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Modification of Recrystallization Temperature of Uranium Dioxide in Function of Burn-Up and Its Impact on Fission Gas Release

100%
Szuta M., El-Koliel M.
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vol. 96
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issue 1
143-151
EN
In the present paper it is assumed that the recrystallization temperature of uranium dioxide decreases with burn-up. Two opposing effects of enhancement and inhibition of irradiation damage introduced by fission effect on grain growth are described. Mathematical model of fission gas release from the UO_{2} fuel affected by grain growth is presented. Theoretical results are compared with the experimental data.
2
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Influence of Thin Surface Layer on Fission Gas Release from Uranium Dioxide Single Crystal during Irradiation

100%
Szuta M.
Acta Physica Polonica A
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1996
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vol. 89
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issue 3
451-455
EN
In the present paper it is assumed that in the fluence range of 4×10^{19} - 0.5×10^{21} fissions/cm^{3} the main contribution to the fission gas release from an uranium dioxide single crystal is from the bubble traps by knock-out process. An analysis of bubble distribution in the single crystal for different temperatures shows that some experimental peculiarities of the fission gas release during irradiation arise from different conditions of the thin surface layer and the interior of the considered solid. The thin surface layer is assigned by the fission fragment range.
3
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Formation of Nanostructures in UO_2 Fuel at High Burn-ups

100%
Szuta M., Bocar I.
Acta Physica Polonica A
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2002
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vol. 102
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issue 2
207-213
EN
In the present paper it is assumed that above a limiting value of fission fluency (burn-up) a more intensive process of irradiation induced chemical interaction occurs. A significant part of fission gas product is thus expected to be chemically bounded in the matrix of UO_2 fuel. The fission gas atoms substituting, for example, uranium atoms in the crystallographic lattice can form weak facets. At a certain saturation condition, division of the grains can occur at the weak facets and the increase in fission-gas-products release may be expected. The fact that the process of grain division for high burn-ups (70-80 MWd/kgU) forms an extremely fine structure up to a temperature as high as 1100^ºC and simultaneously the observed decrease in fission gas concentration in the fuel supports this concept. The analysis of fission gas concentration change due to the formation of nanostructures in UO_2 fuel at high burn-ups in terms of total surface area change in a function of burn-up and knock-out process is presented.
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