STUDY OF THE ANNEALING EFFECT ON THE DEFECT STRUCTURE OF NEUTRON IRRADIATED PURE IRON BY THE CLUSTER DYNAMICS METHOD

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O. R. Gokhman
L. V. Zagorulko
T. S. Sovkova

Abstract

For WWER-1000 reactors, which are the basis of Ukraine's nuclear energy, to date, the possibility of restoring irradiated vessel steel has not been fully studied, in particular, temperature-time annealing regimes have not been developed. This article is devoted to this problem. The effect of annealing on the evolution of defect clusters formed in commercially pure iron C <30 ppm), which was irradiated in a Belgian reactor BR2 at 300 ° C with neutrons with a flux of 1.39 × 10−7 dpa / s   (9×1017n2/с, E > 1 МеВ) to a dose of 0,026 dpa (1,7 ×1019n2, E > 1МеВ), has been studied by cluster dynamics method. The temperature and annealing time varied in the range (300 0С-500 0С) and (2 hours -1 day), respectively. The cluster dynamics master equation was written as a system of ordinary differential equations with respect to the numerical density of isolated vacancies (V) and interstitials (SIA) and their clusters (VC) and (SIAC), assuming that only V and SIA are mobile. Formation energies, migration energies, pre-exponential coefficients for V and SIA, vacancy and interstitial dimers binding energies, V-SIA recombination radius were preliminarily determined from the best coincidence between computer simulation data and experimental data. A conclusion was made about the optimal temperature and duration of annealing to restore the defect structure of neutron irradiated pure iron.

Article Details

Section
Materials Physics
Author Biographies

O. R. Gokhman, South Ukrainian Pedagogical University named after K.D. Ushynsky 65020 Odesa, Ukraine

Professor, Department of Physics, South Ukrainian
Pedagogical University named after K.D. Ushynsky
65020 Odesa, Ukraine

L. V. Zagorulko, South Ukrainian Pedagogical University named after K.D. Ushynsky 65020 Odesa, Ukraine

PhD student, Department of Physics, South Ukrainian
Pedagogical University named after K.D. Ushynsky
65020 Odesa, Ukraine

T. S. Sovkova, South Ukrainian Pedagogical University named after K.D. Ushynsky 65020 Odesa, Ukraine

Associated Professor, Department of Physics, South Ukrainian
Pedagogical University named after K.D. Ushynsky
65020 Odesa, Ukraine