Thermodynamic Study of Actinides and Lanthanides During Total Vaporisation of a Very High Burn-up UO2 Fuel
A commercial PWR fuel sample of local burn-up of about 200 GWd/t was annealed in a Knudsen Cell Mass
Spectrometer system (KCMS) with a temperature rate of 10 K/min up to 2750 K at which temperature the
sample was completely vaporised. At high temperature the vapour above the sample contains mainly
actinide and lanthanide oxides, the vapour pressure of refractory metals remaining below the detection
limit. The local isotopic composition was determined by mass spectrometry and indicated a high content
in higher actinides. From comparison of the partial vapour pressure with data for the pure oxides,
obtained from experiments or literature, it is demonstrated that the actinide and lanthanide oxides dissolved
in UO2 matrix obey Henry¿s law.
HIERNAUT Jean-Pol;
GOTCU Petronela;
COLLE Jean-Yves;
KONINGS Rudy;
2009-02-09
ELSEVIER SCIENCE BV
JRC50346
0022-3115,
www.elsevier.com/locate/jnucmat,
https://publications.jrc.ec.europa.eu/repository/handle/JRC50346,
10.1016/j.jnucmat.2008.06.012,
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