Dopant effect on the spent fuel matrix dissolution of new advanced fuels: Cr-doped UO2 and Cr/Al-doped UO2

Rodríguez-Villagra, N.; Riba, Olga; Milena-Pérez, A.; Cobos, J.; Jimenez-Bonales, L.; Fernández-Carretero, S.; Coene, Emilie; Silva, O.; Duro, Lara

doi:10.1016/j.jnucmat.2022.153880

Cited by 2 publications

(1 citation statement)

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“…Apparently, Nd 3+ is stabilising the UO 2 structure. From these results it can be concluded that also doping of UO 2 with Gd 3+ , which is used as burnable neutron poison in advanced nuclear fuels due to its very high neutron cross section, would probably lead to a comparable stabilisation of the UO 2 like Nd 3+ , because of the very similar ionic radii and the chemical behaviour of both lanthanides [17,18].…”

Section: Discussionmentioning

confidence: 91%

Accelerated dissolution of doped UO2-based model systems as analogues for modern spent nuclear fuel under repository conditions

et al. 2023

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Systematic single-effect dissolution studies were carried out on the dissolution behaviour of pure and Cr- or Nd-doped UO2 reference pellets as model materials for spent nuclear fuel with varying doping levels, densities, and grain sizes as well as of industrially produced Cr- and Cr/Nd-doped UO2 pellets. The results were obtained from accelerated static batch dissolution experiments performed under strictly controlled conditions using H2O2 as simulant for radiolytic oxidants formed due to the alpha-irradiation of water. The results indicate that the addition of Cr and the consequential modification of the fuel matrix does not lead to a significant change of the dissolution behaviour of these model materials compared to pure UO2 reference materials. Contrarily, the dissolution rates of Nd-doped pellets are significantly lower than those of pure and Cr-doped pellets. These results provide additional insights into the influence of doping on the dissolution behaviour of modern spent light water reactor fuels under the post-closure conditions expected in a deep geological repository. Graphical abstract

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Section: Discussionmentioning

confidence: 91%