Oxygen potential of (U $_{0.88}$ Pu $_{0.12}$ )O $_{2pm x}$ and (U $_{0.7}$ Pu $_{0.3}$ )O $_{2pm x}$ at high temperatures of 1673-1873 K

Kato, Masato ; Takeuchi, Kentaro ; Uchida, Teppei; Sunaoshi, Takeo*; Konashi, Kenji*

Many studies on oxygen potentials have been reported, but their data were scattered and the data at high temperatures are limited. In this work, the oxygen potential of (U $_{0.88}$ Pu $_{0.12}$ )O $_{2pm x}$ and (U $_{0.7}$ Pu $_{0.3}$ )O $_{2pm x}$ was measured at high temperatures of 1673-1873 K using gas equilibrium method using thermo-gravimetry. The influence of Pu addition on the oxygen potential of MOX was discussed. The oxygen potential and the O/M ratio were decided by in-situ analysis. The oxygen partial pressure was adjusted by controlling the ratio of $_{H_{2}}$ / $_{H_{2}}$ O in the flowing gas atmosphere, and the oxygen potential was determined. The oxygen potentials measured by the point defect model. The deviation x varied with the relation of in the near stoichiometric composition region. The oxygen potential increased with increasing Pu content. The values of stoichiometric MOX containing 12% and 30%Pu were determined to be -334 kJ/mol and -296 kJ/mol, respectively, at 1773 K.

Language	:	English
Journal	:	Journal of Nuclear Materials
Volume	:	414
Number	:	2
Pages	:	p.120 - 125
Publication Year/Month	:	2011/07
Meeting title	:	Nuclear Materials Conference 2010 (NuMat 2010)
Held date	:	2010/10
Location (city)	:	Karlsruhe
Location (country)	:	Germany
Patent information	:
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Paper URL	:	https://doi.org/10.1016/j.jnucmat.2011.01.042
DOI for research data	:
Keywords	:	no keyword
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Registration No. : BB20100284
JAEA Abstracts No. : 39001120
Paper Submission No. : 9379

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Oxygen potential of (UPu)O and (UPu)O at high temperatures of 1673-1873 K

Oxygen potential of (U $_{0.88}$ Pu $_{0.12}$ )O $_{2pm x}$ and (U $_{0.7}$ Pu $_{0.3}$ )O $_{2pm x}$ at high temperatures of 1673-1873 K