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Journal Articles

Extraction mechanism of lanthanide ions into silica-based microparticles studied by single microparticle manipulation and microspectroscopy

Otaka, Toshiki*; Sato, Tatsumi*; Ono, Shimpei; Nagoshi, Kohei; Abe, Ryoji*; Arai, Tsuyoshi*; Watanabe, So; Sano, Yuichi; Takeuchi, Masayuki; Nakatani, Kiyoharu*

Analytical Sciences, 35(10), p.1129 - 1133, 2019/10

 Times Cited Count:0 Percentile:0(Chemistry, Analytical)

JAEA Reports

Research on diffusion behavior in oxide fuels (Joint research)

Sato, Isamu; Arima, Tatsumi*; Nishina, Masahiro*; Tanaka, Kosuke; Onose, Shoji; Idemitsu, Kazuya*

JAEA-Research 2012-006, 66 Pages, 2012/05

JAEA-Research-2012-006.pdf:13.55MB

As one of the important properties for fuel manufacturability and burning behavior, the diffusion behavior of actinides in oxide fuels was investigated by both the experimental and the molecular dynamics simulation (MD). Using diffusion couples consisted of an Am containing mixed oxide fuel and a UO$$_{2}$$ fuel, the diffusion tests were performed. The diffusion coefficients were estimated to be 10$$^{-12}$$m$$^{2}$$/s $$sim$$ 10$$^{-14}$$m$$^{2}$$/s. In addition, the difference between Pu and Am diffusion coefficients was vanishingly small. The temperature dependence of bulk diffusion coefficients of actinides in mixed oxide fuels could be evaluated by MD. An evaluation technique for the grain boundary diffusion could be established based on the coincidence site lattice theory. The practical diffusion coefficients were obtained by combining data from the experiments with those predicted from MD. The practical diffusion coefficients obtained was discussed for use of a fuel behavior analysis code.

Journal Articles

Diffusion behaviors of plutonium and americium in polycrystalline urania

Sato, Isamu; Tanaka, Kosuke; Arima, Tatsumi*

IOP Conference Series; Materials Science and Engineering, 9, p.012005_1 - 012005_8, 2010/05

 Times Cited Count:1 Percentile:56.95

UO$$_{2}$$ discs and Am containing MOX discs were prepared to be diffusion couples. They were annealed for 4.5 h at 1600$$^{circ}$$C in a furnace under the constant oxygen partial pressures, and then concentrations of Pu and Am across the interfaces of them were measured with EPMA. The average diffusion coefficients of Pu and Am were obtained from the concentration profiles and were between 10$$^{-15}$$ and 10$$^{-13}$$m/s$$^{2}$$, in which the difference between Pu and Am was undetermined. This indicates that the difference between redistributions of Pu and Am found in a PIE may not be caused by the diffusion but by the other transport phenomenon. Moreover, the diffusion behavior was affected by existence of grain boundaries and the oxygen partial pressure in the furnace during annealing. From the affection of the grain boundary to the diffusion, the "practical" diffusion estimation may need grain boundary modeling.

JAEA Reports

None

Sato, Isamu*; Arima, Tatsumi*; Idemitsu, Kazuya*; ; Namekawa, Takashi

JNC TY9400 99-003, 153 Pages, 1999/02

JNC-TY9400-99-003.pdf:6.95MB

no abstracts in English

JAEA Reports

None

Sato, Isamu*; *; ; Arima, Tatsumi*;

PNC TY9606 98-003, 99 Pages, 1998/06

PNC-TY9606-98-003.pdf:22.27MB

no abstracts in English

JAEA Reports

None

Sato, Isamu*; *; ; Arima, Tatsumi*; ; Kajitani, Yukio

PNC TY9606 97-001, 117 Pages, 1997/07

PNC-TY9606-97-001.pdf:19.16MB

no abstracts in English

Oral presentation

Diffusion behavior of Pu and Am in oxide fuels

Sato, Isamu; Tanaka, Kosuke; Tanaka, Kenya; Arima, Tatsumi*; Idemitsu, Kazuya*

no journal, , 

Both an Am containing MOX fuel and a UO$$_{2}$$ fuel were contacted and heated, and then the diffusion behavior was observed by EPMA. The diffusion coefficients of Pu and Am as an important property for fuel design were evaluated from these result.

