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Chlorine speciation in nuclear graphite: consequences on temperature release and on leaching
-
C.-E. Vaudey
Published/Copyright:
November 23, 2010
Abstract
This paper aims to get information on pristine chlorine speciation and its evolution with temperature in nuclear graphite used as a moderator in the first generation UNGG French reactors. For this purpose, temperature-programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS) have been carried out on samples annealed in the temperature range 200–1000 °C. Two chemical forms of different thermal stabilities have been identified. Around 70% of chlorine is assigned to stable organic chlorine bound to aromatic carbon whereas around 30% is assigned to inorganic thermally labile oxychlorinated groups. The consequences for direct disposal are discussed.
Keywords: 36Cl; Nuclear graphite; Speciation; Temperature-programmed desorption; X-ray photoelectron spectroscopy
Published Online: 2010-11-23
Published in Print: 2010-11
© by Oldenbourg Wissenschaftsverlag, Villeurbanne cedex, Germany
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Keywords for this article
36Cl;
Nuclear graphite;
Speciation;
Temperature-programmed desorption;
X-ray photoelectron spectroscopy
Articles in the same Issue
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