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        Part of American Experience
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        Three Mile Island: What Happened

        A nuclear power plant has a great margin of error. By design, when one system fails, another takes over. However, as this interactive activity from the AMERICAN EXPERIENCE Web site explains, there is no such thing as "fail-safe". Learn how a chain of malfunctions and operator errors led to the worst nuclear accident in U.S. history, and how disaster was ultimately averted.

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