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Takiya, Hiroaki; Kadowaki, Haruhiko; Matsushima, Akira; Matsuo, Hidehiko; Ishiyama, Masahiro; Aratani, Kenta; Tezuka, Masashi
JAEA-Technology 2020-001, 76 Pages, 2020/05
JAEA-Technology-2020-001.pdf:6.06MB
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.
Soejima, Goro; Iwai, Hiroki; Kadowaki, Haruhiko; Nakamura, Yasuyuki; Tsuzuki, Satoshi*; Yasunaga, Kazushi*; Nakata, Yoshinori*; Kume, Kyo*
Heisei-28-Nendo Koeki Zaidan Hojin Wakasawan Enerugi Kenkyu Senta kenkyu Nempo, 19, P. 9, 2017/10
no abstracts in English
Soejima, Goro; Iwai, Hiroki; Nakamura, Yasuyuki; Hayashi, Hirokazu; Kadowaki, Haruhiko; Mizui, Hiroyuki; Sano, Kazuya
Proceedings of 25th International Conference on Nuclear Engineering (ICONE-25) (CD-ROM), 5 Pages, 2017/07
no abstracts in English
Kadowaki, Haruhiko; Matsushima, Akira; Nakajima, Yoshiaki
Proceedings of 24th International Conference on Nuclear Engineering (ICONE-24) (DVD-ROM), 6 Pages, 2016/06
Advanced thermal reactor "FUGEN" is a heavy water-moderated boiling light water-cooled pressure tube-type reactor. Because tritium had been generated in the heavy water during the reactor operation, the heavy water system and helium system were contaminated by tritium. The chemical form of the tritium was water molecule in FUGEN. Air-through drying and vacuum drying were applied to the system drying, and it was demonstrated that both methods were effective for drying treatment of heavy water in system. Helium system, low-contamination and non inclusion, could finish the vacuum drying rapidly. However, Heavy water purification system needed long period for drying treatment. The result showed that it needed long period to dry up if the objects include the adsorbent of water such as alumina pellet, resin and silica gel. But it can be accelerated by replacement absorbed heavy water to light water from the result of drying treatment of the rotary type dehumidifier.
Kutsuna, Hideki; Yamazaki, Koichi; Kadowaki, Haruhiko; Iguchi, Yukihiro
JAEA-Review 2015-008, 39 Pages, 2015/06
JAEA-Review-2015-008.pdf:8.77MB
Fugen Decommissioning Engineering Center has been establishing "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 inside and outside the country, as the central point in the energy research and development base making project of Fukui prefecture, and to utilize the outcome in our decommissioning to the technical development effectively. This report compiles presentation materials "The Current Situation of Fugen Decommissioning", "Applicability Test for Dismantling with the Diamond Wire Saw using equipments used in Fugen", "Status of the Tritium Removal and Evaluation of the Efficiency of the Room-Temperature Vacuum drying" and "Integration Policy of Knowledge Management System for Fugen", presented in the 31st Technical special committee on Fugen decommissioning which was held on March 13, 2015.
Kutsuna, Hideki; Iwai, Hiroki; Kadowaki, Haruhiko
JAEA-Review 2014-023, 30 Pages, 2014/08
JAEA-Review-2014-023.pdf:100.36MB
Fugen Decommissioning Engineering Center, in planning and carrying out our decommissioning technical development, has been establishing "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 inside and outside the country, as the central point in the energy research and development base making project of Fukui prefecture, and to utilize the outcome in our decommissioning to the technical development effectively. This report compiles presentation materials "The Current Situation of Fugen Decommissioning", "Development for the Sampling Technology from the Reactor Core Structure of FUGEN" and "Efficiency Improvement for the Room-Temperature Vacuum Drying in the Tritium Removal", presented in the 29th Technical special committee on Fugen decommissioning which was held on March 13, 2014.
