Effects of colloidal and dissolved silica on the dissolution of UO2 nuclear fuel in groundwater leaching tests

M. Amme; L. Aldave de las Heras; M. Betti; H. Lang; M. Stöckl

doi:10.1023/b:jrnc.0000034867.55260.a7

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Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 261: Issue 2

Effects of colloidal and dissolved silica on the dissolution of UO₂ nuclear fuel in groundwater leaching tests

Authors:

M. Amme

M. Amme Institute for Transuranium Elements European Commission, Joint Research Centre D-76125 Karlsruhe Germany

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L. Aldave de las Heras

L. Aldave de las Heras Institute for Transuranium Elements European Commission, Joint Research Centre D-76125 Karlsruhe Germany

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M. Betti

M. Betti Institute for Transuranium Elements European Commission, Joint Research Centre D-76125 Karlsruhe Germany

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H. Lang

H. Lang GSF National Research Centre for Environment and Health Department of Hydrology D-85764 Neuherberg Germany

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M. Stöckl

M. Stöckl GSF National Research Centre for Environment and Health Department of Hydrology D-85764 Neuherberg Germany

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Pages:: 327–336

Online Publication Date:: 03 Nov 2004

Publication Date:: 17 Aug 2004

Article Category:: Research Article

DOI:: https://doi.org/10.1023/b:jrnc.0000034867.55260.a7

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Abstract

The influence of aqueous silica of two different physical forms (dissolved ions and SiO₂ colloid) on the dissolution of UO₂ nuclear fuel material was investigated at 95 °C temperature in autoclaves. It was tested that SiO₂ colloids can contribute to the surface degradation or act as carrier for uranium ions during a near field geochemical dissolution process. In the presence of colloids, well-crystallized secondary phases containing U and Si were formed on the surfaces, the latter attacked by the treatment. This was not the case when dissolved Si was used. SiO₂ colloids were partly found in their original form on the surfaces after 1000 hours at 95 °C. A surface charge model suggests that this different effects are due to the development of electrostatic interactions between the UO₂ and SiO₂ surfaces.

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Journal of Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language	English
Size	A4
Year of Foundation	1968
Volumes per Year	1
Issues per Year	12
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5731 (Print)
ISSN	1588-2780 (Online)