The same thing occurred at a plant outside Toledo, Ohio, a few months before. So it failed, and it failed in the open position and they didn’t know it.” So that instead of sliding freely, it had a tendency to twist.
That was a mistake, an engineering error. You know how you pull on a drawer and, if it’s wider than it is deep, it kind of – well, that valve had been designed that way. According to writer Mike Gray, interviewed for the PBS program American Experience: Meltdown at Three Mile Island, the valve that sat on top of the pressurizer was “like a drawer that’s too wide. On March 28, 1979, America’s worst nuclear accident took place at Three Mile Island – due in large part to a faulty valve that got stuck in the open position.
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