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, Zr, and stainless steel and leaching behavior of the fission products and matrix elementsTonna, Ryutaro*; Sasaki, Takayuki*; Kodama, Yuji*; Kobayashi, Taishi*; Akiyama, Daisuke*; Kirishima, Akira*; Sato, Nobuaki*; Kumagai, Yuta; Kusaka, Ryoji; Watanabe, Masayuki
Nuclear Engineering and Technology, 55(4), p.1300 - 1309, 2023/04
Times Cited Count：2 Percentile：72.91(Nuclear Science & Technology)Simulated debris was synthesized using UO, Zr, and stainless steel and a heat treatment method under inert or oxidizing conditions. The primary U solid phase of the debris synthesized at 1473 K under inert conditions was UO, whereas a (U,Zr)O solid solution formed at 1873 K. Under oxidizing conditions, a mixture of U
O
and (Fe,Cr)UO
phases formed at 1473 K whereas a (U,Zr)O
solid solution formed at 1873 K. The leaching behavior of the fission products from the simulated debris was evaluated using two methods: the irradiation method, for which fission products were produced via neutron irradiation, and the doping method, for which trace amounts of non-radioactive elements were doped into the debris. The dissolution behavior of U depended on the properties of the debris and aqueous medium the debris was immersed in. Cs, Sr, and Ba leached out regardless of the primary solid phases. The leaching of high-valence Eu and Ru ions was suppressed, possibly owing to their solid-solution reaction with or incorporation into the uranium compounds of the simulated debris.
measurement and analysis techniques in X-ray photoelectron spectroscopy; From NAP-HARPES to 4D-XPSToyoda, Satoshi*; Yamamoto, Tomoki*; Yoshimura, Masashi*; Sumida, Hirosuke*; Mineoi, Susumu*; Machida, Masatake*; Yoshigoe, Akitaka; Suzuki, Satoru*; Yokoyama, Kazushi*; Ohashi, Yuji*; et al.
Vacuum and Surface Science, 64(2), p.86 - 91, 2021/02
We have developed measurement and analysis techniques in X-ray photoelectron spectroscopy. To begin with, time-division depth profiles of gate stacked film interfaces have been achieved by NAP-HARPES (Near Ambient Pressure Hard X-ray Angle-Resolved Photo Emission Spectroscopy) data. We then have promoted our methods to quickly perform peak fittings and depth profiling from time-division ARPES data, which enables us to realize 4D-XPS analysis. It is found that the traditional maximum entropy method (MEM) combined with Jackknife averaging of sparse modeling in NAP-HARPES data is effective to perform dynamic measurement of depth profiles with high precision.
Higashino, Ritsuko*; Sato, Yuji*; Masuno, Shinichiro*; Shobu, Takahisa; Funada, Yoshinori*; Abe, Nobuyuki*; Tsukamoto, Masahiro*
Laser 3D Manufacturing VII (Proceedings of SPIE Vol.11271), p.1127114_1 - 1127114_7, 2020/05
Times Cited Count：5 Percentile：95.2(Engineering, Manufacturing)Muramatsu, Toshiharu; Sato, Yuji; Kamei, Naomitsu; Aoyagi, Yuji*; Shobu, Takahisa
Nihon Kikai Gakkai Dai-13-Kai Seisan Kako, Kosaku Kikai Bumon Koenkai Koen Rombunshu (No.19-307) (Internet), p.157 - 160, 2019/10
no abstracts in English
Sato, Yuji*; Tsukamoto, Masahiro*; Shobu, Takahisa; Funada, Yoshinori*; Yamashita, Yorihiro*; Hara, Takahiro*; Sengoku, Masanori*; Sakon, Yu*; Okubo, Tomomasa*; Yoshida, Minoru*; et al.