Oral presentation

Diffusion behavior of Pu and Am in oxide fuels, 2; Diffusion behavior of Pu and Am in oxide fuels, 2

Sato, Isamu; Tanaka, Kosuke; Tanaka, Kenya; Arima, Tatsumi*; Idemitsu, Kazuya*

no journal, , 

Diffusion couples with polycrystalline UO$$_{2}$$ and Am-MOX discs were annealed for 4.5 h at 1600$$^{circ}$$C under constant oxygen partial pressures. Concentrations of Pu and Am across the interfaces of the couples were measured using EPMA. The average diffusion coefficients of Pu and Am were estimated to be 10$$^{-15}$$ and 10$$^{-14}$$m$$^{2}$$/s by fitting their concentration profiles to Fick's law, and the difference between them was not so significant.

Oral presentation

Current status and perspective of the polarized neutron reflectometer, SHARAKU

Takeda, Masayasu; Yamazaki, Dai; Hayashida, Hirotoshi; Kubota, Masato; Maruyama, Ryuji; Soyama, Kazuhiko; Asaoka, Hidehito; Yamazaki, Tatsuya; Yoshida, Noboru*; Sakaguchi, Yoshifumi*; et al.

no journal, , 

no abstracts in English

Oral presentation

Current status and future prospects for a new polarized neutron reflectometer SHARAKU at MLF in J-PARC, 1

Takeda, Masayasu; Yamazaki, Dai; Hayashida, Hirotoshi; Kubota, Masato; Maruyama, Ryuji; Soyama, Kazuhiko; Asaoka, Hidehito; Yamazaki, Tatsuya*; Yoshida, Noboru*; Sakaguchi, Yoshifumi*; et al.

no journal, , 

no abstracts in English

Oral presentation

Current status of a newly developed polarized neutron reflectometer (Sharaku) at bemaline BL 17 of J-PARC

Kubota, Masato; Takeda, Masayasu; Yamazaki, Dai; Soyama, Kazuhiko; Maruyama, Ryuji; Hayashida, Hirotoshi; Asaoka, Hidehito; Oikawa, Kenichi; Yamazaki, Tatsuya*; Aizawa, Kazuya; et al.

no journal, , 

Oral presentation

A New polarized neutron reflectometer SHARAKU at Material Life Science Facility (MLF) at Japan Proton Accelerator Research Complex (J-PARC)

Takeda, Masayasu; Yamazaki, Dai; Soyama, Kazuhiko; Hayashida, Hirotoshi; To, Kentaro; Yamagishi, Hideshi*; Katagiri, Masaki*; Sakasai, Kaoru; Maruyama, Ryuji; Mizusawa, Tazuko*; et al.

no journal, , 

Oral presentation

A New polarized neutron reflectometer at the intense pulsed neutron source of the Materials and Life Science Experimental Facility (MLF) of J-PARC

Takeda, Masayasu; Yamazaki, Dai; Soyama, Kazuhiko; Hayashida, Hirotoshi; To, Kentaro; Yamagishi, Hideshi*; Katagiri, Masaki*; Sakasai, Kaoru; Maruyama, Ryuji; Mizusawa, Tazuko*; et al.

no journal, , 

Oral presentation

Diffusion coefficients of fission products in UO$$_{2}$$ with molecular dynamics method

Sato, Isamu; Matsumoto, Taku; Koyama, Shinichi; Arima, Tatsumi*

no journal, , 

Diffusion coefficients of fission product elements, Zr, Nd, Ba and Sr in UO$$_{2}$$ crystal which are substituent cations for U were evaluated with molecular dynamics. The diffusion coefficients of Nd and Ba/Sr which are trivalent and divalent cations are greater than those of U and Zr that are tetravalent cations.

Oral presentation

Analysis of Eu transfer between single polymer-immobilized porous silica microparticles containing phosphorous extractant and solution by microspectroscopy

Otaka, Toshiki*; Sato, Tatsumi*; Nakatani, Kiyoharu*; Nagoshi, Kohei*; Abe, Ryoji*; Arai, Tsuyoshi*; Watanabe, So; Sano, Yuichi; Takeuchi, Masayuki

no journal, , 

no abstracts in English

15 (Records 1-15 displayed on this page)
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