AM the chain of events that would cause the partial meltdown of one of Three Mile Island's nuclear reactors unfolded. At the time Three Mile Island was managed by the Metropolitan Edison Power Company and the Vice President being Jack Herbein. At Three Mile Island Nuclear Generating Station in Dauphin County, PA the secondary cooling system on unit 2 malfunctioned. This caused the temperature in the primary coolant to rise. A series of valve malfunctions lead operators to believe that the coolant water was full, so they stopped pumping replacement water. Because a valve was stuck open water was boiling away and exposed the fuel core raising its temperature. The fuel rods became damaged and released radioactive material into the water. Following this there was a partial release of radioactive gases. There was a recommended voluntary evacuation of people within a five mile radius of the reactor which was later extended to a twenty mile radius. Following the accident there were protests to stop operations at Three Mile Island.