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Report No.
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Thermal expansion measurement of (U,Pu)O$$_{2-x}$$ in oxygen partial pressure controlled atmosphere

Kato, Masato  ; Ikusawa, Yoshihisa  ; Sunaoshi, Takeo*; McClellan, K.*; Nelson, A.*

Thermal expansion of MOX was measured as a function of O/M ratio. The measurements of the thermal expansion and O/M were carried out with dilatometer and thermo gravimeter, respectively, in cooling process of 4 K/min. Oxygen potential of MOX has been measured, and the correlation was derived to represent the relationship between oxygen potential and O/M ratio. The P$$_{O2}$$ in the atmosphere was controlled according to the previous data which were controlled by adjusting PH$$_{2}$$/PH$$_{2}$$O ratio. It was confirmed to hold constant O/M ratio during the measurements by thermo-gravimetry. Thermal expansion of (U$$_{0.7}$$Pu$$_{0.3}$$)O$$_{2-x}$$ increased with increasing the deviation x. The correlation to represent the thermal expansion was derived with Pu content and O/M ratio. The thermal expansion coefficients are consistent with those of PuO$$_{2-x}$$.

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