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<p>Cr-doped UO₂ fuels are increasingly adopted for their superior in-reactor performance compared to undoped UO₂, but their spent fuel behaviour, particularly potential Cr speciation and fission product reactivity, remains poorly understood. This investigation has used high energy resolution fluorescence detected X-ray absorption near edge structure (HERFD-XANES) spectroscopy to examine speciation of Cr and Pr/Gd within 200 ppm Cr-doped (U<sup>4.4+</sup><sub>0.7</sub>Pr<sup>3+</sup><sub>0.3</sub>)O<sub>2-x</sub> and 200 ppm Cr-doped (U<sup>4.4+</sup><sub>0.7</sub>Gd<sup>3+</sup><sub>0.3</sub>)O<sub>2-x</sub> compounds. Despite both being UO<sub>2</sub> soluble and undersaturated, analysis indicates that Cr<sup>3+</sup> and Pr<sup>3+</sup>/Gd<sup>3+</sup> form perovskite type (Pr<sup>3+</sup>/Gd<sup>3+</sup>)Cr<sup>3+</sup>O<sub>3</sub> phases, consistent with classical “grey phases” of spent fuel. The radiation tolerance of these phases was examined via swift heavy ion irradiations of PrCrO<sub>3</sub> and GdCrO<sub>3</sub> compounds where electron microscopy and grazing incidence synchrotron diffraction indicate significant amorphization but retention of the crystal structure. The investigation highlights the pertinence of considering the chemistry of dopants used for nuclear fuel enhancements regarding their speciation during irradiation and subsequent occurrence within spent fuel.</p>

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Speciation and radiation stability of Cr and Ln “Grey-Phases” within Cr-doped (Ln,U)O2 spent fuel model materials

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月16日

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  • Daniil Shirokiy,
  • Andrey Bukaemskiy,
  • Maximilian Henkes,
  • Elena F. Bazarkina,
  • Christoph Hennig,
  • Andrew Ryan,
  • Martina Klinkenberg,
  • Murat Güngör,
  • Mara McCleary,
  • Julien Marquardt,
  • Andrew Fitch,
  • Kristina O. Kvashnina,
  • Dirk Bosbach,
  • Gabriel L. Murphy

摘要

Cr-doped UO₂ fuels are increasingly adopted for their superior in-reactor performance compared to undoped UO₂, but their spent fuel behaviour, particularly potential Cr speciation and fission product reactivity, remains poorly understood. This investigation has used high energy resolution fluorescence detected X-ray absorption near edge structure (HERFD-XANES) spectroscopy to examine speciation of Cr and Pr/Gd within 200 ppm Cr-doped (U4.4+0.7Pr3+0.3)O2-x and 200 ppm Cr-doped (U4.4+0.7Gd3+0.3)O2-x compounds. Despite both being UO2 soluble and undersaturated, analysis indicates that Cr3+ and Pr3+/Gd3+ form perovskite type (Pr3+/Gd3+)Cr3+O3 phases, consistent with classical “grey phases” of spent fuel. The radiation tolerance of these phases was examined via swift heavy ion irradiations of PrCrO3 and GdCrO3 compounds where electron microscopy and grazing incidence synchrotron diffraction indicate significant amorphization but retention of the crystal structure. The investigation highlights the pertinence of considering the chemistry of dopants used for nuclear fuel enhancements regarding their speciation during irradiation and subsequent occurrence within spent fuel.