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Analysis of the Secondary Phases Formed by Corrosion of U(3)Si(2)-Al Research Reactor Fuel Elements in the Presence of Chloride Rich Brines

Corrosion experiments with non-irradiated U(3)Si(2)-Al research reactor fuel samples were carried out in synthetic MgCl(2)-rich brine to identify and quantify the secondary phases because depending on their composition and on their amount, such compounds can act as a sink for the radionuclide releas...

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Autores principales: Neumann, Andreas, Klinkenberg, Martina, Curtius, Hildegard
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6073351/
https://www.ncbi.nlm.nih.gov/pubmed/29966357
http://dx.doi.org/10.3390/ma11071121
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author Neumann, Andreas
Klinkenberg, Martina
Curtius, Hildegard
author_facet Neumann, Andreas
Klinkenberg, Martina
Curtius, Hildegard
author_sort Neumann, Andreas
collection PubMed
description Corrosion experiments with non-irradiated U(3)Si(2)-Al research reactor fuel samples were carried out in synthetic MgCl(2)-rich brine to identify and quantify the secondary phases because depending on their composition and on their amount, such compounds can act as a sink for the radionuclide release in final repositories. Within the experimental period of 100 days at 90 °C and anoxic conditions the U(3)Si(2)-Al fuel sample was completely disintegrated. The obtained solids were subdivided into different grain size fractions and non-ambient X-ray diffraction (XRD) was applied for their qualitative and quantitative phase analysis. The secondary phases consist of lesukite (aluminum chloro hydrate) and layered double hydroxides (LDH) with varying chemical compositions. Furthermore, iron, residues of non-corroded nuclear fuel (U(3)Si(2)), iron oxy hydroxides and chlorides were also observed. In addition to high amorphous contents (>45 wt %) hosting the uranium, the quantitative phase analysis showed, that LDH compounds and lesukite were the major crystalline phases. Scanning electron microscopy (SEM) and energy dispersive -Xray spectroscopy (EDS) confirmed the results of the XRD analysis. Elemental analysis revealed that U and Al were concentrated in the solids. However, most of the iron, added as Fe(II) aqueous species, remained in solution.
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spelling pubmed-60733512018-08-13 Analysis of the Secondary Phases Formed by Corrosion of U(3)Si(2)-Al Research Reactor Fuel Elements in the Presence of Chloride Rich Brines Neumann, Andreas Klinkenberg, Martina Curtius, Hildegard Materials (Basel) Article Corrosion experiments with non-irradiated U(3)Si(2)-Al research reactor fuel samples were carried out in synthetic MgCl(2)-rich brine to identify and quantify the secondary phases because depending on their composition and on their amount, such compounds can act as a sink for the radionuclide release in final repositories. Within the experimental period of 100 days at 90 °C and anoxic conditions the U(3)Si(2)-Al fuel sample was completely disintegrated. The obtained solids were subdivided into different grain size fractions and non-ambient X-ray diffraction (XRD) was applied for their qualitative and quantitative phase analysis. The secondary phases consist of lesukite (aluminum chloro hydrate) and layered double hydroxides (LDH) with varying chemical compositions. Furthermore, iron, residues of non-corroded nuclear fuel (U(3)Si(2)), iron oxy hydroxides and chlorides were also observed. In addition to high amorphous contents (>45 wt %) hosting the uranium, the quantitative phase analysis showed, that LDH compounds and lesukite were the major crystalline phases. Scanning electron microscopy (SEM) and energy dispersive -Xray spectroscopy (EDS) confirmed the results of the XRD analysis. Elemental analysis revealed that U and Al were concentrated in the solids. However, most of the iron, added as Fe(II) aqueous species, remained in solution. MDPI 2018-06-30 /pmc/articles/PMC6073351/ /pubmed/29966357 http://dx.doi.org/10.3390/ma11071121 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Neumann, Andreas
Klinkenberg, Martina
Curtius, Hildegard
Analysis of the Secondary Phases Formed by Corrosion of U(3)Si(2)-Al Research Reactor Fuel Elements in the Presence of Chloride Rich Brines
title Analysis of the Secondary Phases Formed by Corrosion of U(3)Si(2)-Al Research Reactor Fuel Elements in the Presence of Chloride Rich Brines
title_full Analysis of the Secondary Phases Formed by Corrosion of U(3)Si(2)-Al Research Reactor Fuel Elements in the Presence of Chloride Rich Brines
title_fullStr Analysis of the Secondary Phases Formed by Corrosion of U(3)Si(2)-Al Research Reactor Fuel Elements in the Presence of Chloride Rich Brines
title_full_unstemmed Analysis of the Secondary Phases Formed by Corrosion of U(3)Si(2)-Al Research Reactor Fuel Elements in the Presence of Chloride Rich Brines
title_short Analysis of the Secondary Phases Formed by Corrosion of U(3)Si(2)-Al Research Reactor Fuel Elements in the Presence of Chloride Rich Brines
title_sort analysis of the secondary phases formed by corrosion of u(3)si(2)-al research reactor fuel elements in the presence of chloride rich brines
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6073351/
https://www.ncbi.nlm.nih.gov/pubmed/29966357
http://dx.doi.org/10.3390/ma11071121
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