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Irradiations of uranium dioxide, UO(2) with different swift heavy ions were performed using wide ranges of energies and fluencies from 72 MeV to 2.7 GeV in the range 5 x 109-1017 ions/cm(2). The ions were Zn, Mo, Cd, Sn, Xe, I, Pb, Au and U. The threshold energy loss for formation of visible tracks in UO(2) could be determined to be in the range of 22-29 keV/nm. Fission products of fission energy are below this threshold but nevertheless form thermal spikes in U(2). Observable tracks are only found at the surface. By using (127) I-beams of 72 MeV energy the consequences of fission product impact, i.e., lattice parameter increase, fission gas bubble formation, resolution of fission gas from bubbles and fission-enhanced diffusion were all observed and measured. The swelling of UO(2) was confirmed to be small and the technologically important process of polygonization (grain subdivision, also called rim-effect in operating UO(2)-fuel) could be simulated. The results obtained are important in understanding the operating behaviour of UO(2), today's fuel in nuclear electricity-producing power stations.

Additional information

Authors: MATZKE H.J, ITU, Karlsruhe (DE);WISS T, ITU, Karlsruhe (DE);LUCUTA P.G, ACERAM Industries, Kingston, Ontorio (CA)
Bibliographic Reference: Oral Report: 10th International Conference on Radiation Effects In Insulators, Jena (DE) 19-23 July (1999)
Availability: 1 as paper EN 60447 ORA
Record Number: 200012837 / Last updated on: 2000-11-07
Original language: en
Available languages: en
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