<abstract xmlns="http://www.w3.org/1999/xhtml"> This work focuses on the reprocessability of metallic 92Mo and ceramic MgO, which is under investigation for (Pu,MA)-oxide (MA = minor actinide) fuel within a metallic 92Mo matrix (CERMET) and a ceramic MgO matrix (CERCER). Magnesium oxide and molybdenum reference samples have been fabricated by powder metallurgy. The dissolution of the matrices was studied as a function of HNO3 concentration (1-7 mol/L) and temperature (25-90°C). The rate of dissolution of magnesium oxide and metallic molybdenum increased with temperature. While the MgO rate was independent of the acid concentration (1-7 mol/L), the rate of dissolution of Mo increased with acid concentration. However, the dissolution of Mo at high temperatures and nitric acid concentrations was accompanied by precipitation of MoO3. The extraction of uranium, americium, and europium in the presence of macro amounts of Mo and Mg was studied by three different extraction agents: tri-n-butylphosphate (TBP), N,Nʹ-dimethyl-N,Nʹ-dioctylhexylethoxymalonamide (DMDOHEMA), and N,N,N’,N’- -tetraoctyldiglycolamide (TODGA). With TBP no extraction of Mo and Mg occurred. Both matrix materials are partly extracted by DMDOHEMA. Magnesium is not extracted by TODGA (D &lt; 0.1), but a weak extraction of Mo is observed at low Mo concentration. </abstract>

This work focuses on the reprocessability of metallic 92Mo and ceramic MgO, which is under investigation for (Pu,MA)-oxide (MA = minor actinide) fuel within a metallic 92Mo matrix (CERMET) and a ceramic MgO matrix (CERCER). Magnesium oxide and molybdenum reference samples have been fabricated by powder metallurgy. The dissolution of the matrices was studied as a function of HNO3 concentration (1-7 mol/L) and temperature (25-90°C). The rate of dissolution of magnesium oxide and metallic molybdenum increased with temperature. While the MgO rate was independent of the acid concentration (1-7 mol/L), the rate of dissolution of Mo increased with acid concentration. However, the dissolution of Mo at high temperatures and nitric acid concentrations was accompanied by precipitation of MoO3. The extraction of uranium, americium, and europium in the presence of macro amounts of Mo and Mg was studied by three different extraction agents: tri-n-butylphosphate (TBP), N,Nʹ-dimethyl-N,Nʹ-dioctylhexylethoxymalonamide (DMDOHEMA), and N,N,N’,N’- -tetraoctyldiglycolamide (TODGA). With TBP no extraction of Mo and Mg occurred. Both matrix materials are partly extracted by DMDOHEMA. Magnesium is not extracted by TODGA (D < 0.1), but a weak extraction of Mo is observed at low Mo concentration.

Reprocessability of molybdenum and magnesia based inert matrix fuels

Institut für Energie- und Klimaforschung, Nukleare Entsorgung und Reaktorsicherheit (IEK-6), Forschungszentrum Jülich GmbH (FZJ), 52425 Jülich, Germany, Tel.: +49 2461 61 4896, Fax: +49 2461 61 2450

Nukleonika

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

{"article-title":"Reprocessability of molybdenum and magnesia based inert matrix fuels"}

This work focuses on the reprocessability of metallic 92Mo and ceramic MgO, which is under investigation for (Pu,MA)-oxide (MA = minor actinide) fuel within a...

Reprocessability of molybdenum and magnesia based inert matrix fuels

Published Online: Dec 30, 2015

Page range: 871 - 878

Received: Jun 19, 2015

Accepted: Sep 15, 2015

DOI: https://doi.org/10.1515/nuka-2015-0124

Keywords
CERCER, CERMET, dissolution, inert matrix fuels (IMF), liquid-liquid extraction, minor actinides, reprocessing

© by Giuseppe Modolo

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

Reprocessability of molybdenum and magnesia based inert matrix fuels

Published Online: Dec 30, 2015

Page range: 871 - 878

Received: Jun 19, 2015

Accepted: Sep 15, 2015

DOI: https://doi.org/10.1515/nuka-2015-0124

KeywordsCERCER, CERMET, dissolution, inert matrix fuels (IMF), liquid-liquid extraction, minor actinides, reprocessing

© by Giuseppe Modolo

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

Keywords
CERCER, CERMET, dissolution, inert matrix fuels (IMF), liquid-liquid extraction, minor actinides, reprocessing