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Oral presentation

Ionic radii in fluorite structured actinide dioxides

Vauchy, R.; Hirooka, Shun; Murakami, Tatsutoshi

no journal, , 

The ionic radii of the constitutive species of fluorite-structured actinide dioxides were re-evaluated with our crystallographic hybrid model.

Oral presentation

Measurement of high temperature heat capacity and thermal diffusivity of (U,Pu)O$$_{2}$$ as a function of Pu content

Hirooka, Shun; Matsumoto, Taku; Morimoto, Kyoichi; Ogasawara, Masahiro*; Murakami, Tatsutoshi; Kato, Masato

no journal, , 

no abstracts in English

Oral presentation

Manufacturing and property measurements of homogeneous simulated FP (Nd/Sm/Gd/Zr)-doped MOX

Horii, Yuta; Hirooka, Shun; Vauchy, R.; Hayashizaki, Kohei; Uno, Hiroki*; Tamura, Tetsuya*; Sunaoshi, Takeo*; Ohwada, Hideaki*; Yamada, Tadahisa*; Murakami, Tatsutoshi

no journal, , 

Fission products (FPs), which are generated and stored in fuel matrix by irradiating nuclear fuels, affect thermo-physical fuel properties. To improve accuracy of computer simulation of irradiation behaviors, studies on the fuel properties containing FPs are needed. However, only a limited number of studies on the irradiated fuel properties, especially MOX fuels, have been reported in the world due to difficulties in handling of the irradiated fuels. Moreover, the effect of individual FP cannot be evaluated because many kinds of FPs are stored in the irradiated fuels. Thus, an alternative method should be suggested to easily study the effects of FPs on the fuel properties. In this study, fuel properties were measured to evaluate the effects of FPs by using simulated FP-doped MOX specimens instead of a real irradiated fuel. For the measurement, the homogeneity of FP in a specimen is also important, as well as uranium and plutonium. To obtain homogeneous specimens, re-grinding and re-sintering processes were repeated and the improvement was confirmed by EPMA and XRD at each set of the process. A specimen with suitable homogeneity for measurement was prepared by repeating the series of processes three times. Sm$$_{2}$$O$$_{3}$$, Gd$$_{2}$$O$$_{3}$$ and ZrO$$_{2}$$, which are major and soluble FPs in irradiated MOX fuels, were selected as simulated FPs. The effect of individual FP on the properties, such as thermal conductivity and thermal expansion, was evaluated on the specimens. In addition, Nd$$_{2}$$O$$_{3}$$, Sm$$_{2}$$O$$_{3}$$ and Gd$$_{2}$$O$$_{3}$$ co-doped MOX was also prepared to compare the influence of containing multiple lanthanides.

Oral presentation

Study on eutectic melting and relocation behavior of B$$_{4}$$C powder and stainless steel through radiative heating

Ahmed, Z.*; Pellegrini, M.*; Yamano, Hidemasa; Sharma, A. K.*; Okamoto, Koji*

no journal, , 

Experimental investigations with radiative heating were conducted using stainless steel (SS) tubes filled with boron carbide (B$$_{4}$$C) powder in the temperature range of 1150$$^{circ}$$C to 1372$$^{circ}$$C, specifically targeting long duration melting and its relocation behavior. Eutectic melting occurred when the interface temperature reached approximately 1180$$^{circ}$$C. Two melting mechanisms were identified: the SS layer peeling off the B$$_{4}$$C powder and forming a melting drop that contained boride structures. A comprehensive composition analysis utilizing scanning electron microscopy energy dispersive X ray spectroscopy (SEM EDX) provided insights of the surface morphology of the molten drop after rapid cooling at a rate of 50$$^{circ}$$C/s. Additionally, X ray diffraction (XRD) analysis confirmed the presence of different boride crystal phases.

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