Applied Surface Science, 480, p.861 - 867, 2019/06
Times Cited Count：32 Percentile：82.18(Chemistry, Physical)Sato, Yuji
Kokusai Kaigi Sokuho, 2019-No.07 (Internet), 3 Pages, 2019/06
no abstracts in English
Sato, Yuji*; Tsukamoto, Masahiro*; Shobu, Takahisa; Yamashita, Yoshihiro*; Yamagata, Shuto*; Nishi, Takaya*; Higashino, Ritsuko*; Okubo, Tomomasa*; Nakano, Hitoshi*; Abe, Nobuyuki*
Applied Physics A, 124(4), p.288_1 - 288_6, 2018/04
Times Cited Count：18 Percentile：63.78(Materials Science, Multidisciplinary)The dynamics of titanium (Ti) melted by laser irradiation was investigated in a synchrotron radiation experiment. As an indicator of wettability, the contact angle between a selective laser melting (SLM) baseplate and the molten Ti was measured by synchrotron X-rays at 30 keV during laser irradiation. As the baseplate temperature increased, the contact angle decreased, down to 28 degrees at a baseplate temperature of 500
C. Based on this result, the influence of wettability of a Ti plate fabricated by SLM in a vacuum was investigated. It was revealed that the improvement of wettability by preheating suppressed sputtering generation, and a surface having a small surface roughness was fabricated by SLM in a vacuum.
Sato, Koji; Kotake, Shoji; Fujita, Yuji; Mizuno, Tomoyasu
Energy Procedia, 7, p.140 - 145, 2011/09
Times Cited Count：3 Percentile：89.42(Nuclear Science & Technology)JAEA has been implementing the FaCT project in cooperation with electric utilities toward the commercialization of fast reactor cycle system before 2050. In this FaCT project, many innovative technologies with technical challenges are actively used in order to provide significant improvements in economic competitiveness, enhancement of safety and reliability, sustainability, and nonproliferation. The work of deciding on the adoption of innovative technologies by the end of JFY2010 is in progress. This paper describes current preliminary assessment results.
Miura, Kenta*; Sato, Takahiro; Ishii, Yasuyuki; Koka, Masashi; Yokoyama, Akihito; Kamiya, Tomihiro; Hiratani, Yuji*; Kiryu, Hiromu*; Ozawa, Yusuke*; Kada, Wataru*; et al.
no journal, ,
no abstracts in English
Sato, Yuji; Shirahama, Takuma*; Ishibashi, Junichi*; Muramatsu, Toshiharu
no journal, ,
no abstracts in English
Sato, Yuji; Tsukamoto, Masahiro*; Shobu, Takahisa; Muramatsu, Toshiharu
no journal, ,
no abstracts in English
Sato, Yuji; Tsukamoto, Masahiro*; Muramatsu, Toshiharu
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no abstracts in English
Saruta, Koichi; Kamei, Naomitsu; Sato, Yuji; Muramatsu, Toshiharu
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Sato, Yuji; Shirahama, Takuma*; Ishibashi, Junichi*; Muramatsu, Toshiharu
no journal, ,
no abstracts in English
Sato, Yuji; Kamei, Naomitsu; Shobu, Takahisa; Aoyagi, Yuji*; Muramatsu, Toshiharu
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no abstracts in English
-SS system; Irradiation or addition methodSasaki, Takayuki*; Kodama, Yuji*; Kobayashi, Taishi*; Akiyama, Daisuke*; Kirishima, Akira*; Sato, Nobuaki*; Watanabe, Masayuki; Kumagai, Yuta; Kusaka, Ryoji
no journal, ,
Fuel debris generated in the 1F severe accident remains in direct contact with water and leaching of nuclides from the debris is anticipated to continue. Therefore, in order to comprehend the leaching behavior, we have investigated the leaching of fission-product (FP) elements. We employed two methods for the synthesis of simulated fuel debris containing FP elements, that is (1) irradiation method: generating radioactive FPs in the simulated debris by irradiation of thermal neutron and (2) addition method: adding stable isotopes of FP elements into the starting materials of the simulated debris. In the early stage of leaching to water, Cs dissolved from these simulated debris ahead of U. But Cs/U ratio in water decreased with time, suggesting that water-soluble elements at the surface promptly dissolved. Divalent elements, Ba and Sr, dissolved similarly to Cs, whereas the leaching of Nd and Eu proceeded concomitantly with the U dissolution.
-SS systemSasaki, Takayuki*; Kodama, Yuji*; Tonna, Ryutaro*; Kobayashi, Taishi*; Kumagai, Yuta; Kusaka, Ryoji; Watanabe, Masayuki; Akiyama, Daisuke*; Kirishima, Akira*; Sato, Nobuaki*; et al.
no journal, ,
no abstracts in English
