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The TMI-2 Accident Evaluation Programme was set up by the US Department of Energy to examine samples taken from the damaged reactor core. Samples were extracted from: (i) the completely melted down inner core; (ii) the surrounding crust (upper and lower zones); (iii) pieces of debris lying on top of the upper crust; (iv) fuel rod segments taken from the edge of the pile. These samples were polished and examined by optical and electron-optical microscopy with supporting analysis by energy dispersion (EDX) and wavelength dispersion (microprobe). Additional techniques such as gamma-spectroscopy, X-ray diffraction and fission product release experiments were also employed. The final material compositions give a good indication of the mechanisms involved and the temperatures reached during meltdown.

Additional information

Authors: BOTTOMLEY P D W, JRC Karlsruhe (DE)
Bibliographic Reference: Paper presented: 23. Journées des Actinides, Bühlerhöhe (DE), April 20-23, 1993
Availability: Available from (1) as Paper EN 37665 ORA
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