Irradiation-Induced Creep and Re-Sintering of Large Grain Sized UO2 Fuel
https://doi.org/10.56304/S2079562922050591
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 radiation 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 mainly determined 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 specimen temperature of 960 K. In terms of height, re-sintering amounted to 0.070−0.095%. It was showed that, within the limits of the experimental error, irradiation-induced re-sintering makes a small contribution to the resulting strain of the fuel in comparison with creep.
About the Authors
E. N. Mikheev
JSC Bochvar High Technology Research Institute of Inorganic Materials (VNIINM)
Russian Federation
Russian Federation
Moscow, 123098
A. V. Fedotov
JSC Bochvar High Technology Research Institute of Inorganic Materials (VNIINM)
Russian Federation
Russian Federation
Moscow, 123098
N. M. Rysev
JSC Bochvar High Technology Research Institute of Inorganic Materials (VNIINM)
Russian Federation
Russian Federation
Moscow, 123098
V. V. Novikov
JSC Bochvar High Technology Research Institute of Inorganic Materials (VNIINM)
Russian Federation
Russian Federation
Moscow, 123098
O. A. Bakhteev
JSC Bochvar High Technology Research Institute of Inorganic Materials (VNIINM)
Russian Federation
Russian Federation
Moscow, 123098
A. L. Izhutov
JSC State Scientific Centre, Research Institute of Nuclear Reactors (RIAR)
Russian Federation
Russian Federation
Dimitrivgrad, Ulyanovsk oblast, 433510
A. V. Burukin
JSC State Scientific Centre, Research Institute of Nuclear Reactors (RIAR)
Russian Federation
Russian Federation
Dimitrivgrad, Ulyanovsk oblast, 433510
S. V. Seredkin
JSC State Scientific Centre, Research Institute of Nuclear Reactors (RIAR)
Russian Federation
Russian Federation
Dimitrivgrad, Ulyanovsk oblast, 433510
G. A. Ilyinykh
JSC State Scientific Centre, Research Institute of Nuclear Reactors (RIAR)
Russian Federation
Russian Federation
Dimitrivgrad, Ulyanovsk oblast, 433510
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Review
For citations:
Mikheev E.N., Fedotov A.V., Rysev N.M., Novikov V.V., Bakhteev O.A., Izhutov A.L., Burukin A.V., Seredkin S.V., Ilyinykh G.A. Irradiation-Induced Creep and Re-Sintering of Large Grain Sized UO2 Fuel. Nuclear Physics and Engineering. 2023;14(5):419-433. (In Russ.) https://doi.org/10.56304/S2079562922050591
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