Three Mile Island

Three Mile Island is a nuclear power station located in Middletown, Pennsylvania, along the Susquehanna River, just ten miles south of the Pennsylvania state capital Harrisburg, and is also the site of the worst commercial nuclear disaster in United States history that took place on March 28, 1979 (Nuclear Disaster, 1997).

The pilot-operated relief valve (PORV) on the reactor cooling system opened like it was supposed to and then about ten seconds later it should have closed but it remained open, leaking very important reactor coolant water to the reactor coolant drain tank. The operators believed the PORV had shut because instruments showed them that a signal was sent to the valve but they did not have an instrument indicating the valve's actual position. High-pressure injection pumps automatically pushed replacement water into the reactor system (Three Mile Island, 2001). As water and steam escaped through the relief valve, cooling water surged into the pressuriser, raising the water level in it. Operators responded by reducing the flow of replacement water. Their training told them that the pressuriser water level was the only dependable indication of the amount of cooling wat

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