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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：5 Percentile：89.01(Nuclear Science & Technology)Morishita, Kazuki; Onishi, Takashi; Maeda, Koji; Mizokami, Masato*; Ito, Kenichi*; Mizokami, Shinya*
no journal, ,
no abstracts in English
Sasaki, Shinji; Maeda, Koji; Morishita, Kazuki; Onishi, Takashi; Sato, Ikken; Mizokami, Masato*; 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
Maeda, Koji; Mizokami, Masato*; Suzuki, Akihiro*; Ito, Kenichi*; Sato, Ikken; Mizokami, Shinya*
no journal, ,
Investigation of in-reactor cesium chemical behavior in TEPCO's Fukushima Daiichi Nuclear Power Station accident was performed. Especially, analysis of samples from containment in Fukushima Daiichi NPS was evaluated.
Morishita, Kazuki; Onishi, Takashi; Maeda, Koji; Mizokami, Masato*; Ito, Kenichi*; Mizokami, Shinya*
no journal, ,
no abstracts in English
Mizokami, Masato*; Suzuki, Akihiro*; Maeda, Koji; Ito, Kenichi*; Sato, Ikken; Mizokami, Shinya*
no journal, ,
Some radioactive material samples were taken inside the PCV of Fukushima Daiichi Units 1-3. TEPCO is working for sample collection, transport, and detailed examinations at hot cells using SEM, TEM and ICP-MS. Uranium-bearing micro-particles were analysed using SEM and Emit was confirmed that particles derived from fuel can be categorized into two groups. One is believed to have been separated from hot corium by hydrodynamic processes, while the other showed characteristics suggesting evaporation from hot corium and condensation afterward. The former particles might have compositional features common to the major part of fuel debris. Both groups possibly cause alpha contamination (actinide behavior) in the reactor building.
Morishita, Kazuki; Onishi, Takashi; Maeda, Koji; Mizokami, Masato*; Ito, Kenichi*; Mizokami, Shinya*
no journal, ,
Samples, collected from the operating floor of the reactor building of Fukushima Daiichi Unit 2, were immersed in deionized water and nitric acid. Immersed solutions were analyzed by gamma-ray spectrometry and ICP-MS. Analyses suggest small amount of Fe, Mn and Cu derived from structural materials of nuclear reactor, and Te, Cs and U derived from spent fuels.
Mizokami, Masato*; Ito, Kenichi*; Suzuki, Akihiro*; Sato, Ikken; Kurata, Masaki; Hirai, Mutsumi*; Mizokami, Shinya*
no journal, ,
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.
Kurata, Masaki; Madokoro, Hiroshi; Okumura, Keisuke; Sato, Ikken; Mizokami, Masato*; Ito, Kenichi*; Mizokami, Shinya*
no journal, ,
Based on the analysis of the samples collected in the PCV interior of Fukushima Daiichi NPP, potential issues regarding the fuel debris retrieval are summarized. The analytical targets, analytical method and obtainable knowledge that are necessary to evaluate each issue are discussed. Valuable information can be obtained even from small samples to understand the current situation of the plant and the accident progression. Although the amount of collectable samples is limited, we considered how to evaluate the whole fuel debris and how to utilize the analytical results for recriticality, burnup and safety issues.
Sakamoto, Masahiro; Okumura, Keisuke; Mizokami, Masato*; Mizokami, Shinya*
no journal, ,
no abstracts in English
Sakamoto, Masahiro; Okumura, Keisuke; Kaneko, Junichi*; Mizokami, Masato*; Mizokami, Shinya*
no journal, ,
no abstracts in English
