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Taruta, Yasuyoshi; Aratani, Kenta; Miyashita, Shinichi; Tomoda, Koichi; Fujiwara, Wataru
JAEA-Review 2024-002, 31 Pages, 2024/06
"Fugen Decommissioning Engineering Center", in planning and carrying out our decommissioning technical development, organizes "Technical special committee on Fugen decommissioning" which consists of the members well-informed, aiming to make good use of Fugen as a place for technological development which is opened domestic and international, as the central place in research and development base of Fukui prefecture, and to utilize the outcome in our decommissioning to the technical development effectively. This report consists of presentation paper are "The current status of Fugen decommissioning", "Comparative consideration of dismantling method for fuel exchanger", "Status of consideration for installation of backup power supply equipment" and "Streamlining decommissioning operations by utilizing digital technology" which is presented in the 40th Technical Special Committee on Fugen Decommissioning.
Takiya, Hiroaki; Kadowaki, Haruhiko; Matsushima, Akira; Matsuo, Hidehiko; Ishiyama, Masahiro; Aratani, Kenta; Tezuka, Masashi
JAEA-Technology 2020-001, 76 Pages, 2020/05
Advanced Thermal Reactor (ATR) FUGEN was operated for about 25 years, and now has been proceeding decommissioning after the approval of the decommissioning plan in Feb. 2008. The reactor, heavy water system and helium system are contaminated by tritium because of neutron absorption of heavy water, which is a moderator. Before dismantling these facilities, it is necessary to remove tritium from them for not only reducing the amount of tritium released to surrounding environment and the risk of internal exposure by tritium but also ensuring the workability. In first phase of decommissioning (Heavy Water and Other system Decontamination Period), tritium decontamination of the reactor, heavy water system and helium system started in 2008 and completed in 2018. This report shows the results of tritium decontamination of the reactor, heavy water system and helium system.
Iwai, Hiroki; Soejima, Goro; Takiya, Hiroaki; Awatani, Yuto; Aratani, Kenta; Miyamoto, Yuta; Tezuka, Masashi
Dekomisshoningu Giho, (61), p.12 - 19, 2020/03
FUGEN Decommissioning Engineering Center received the approval of the decommissioning plan in 2008, and we have been progressing the decommissioning. The first phase of decommissioning (Heavy Water and Other System Decontamination Period) finished in March 2018, and FUGEN has entered into the second phase of decommissioning (Reactor Periphery Facilities Dismantling Period). This report outlines the technology demonstration of sampling from reactor core structure of FUGEN that to prepare for reactor dismantlement in the third phase.
Aratani, Kenta; Takiya, Hiroaki; Koda, Yuya; Ishiyama, Masahiro; Tezuka, Masashi; Mizui, Hiroyuki
Proceedings of 27th International Conference on Nuclear Engineering (ICONE-27) (Internet), 5 Pages, 2019/05
The prototype advanced thermal reactor FUGEN is the heavy water-moderated, boiling light water-cooled, pressure tube-type reactor, and has progressing the decommissioning since 2008. The most of facilities such as turbine system have the system structure and the operating conditions similar to those of BWR, although FUGEN has the characteristic structure of reactor core and the heavy water treatment facilities. In Japan, the knowledge and findings from FUGEN decommissioning activities are very important and valuable to perform BWR decommissioning in future, because the decommissioning of FUGEN is research and development as the first decommissioning of real-scale reactor. In the first phase of FUGEN decommissioning activities, the dismantlement project of reactor core cooling system started. By 2017, the low-level contaminated equipment such as the condensers of turbine system and the main-steam pipes of main-steam system was dismantled, and the management data was accumulated. The knowledge and findings from the 10 years of dismantlement experience will be reflected to the future dismantlement of higher contaminated facilities.
Takiya, Hiroaki; Aratani, Kenta; Awatani, Yuto; Ishiyama, Masahiro; Tezuka, Masashi; Mizui, Hiroyuki
Dekomisshoningu Giho, (59), p.2 - 12, 2019/03
FUGEN Decommissioning Engineering Center received the approval of the decommissioning program in 2008, and we have been progressing the decommissioning. The first phase of decommissioning (Heavy Water and Other system Decontamination Period) finished in May 2018, and FUGEN has entered into the second phase of decommissioning (Reactor Periphery Facilities Dismantling Period). This report outlines the results obtained in the first phase of decommissioning of FUGEN.
Aratani, Hidekazu*; Nakatani, Yasuhiro*; Fujiwara, Hidenori*; Kawada, Moeki*; Kanai-Nakata, Yuina*; Yamagami, Kohei*; Fujioka, Shuhei*; Hamamoto, Satoru*; Kuga, Kentaro*; Kiss, Takayuki*; et al.
Physical Review B, 98(12), p.121113_1 - 121113_6, 2018/09
Times Cited Count:5 Percentile:23.09(Materials Science, Multidisciplinary)Koda, Yuya; Tezuka, Masashi; Aratani, Kenta; Nanko, Takashi
Proceedings of 23rd International Conference on Nuclear Engineering (ICONE-23) (DVD-ROM), 8 Pages, 2015/05
Decommissioning Engineering Center, which is called FUGEN, has started dismantling works based on its decommissioning program since 2008. The dismantling works was launched in turbine system whose contamination was relatively low level. Feed-water-heaters and main-steam-pipes had been dismantled already, and now, main-condensers have been dismantling. Approximately 1000 tons of dismantled waste was produced from the dismantling works so far. Dismantling work needs to be done safely and effectively with appropriate cutting devices depending on the situations that is its method, quality and shape of the materials to be dismantled. Therefore, in FUGEN, varieties of conventional cutting devices, which are thermal cutting method and mechanical cutting method, are used in the dismantling works to evaluate their applicability depending on the work situations. Obtained cutting data are summarized and evaluated in order to reflect to the following own works and other decommissioning plants.
Aratani, Kenta; Matsushima, Akira; Takiya, Hiroaki; Awatani, Yuto; Sasaki, Katsuya*; Maehata, Hidehiko*; Maruyama, Akira*
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Maruyama, Akira*; Sasaki, Katsuya*; Daiku, Hiroyuki*; Ishiyama, Masahiro; Yoshida, Yuto*; Aratani, Kenta
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Aratani, Kenta; Ishiyama, Masahiro; Tezuka, Masashi
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Aratani, Kenta
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Awatani, Yuto; Aratani, Kenta; Kadowaki, Haruhiko; Nakamura, Yasuyuki; Ishiyama, Masahiro; Tezuka, Masashi
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Nakamura, Yasuyuki; Iwai, Hiroki; Sano, Kazuya; Yamamoto, Kosuke; Aratani, Kenta
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Aratani, Kenta; Ishiyama, Masahiro; Awatani, Yuto; Miyamoto, Yuta; Tezuka, Masashi
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Aratani, Kenta; Miyamoto, Yuta; Kadowaki, Haruhiko; Tezuka, Masashi
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no abstracts in English