The accident at Three Mile Island occurred near Harrisburg, Pennsylvania in 1979 and was caused by a mixture of equipment failure and the incapability of plant operators to comprehend the reactor’s state at certain times during the event. A depletion of cooling water to the reactor’s core led to significant melting of the cladding and the uranium fuel, and the release of a minuscule amount of radioactive material. The TMI-2 (Three Mile Island 2) accident was not responsible for any injuries or deaths. TMI-2 was operating at about full power when it automatically shut down after a pump that supplied cooling water quit operating. Pressure and temperature exponentially grew in the reactor, causing a pressure relief valve to unlatch. The valve
