-open valve, misread by the operators, cause a partial meltdown of the Unit 2 reactor core.

Consequences

Human consequences

About 140,000 people leave the area as a precaution.

Environmental consequences

Low radioactive releases; the damaged reactor is permanently shut down.

Economic consequences

Orders for new reactors in the United States collapse in the following years.

Political consequences

Regulation and operator training are tightened. The film The China Syndrome had been released twelve days earlier.

Further reading

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