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Yoshida, Takeru; Maeda, Koji; Sekio, Yoshihiro; Tomita, Hideki*; Iwata, Yoshihiro; Hirai, Mutsumi*; Mizokami, Masato*; Sakamoto, Tetsuo*
Scientific Reports (Internet), 8 Pages, 2026/00
Times Cited Count：0Sakamoto, Masahiro; Okumura, Keisuke; Kanno, Ikuo; Matsumura, Taichi; Terashima, Kenichi; Riyana, E. S.; Kaneko, Junichi*; Mizokami, Masato*; Mizokami, Shinya*
Journal of Nuclear Science and Technology, 62(8), p.756 - 765, 2025/08
Times Cited Count：0 Percentile：0.00(Nuclear Science & Technology)Sakamoto, Masahiro; Okumura, Keisuke; Kanno, Ikuo; Matsumura, Taichi; Terashima, Kenichi; Riyana, E. S.; Mizokami, Masato*; Mizokami, Shinya*
JAEA-Research 2024-017, 14 Pages, 2025/03
JAEA-Research-2024-017.pdf:1.34MB
In the TEPCO's Fukushima Daiichi Nuclear Power Station (1F), a trial retrieval of fuel debris with small-amount from Unit 2 is planned. The retrieved fuel debris will be transported out of 1F to Institutes in Ibaraki prefecture for analysis. The analyzed results will be utilized for the improvement of the processes (retrieval, transportation and storage) in the fuel debris management as feedback, and also for the development of technologies necessary in the future. The weight of fuel debris in the trial retrieval is planned to be a few grams. After the trial, the scale of retrieval will be expanded step by step. In the trial retrieval, a rational transportation container should be considered beforehand, according to the laws and regulations associated with the off-site transportation. The transportation container has a classification and the classification is decided according to the radioactivity of the material in the container. In this report, we evaluated the applicability of the Type A transport container to contribute to the safety assessment of retrieved fuel debris.
Yamashita, Takuya; Honda, Takeshi*; Mizokami, Masato*; Nozaki, Kenichiro*; Suzuki, Hiroyuki*; Pellegrini, M.*; Sakai, Takeshi*; Sato, Ikken; Mizokami, Shinya*
Nuclear Technology, 209(6), p.902 - 927, 2023/06
Times Cited Count：6 Percentile：71.79(Nuclear Science & Technology)Sasaki, Shinji; Maeda, Koji; Morishita, Kazuki; Onishi, Takashi; Sato, Ikken; Mizokami, Masato*; Mizokami, Shinya*
no journal, ,
no abstracts in English
Mizokami, Masato*; Ito, Kenichi*; Suzuki, Akihiro*; Sato, Ikken; Kurata, Masaki; Hirai, Mutsumi*; Mizokami, Shinya*
no journal, ,
no abstracts in English
Okumura, Keisuke; Sakamoto, Masahiro; Tada, Kenichi; Nishihara, Kenji; Mizokami, Shinya*; Mizokami, Masato*; Miki, Yosuke*; Kaneko, Seiji*
no journal, ,
no abstracts in English
Sakamoto, Masahiro; Okumura, Keisuke; Tada, Kenichi; Nishihara, Kenji; Mizokami, Shinya*; Mizokami, Masato*; Miki, Yosuke*; Kaneko, Seiji*
no journal, ,
no abstracts in English
Sakamoto, Masahiro; Okumura, Keisuke; Tada, Kenichi; Nishihara, Kenji; Mizokami, Shinya*; Mizokami, Masato*; Miki, Yosuke*; Kaneko, Seiji*
no journal, ,
no abstracts in English
Sakamoto, Masahiro; Okumura, Keisuke; Mizokami, Masato*; Mizokami, Shinya*
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no abstracts in English
Yoshida, Takeru; Sekio, Yoshihiro; Maeda, Koji; Morita, Masato*; Sakamoto, Tetsuo*; Mizokami, Masato*; Hirai, Mutsumi*
no journal, ,
In order to steadily carry out decommissioning of the Fukushima Daiichi Nuclear Power Plant (FDNPP), it is extremely important to understand the properties of fuel debris. In the past, analytical methods such as SEM-EDS, TEM and ICP-MS have been used to determine the properties of fuel debris. However, these analytical methods cannot obtain information on the local isotopic composition of the sample. FIB-TOF-SIMS, which the authors are developing, is expected to be a useful analytical method for determining the properties of fuel debris because it allows local isotopic composition analysis. In this study, we conducted analysis in a micro-area of FDNPP contaminated sample and succeeded in obtaining isotopic composition imaging of Li, B, and U from the measured particulates.
Tambo, Masaki; Fukaya, Hiroyuki; Kobayashi, Fuyumi; Otake, Yoshinori; Inada, Arisa; Mizokami, Masato*; Mizokami, Shinya*; Nakamura, Satoshi; Kitagaki, Toru; Takano, Masahide
no journal, ,
no abstracts in English
Kasama, Sohei; Ikeuchi, Hirotomo; Ogino, Hideki; Tsai, T.-H.; Nitta, Asahi; Sasaki, Shinji; Takano, Masahide; Kirishima, Akira*; Akiyama, Daisuke*; Mizokami, Masato*; et al.
no journal, ,
no abstracts in English
Kobata, Masaaki; Kobayashi, Toru; Tanida, Hajime; Okamoto, Yoshihiro; Fukuda, Tatsuo; Tsuji, Takuya; Matsuda, Shohei; Kawasaki, Ikuto; Shibata, Goro; Doi, Reisuke; et al.
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no abstracts in English
Ikeuchi, Hirotomo; Ogino, Hideki; Mizokami, Masato*; Mizokami, Shinya*
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no abstracts in English
Ikeuchi, Hirotomo; Ogino, Hideki; Maeda, Koji; Kitagaki, Toru; Kobata, Masaaki; Kobayashi, Toru; Mizokami, Masato*; Mizokami, Shinya*
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Endo, Yoichi*; Suzuki, Akihiro*; Kitsunai, Yuji*; Mizokami, Masato*; Mizokami, Shinya*; Ikeuchi, Hirotomo; Kasama, Sohei
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Shimode, Rie*; Kurematsu, Shigeru*; Kogawa, Noritaka*; Ikeuchi, Hirotomo; Kasama, Sohei; Mizokami, Masato*; Mizokami, Shinya*
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no abstracts in English
Nitta, Asahi; Yoshida, Takeru; Onishi, Takashi; Tsai, T.-H.; Sekio, Yoshihiro; Maeda, Koji; Ikeuchi, Hirotomo; Mizokami, Masato*; Mizokami, Shinya*
no journal, ,
no abstracts in English
Yoshida, Takeru; Nitta, Asahi; Onishi, Takashi; Sekio, Yoshihiro; Maeda, Koji; Ikeuchi, Hirotomo; Mizokami, Masato*; Mizokami, Shinya*
no journal, ,
The elemental distribution of several pieces of fuel debris was obtained by scanning electron microscopy combined with wavelength dispersive X-ray spectroscopy. We also evaluated the microscopic isotope ratios of nuclides in fuel debris and their crystal structures by secondary ion mass spectrometry and transmission electron microscopy.
