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The accident that occurred in 1978 at Unit 2 of the Three Mile Island nuclear power plant (TMI-2) provided a unique opportunity to improve our understanding of severe accidents based on an actual severe accident in an operating commercial nuclear power plant. The TMI-2 Accident Evaluation Program was originally set up by the US Department of Energy, then part of the program was later broadened into an international collaboration project under the aegis of the OECD Nuclear Energy Agency (NEA). It became apparent after the program had been established that the TMI-2 accident had progressed further than believed. The new program was designed to evaluate the potential modes of failure and the margin to failure to the TMI-2 reactor vessel during the TMI-2 accident. The condition and properties of material extracted from the lower head of the TMI-2 reactor pressure vessel were investigated to determine the temperature conditions and the extent of the damage by chemical and thermal attack on the lower head, as well as the margin of structural integrity of the vessel during the accident. The forum discussed these aspects of the TMI-2 accident.