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meltdown
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damage at Fukushima Daiichi power plant
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damage at Fukushima Daiichi power plant
damage at Fukushima Daiichi power plant Two of the damaged containment buildings at the Fukushima Daiichi nuclear power plant, northeastern Fukushima prefecture, Japan, several days after the March 11, 2011, earthquake and tsunami that crippled the installation.

meltdown

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meltdown, occurrence in which a huge amount of thermal energy and radiation is released as a result of an uncontrolled chain reaction in a nuclear power reactor. The chain reaction that occurs in the reactor’s core must be carefully regulated by control rods, which absorb neutrons, and a moderator, which reduces their energy. If the core becomes too hot, it can melt, releasing large amounts of radiation. See also Three Mile Island accident of 1979, Chernobyl accidentof 1986, and Fukushima accident of 2011.

The Editors of Encyclopaedia BritannicaThis article was most recently revised and updated by William L. Hosch.