<abstract xmlns="http://www.w3.org/1999/xhtml"><p> The development of effective processes to recover minor actinides from spent nuclear fuel cannot leave out of consideration the evaluation of the impact of ionizing radiations on safety, fluid dynamics and extraction efficiency. It is common knowledge from the literature that radiation damage mainly affects the diluents and, indirectly, the extractants [1], but a lack of knowledge remains regarding the radiolytic behavior of innovative selective actinide extraction (i-SANEX) diluents [2, 3]. As natural prosecution of the work already performed on diluted nitric acid solutions [4], 0.44 M nitric acid solutions were irradiated in contact with a mixture of kerosene + 5 vol.% 1-octanol by a Co-60 source at 2.5 kGy/h dose rate and up to 100 kGy absorbed dose, conditions of interest for the future industrial facility. Density, viscosity, acidity, nitrate anion concentration and phase transfers were systematically measured before and after γ-irradiation. This was performed because radiation-induced modifications of these parameters may induce alterations of both the fluid dynamics and the separation performances of the extracting system. The results suggest that the fluid-dynamics of the system should be unaltered. In fact, only slight alterations of the organic phase viscosity and of the aqueous phase acidity were measured after irradiation, suggesting the occurrence of limited phase transfers and of diluent by-products formation. </p></abstract>

The development of effective processes to recover minor actinides from spent nuclear fuel cannot leave out of consideration the evaluation of the impact of ionizing radiations on safety, fluid dynamics and extraction efficiency. It is common knowledge from the literature that radiation damage mainly affects the diluents and, indirectly, the extractants [1], but a lack of knowledge remains regarding the radiolytic behavior of innovative selective actinide extraction (i-SANEX) diluents [2, 3]. As natural prosecution of the work already performed on diluted nitric acid solutions [4], 0.44 M nitric acid solutions were irradiated in contact with a mixture of kerosene + 5 vol.% 1-octanol by a Co-60 source at 2.5 kGy/h dose rate and up to 100 kGy absorbed dose, conditions of interest for the future industrial facility. Density, viscosity, acidity, nitrate anion concentration and phase transfers were systematically measured before and after γ-irradiation. This was performed because radiation-induced modifications of these parameters may induce alterations of both the fluid dynamics and the separation performances of the extracting system. The results suggest that the fluid-dynamics of the system should be unaltered. In fact, only slight alterations of the organic phase viscosity and of the aqueous phase acidity were measured after irradiation, suggesting the occurrence of limited phase transfers and of diluent by-products formation.

Physico chemical properties of irradiated i-SANEX diluents

Department of Energy, Politecnico di Milano, Piazza L. da Vinci 32, Milano, I-20133, Italy, Tel.: +39 02 2399 6395,

Department of Energy, Politecnico di Milano, Piazza L. da Vinci 32, Milano, I-20133, Italy, Tel.: +39 02 2399 6395

Department of Chemistry, Materials and Chemical Engineering “Giulio Natta”, Politecnico di Milano, Piazza L. da Vinci 32, I-20133 Milano, Italy

Nukleonika

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

{"article-title":"Physico chemical properties of irradiated i-SANEX diluents"}

The development of effective processes to recover minor actinides from spent nuclear fuel cannot leave out of consideration the evaluation of the impact of...

Physico chemical properties of irradiated i-SANEX diluents

Online veröffentlicht: 30. Dez. 2015

Seitenbereich: 893 - 898

Eingereicht: 19. Juni 2015

Akzeptiert: 21. Aug. 2015

DOI: https://doi.org/10.1515/nuka-2015-0118

Schlüsselwörter
density, i-SANEX, partitioning, radiolysis, Raman, UV-Vis, viscosity

© by Eros Mossini

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Physico chemical properties of irradiated i-SANEX diluents

Online veröffentlicht: 30. Dez. 2015

Seitenbereich: 893 - 898

Eingereicht: 19. Juni 2015

Akzeptiert: 21. Aug. 2015

DOI: https://doi.org/10.1515/nuka-2015-0118

Schlüsselwörterdensity, i-SANEX, partitioning, radiolysis, Raman, UV-Vis, viscosity

© by Eros Mossini

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Schlüsselwörter
density, i-SANEX, partitioning, radiolysis, Raman, UV-Vis, viscosity