Development of Glass Matrix for Radioactive Waste Conditioning

Abstract:

Understanding of the incorporation of actinides in borosilicate matrix used for nuclear waste storage is of a great importance for radioactive waste immobilization. This study carried out on matrix glasses doped respectively with 30wt% UO₃ and CeO₂, Nd₂O₃ used for chemical modelling of the actinides. Neutron and X-ray diffraction measurements and Reverse Monte Carlo (RMC) simulations were performed. For several glasses, it was found that the basic network structure consists of tetrahedral SiO₄ units and of mixed trigonal BO₃ and tetrahedral BO₄. The BO₃ and BO₄ units are linked to SiO₄, forming mixed ^[4]Si-O-^[3]B and ^[4]Si-O-^[4]B bond-linkages. From significant second neighbour atomic pair correlations have been revealed that U, Ce, Nd accommodates in both silicate and borate site.

• Periodical: Materials Science Forum (Volume 885)
• Pages: 48-54
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.885.48
• Online since: February 2017
• Authors: Margit Fábián*, Csaba Araczki
• Keywords: Diffraction Methods, Glasses, High-Level Radioactive Waste, Reverse Monte Carlo Modeling

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