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Irradiation-Induced Creep and Re-Sintering of Large Grain Sized UO2 Fuel

  • THEORETICAL AND EXPERIMENTAL PHYSICS OF NUCLEAR REACTORS
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Abstract

A study of irradiation-induced creep and re-sintering of large grain sized fuel of the VVER type was carried out using the developed procedures and experimental facilities under irradiation with fission rates of 1.0 × 1013 and 1.2 × 1013 1/(cm3 s). Strain diagrams generated during creep studies within the strain range of 10−40 MPa were obtained at effective sample temperatures of 943, 1020, 1200 and 1301 K. It was demonstrated that strain is controlled by irradiation-induced creep within the temperature range of up to 1123 K. This was confirmed by its linear dependency on stress. At higher temperatures, the effect of radiation-thermal creep grows, and its contribution to the total strain increases with the growth of stress. Creep rate values obtained at temperatures of 1200 and 1301 K are higher than those of uranium dioxide with standard grain size. Strain diagram produced during the studies of re-sintering of an 88.32 mm high fuel column was obtained at the effective sample temperature of 960 K. In terms of height, re-sintering amounted to 0.070−0.095%. It was demonstrated that irradiation-induced re-sintering did not affect the irradiation-induced creep rate within the experimental accuracy range.

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ACKNOWLEDGMENTS

The authors dedicate this work to the memory of Doctor of Technical Sciences, Professor of National Research Nuclear University MEPhI Malygin V.B., who made a significant contribution to the development of methods and experimental facilities for studying the characteristics of nuclear fuel under reactor conditions.

The work was funded by TVEL JSC.

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Authors and Affiliations

  1. JSC Bochvar High Technology Research Institute of Inorganic Materials (VNIINM), 123098, Moscow, Russia

    E. N. Mikheev, A. V. Fedotov, N. M. Rysev, V. V. Novikov & O. A. Bakhteev

  2. JSC State Scientific Centre, Research Institute of Nuclear Reactors (RIAR), 433510, Dimitrivgrad, Ulyanovsk oblast, Russia

    A. L. Izhutov, A. V. Burukin, S. V. Seredkin & G. A. Ilyinykh

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  1. E. N. Mikheev
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  2. A. V. Fedotov
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  3. N. M. Rysev
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  4. V. V. Novikov
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  5. O. A. Bakhteev
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  6. A. L. Izhutov
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  9. G. A. Ilyinykh
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Correspondence to A. V. Fedotov.

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Mikheev, E.N., Fedotov, A.V., Rysev, N.M. et al. Irradiation-Induced Creep and Re-Sintering of Large Grain Sized UO2 Fuel. Phys. Atom. Nuclei 85 (Suppl 2), S59–S72 (2022). https://doi.org/10.1134/S1063778822140095

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