1979: Equipment malfunction and human error lead to a partial reactor meltdown at the Three Mile Island nuclear power plant near Middletown, Pennsylvania. It is the most serious accident ever involving a U.S. commercial nuclear facility.
Things started going wrong at 4 a.m. when a malfunction caused the main feed-water pumps to stop running, leading to [...]

Source: http://www.wired.com/thisdayintech/2011/03/0328three-mile-island-nuclear-reactor-meltdown/

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