The results of an investigation of the stored energy in GR-280 graphite irradiated at 560°C to neutron fluence ~3·1026 m–2 are presented. The measurements were performed by means of differential scanning calorimetry with constant heating rate 20°C/min. The release of the stored energy reaches a maximum at annealing temperature 1100°C. The maximum output is equal to 0.34–0.48 J/(g·°C). The total stored energy released in the annealing temperature range 560–1300°C does not exceed 183 J/g. A kinetic analysis of the spectrum of the stored energy was performed. This analysis established that increasing the radiation temperature from 450 to 560°C results in almost complete vanishing of individual vacancies, redistribution of the migration of di-vacancies, and evolution of a cluster structure upon post-radiation annealing in the range 560–1300°C in the direction of processes with lower activation energy.
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Translated from Atomnaya Énergiya, Vol. 125, No. 3, pp. 172–175, September, 2018.
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Belan, E.P., Khar’kov, D.V. & Avdonin, A.V. Investigation of the Character of Stored-Energy Release from Graphite Irradiated at High Temperature. At Energy 125, 194–197 (2019). https://doi.org/10.1007/s10512-018-00465-2
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DOI: https://doi.org/10.1007/s10512-018-00465-2