Thermal conductivities of minor actinide oxides for advanced fuel

Nishi, Tsuyoshi; Ito, Akinori; Takano, Masahide ; Akabori, Mitsuo; Arai, Yasuo; Minato, Kazuo

The thermal diffusivities of americium oxide and neptunium dioxide were determined by a laser flash method. It was found that the thermal diffusivities of AmO $_{2-x}$ and NpO $_{2}$ decreased with increasing temperature. It was also found that the decrease in O/Am ratio during the thermal diffusivity measurements under vacuum resulted in a slight decrease in thermal diffusivity of AmO $_{2-x}$ . The thermal conductivities of AmO $_{2-x}$ and NpO $_{2}$ were evaluated from the measured thermal diffusivities, heat capacities and bulk densities. The thermal conductivity of AmO $_{2-x}$ was smaller than those of the literature values of UO $_{2}$ and PuO $_{2}$ . On the other hand, the thermal conductivity of NpO $_{2}$ from 873 to 1473 K lay between those of UO $_{2}$ and PuO $_{2}$ . The thermal conductivities of AmO $_{2-x}$ and NpO $_{2}$ decreased with increasing temperature in the temperature range investigated.

Language	:	English
Journal	:	Proceedings of 3rd International ATALANTE Conference (ATALANTE 2008) (CD-ROM)
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Number	:
Pages	:	6 Pages
Publication Year/Month	:	2008/05
Meeting title	:	3rd International ATALANTE Conference (ATALANTE 2008)
Held date	:	2008/05
Location (city)	:	Montpellier
Location (country)	:	France
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Keywords	:	no keyword
Research Facility	:	WASTEF(廃棄物安全試験施設)
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Registration No. : BB20073734
JAEA Abstracts No. : 36001026
Paper Submission No. : 4347

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