Oxygen potential of (Pu,U)O $_{2}$ I -Oxygen potential measurement of UO $_{2+X}$ and (Pu $_{0.3}$ U $_{0.7}$ )O $_{2-X}$

Kato, Masato ; Tamura, Tetsuya*; Endo, Hideo

The ratio of oxygen to metal is one of important fuel specifications on UO $_{2}$ and MOX fuels, because it effect on irradiation behavior. Oxygen potential of oxide fuels have been measured by various methods on the purpose of optimization of irradiation behavior and fabrication condition. In this repot the oxygen potential of UO $_{rm 2+x}$ and (Pu $_{0.3}$ U $_{0.7}$ )O $_{rm 2-x}$ was measured by thermal gravimetry and differential thermal analysis (TG-DTA). Measurements of oxygen potential were carried out at 800 $^{circ}$ C, 1000 $^{circ}$ C and 1200 $^{circ}$ C in Ar/H $_{2}$ /H $_{2}$ O mixture gas flow. Ratio of O/M was obtained from the weight change of the sample according to the partial oxygen pressure that was controlled by H $_{2}$ /H $_{2}$ O ratio in atmosphere. The partial oxygen pressure in atmosphere was measured by stabilized zyrconia oxygen sensor. The experimental results agree approximately to the other works. Thermodynamic data, Go $_{2}$ , Ho $_{2}$ , So $_{2}$ , were evaluatedfrom the experimental data. The oxygen potential of UO $_{rm 2+x}$ , (Pu,U)O $_{rm 2pm x}$ and PuO $_{rm 2-x}$ was modeled by lattice defect theory using the data of the literature and this work. The resulting equation well reproduce the large amount of oxygen potential-temperature-composition data for the Pu-U oxide system.

Language	:	Japanese
Report No.	:	JNC TN8400 2002-020
Pages	:	76 Pages
Publication Year/Month	:	2003/03
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PDF	:	JNC-TN8400-2002-020.pdf:2.1MB
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Keywords	:	no keyword
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Registration No. : GJ0820020108
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Oxygen potential of (Pu,U)O I -Oxygen potential measurement of UO and (PuU)O

Oxygen potential of (Pu,U)O $_{2}$ I -Oxygen potential measurement of UO $_{2+X}$ and (Pu $_{0.3}$ U $_{0.7}$ )O $_{2-X}$