Author:
Ushakov S. V.,Burakov B. E.,Shabalev S. I.,Anderson E. B.
Abstract
ABSTRACTA summary of the results collected during the studies of the products of a
chemical interaction between uranium oxide fuel and Zircaloy cladding in the
Chernobyl accident is presented in this paper. The reaction products are
mainly Zr-U-containing phases with different U/Zr ratio and are described on
the basis of electron microprobe and X-ray diffraction (XRD) analyses. The
Zr-U-bearing phases were discovered among the inclusions in different types
of Chernobyl fuel-containing masses (”lava”) inside the destroyed 4th Unit
and in hot particles collected up to 12 km from the 4th Unit along the West
Plume. A correlation of data on the chemical composition and phase
interrelations obtained in investigated samples with a phase diagram of
Zr(O) - UO2 shows, that a temperature >1900 °C was reached in
a part of the core before the explosion. The detection of hot particle with
segregated morphology points out that liquid immiscibility existed between
U-rich and Zr-rich melts. This and other observations indicate that the core
temperature locally was above 2400–2600°C.
Publisher
Springer Science and Business Media LLC
Reference6 articles.
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