Three Mile Island Historical Marker

Three Mile Island Historical Marker

Early on the morning of March 28, 1979, a series of failures at the Three Mile Island nuclear power plant led to a partial meltdown that released radioactive gases and radioactive iodine into the atmosphere. The accident began with failures in the non-nuclear secondary system, followed by a pilot-operated relief valve that was stuck in the open position, which resulted in large amounts of water escaping from the pressurized isolated coolant loop…

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