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Journal Articles

France-Japan collaboration on severe accident studies in sodium-cooled fast reactors, 2; Methodologies and calculations of severe accident phases

Sogabe, Joji; Ishida, Shinya; Tagami, Hirotaka; Okano, Yasushi; Kamiyama, Kenji; Onoda, Yuichi; Matsuba, Kenichi; Yamano, Hidemasa; Kubo, Shigenobu; Kubota, Ryuzaburo*; et al.

Proceedings of International Conference on Nuclear Fuel Cycle (GLOBAL2024) (Internet), 4 Pages, 2024/10

In the frame of France-Japan collaboration, the calculational methodologies were defined and assessed, and the phenomenology and the severe accident consequences were investigated in a pool-type sodium-cooled fast reactor.

Journal Articles

Phase equilibria and thermal expansion of CaTiO$$_{3}$$ doped with neptunium

Sato, Tsuyoshi*; Yamashita, Toshiyuki; Matsui, Tsuneo*

Journal of Nuclear Materials, 344(1-3), p.67 - 72, 2005/09

https://doi.org/10.1016/j.jnucmat.2005.04.018
 Times Cited Count：4 Percentile：28.83(Materials Science, Multidisciplinary)

Phase relationships between NpO$$_{2}$$ and CaTiO$$_{3}$$ or Ca(Ti, Al)O$$_{3}$$ were investigated by X-ray diffraction (XRD) analysis, using specimens prepared at 1773 K in Ar-8%H$$_{2}$$. Single phase solid solutions were formed 0-7.5 mol%Np and 1-10 mol%Np for CaTiO$$_{3}$$ and Ca(Ti, Al)O$$_{3}$$, respectively. By substituting Al for Ti in CaTiO$$_{3}$$, Np solubility in Ca(Ti, Al)O$$_{3}$$ increased. Solubility of Np was compared with those of U and Pu, and was discussed with oxidation states and ionic radii of dopants. Thermal expansions of (Ca,Np)TiO$$_{3}$$ were measured from room temperature to 1273 K in Ar-8%H$$_{2}$$ using high-temperature XRD technique. These specimens showed nearly the same value of volumetric thermal expansion coefficients, suggesting that the incorporation of tetravalent Np into CaTiO$$_{3}$$ had practically no effect on stabilization of the crystal lattice. This finding was in a marked contrast to that of Pu doped CaTiO$$_{3}$$, where pronounced stabilization in the crystal was observed by incorporating Pu into CaTiO$$_{3}$$.

Journal Articles

Calorimetric study of phase transitions in (NH$$_{4}$$)$$_{3}$$H(SO$$_{4}$$)$$_{2}$$

; ; ;

Journal of the Physical Society of Japan, 47(3), p.874 - 877, 1979/00

https://doi.org/10.1143/JPSJ.47.874
 Times Cited Count：40

no abstracts in English

Journal Articles

Dielectric and dilatometric studies of phase transitions in (ND$$_{4}$$)$$_{3}$$D(SeO$$_{4}$$)$$_{2}$$ and isotope effect

; ;

Journal of the Physical Society of Japan, 46(2), p.577 - 580, 1979/00

https://doi.org/10.1143/JPSJ.46.577
 Times Cited Count：52

no abstracts in English

Journal Articles

Thermal expansion and dielectric studies of the phase transition in ferroelectric NaNO$$_{2}$$ at -95$$^{circ}$$C

Journal of the Physical Society of Japan, 26(4), p.953 - 956, 1969/00

https://doi.org/10.1143/JPSJ.26.953

no abstracts in English

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