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Chlorine speciation in nuclear graphite: consequences on temperature release and on leaching

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.
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http://hal.in2p3.fr/in2p3-00663448
Contributor : Dominique Girod <>
Submitted on : Friday, January 27, 2012 - 10:30:26 AM
Last modification on : Tuesday, April 28, 2020 - 11:28:11 AM

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C.-E. Vaudey, N. Toulhoat, N. Moncoffre, N. Bérerd. Chlorine speciation in nuclear graphite: consequences on temperature release and on leaching. Migration 2009, Sep 2009, Kennewick, United States. pp.667-673, ⟨10.1524/ract.2010.1767⟩. ⟨in2p3-00663448⟩

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