Kutsuna, Hideki; Iwai, Hiroki; Mizui, Hiroyuki; Kadowaki, Haruhiko; Nakamura, Yasuyuki
JAEA-Review 2013-049, 49 Pages, 2014/02
JAEA-Review-2013-049.pdf:5.59MB
Fugen Decommissioning Engineering Center has been establishing "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 inside and outside the country. This report compiles presentation materials "The Current Situation of Fugen Decommissioning", "The Current Status of the Cutting Test toward the Practical Use of Laser Cutting Technology and the Future Plan", "Study on Radioactive Substance Osmosis for Basis Concrete of Equipment", "Verification Tests of the Room-Temperature Vacuum Drying and the Evaluation Method of Residual Amount of Heavy Water in the Tritium Removal" and "Applicability Test of Thermal and Mechanical Cutting Technology for the Dismantlement of the Internal Core of Fukushima Daiichi NPS", presented in the 28th Technical special committee on Fugen decommissioning which was held on September 24, 2013.
Kutsuna, Hideki; Kadowaki, Haruhiko; Sakakibara, Yasuhide; Hirata, Tomohiro
JAEA-Review 2013-027, 40 Pages, 2013/09
JAEA-Review-2013-027.pdf:7.42MB
Fugen Decommissioning Engineering Center is establishing "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, as the central point in the energy research and development base making project of Fukui prefecture. This report compiles presentation materials "The Current Situation of Fugen Decommissioning", "Upgrading of a Removal Technique for a Heavy Water Withdraw and a Tritium Removal" and "Research of Ageing Management of Nuclear Power Plant for Safe Long Term Operating in Fukui", "The Work for Solution and Promotion on Technical Challenge (Public Offering Type)" which is related with the efforts of Fugen in the Fukui energy research and development centralization plan, presented in the 27th Technical special committee on Fugen decommissioning which was held on March 14, 2013.
Kutsuna, Hideki; Koda, Yuya; Shibahara, Yuji; Kadowaki, Haruhiko
JAEA-Review 2012-040, 36 Pages, 2013/01
JAEA-Review-2012-040.pdf:8.2MB
Fugen Decommissioning Engineering Center is establishing "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 inside and outside the country, as the central point in the energy research and development base making project of Fukui prefecture, and to utilize the outcome in our decommissioning to the technical development effectively. This report compiles presentation materials "The Current Situation of Fugen Decommissioning", "The Application Results of Various Cutting Methods in the Dismantling of the Equipments of the Turbine System", "Study of Work Program on the Dismantling Activities with the Project Management Data Evaluation System", "Record and Knowledge in Working for a Heavy Water Withdraw and a Tritium Removal", presented in the 26th Technical special committee on Fugen decommissioning which was held on September 13, 2012.
Kadowaki, Haruhiko; Meguro, Yoshihiro
Journal of Nuclear Science and Technology, 49(9), p.881 - 887, 2012/09
Times Cited Count：4 Percentile：31.96(Nuclear Science & Technology)Tomioka, Osamu; Kadowaki, Haruhiko; Meguro, Yoshihiro; Takahashi, Kuniaki; Kato, Atsushi*
no journal, ,
no abstracts in English
Kadowaki, Haruhiko; Kato, Atsushi; Tomioka, Osamu; Meguro, Yoshihiro; Takahashi, Kuniaki
no journal, ,
Palladium-copper catalysts were developed to decompose nitrate ion in a sodium nitrate solution of high concentration using a liquid reductant. The developed Pd-Cu/C catalyst showed a catalytic activity for decomposition of nitrate. It was found that the catalyst, in which Pd/Cu ratio was 1/0.83, showed the best activity for the decomposition of nitrate ion and nitrite ion as an intermediate and that the catalytic activity increased with an increase of support ratio in the catalyst.
Meguro, Yoshihiro; Kadowaki, Haruhiko; Kato, Atsushi; Tomioka, Osamu; Takahashi, Kuniaki
no journal, ,
no abstracts in English
Kadowaki, Haruhiko; Kato, Atsushi; Tomioka, Osamu; Sakakibara, Tetsuro; Yamaguchi, Hiromi; Meguro, Yoshihiro; Takahashi, Kuniaki
no journal, ,
no abstracts in English
Kadowaki, Haruhiko; Kato, Atsushi; Tomioka, Osamu; Meguro, Yoshihiro; Takahashi, Kuniaki
no journal, ,
We studied effects of Pd-Cu composition and support material on catalytic activity in the nitrate decomposition with Pd-Cu catalyst and hydrazine as a liquid reductant. It was found that Pd was alloyed with Cu in the Pd-Cu catalyst prepared by electroless deposition method and the Pd-Cu surface composition was strongly influenced by the support material. The Pd-Cu composition giving the maximal catalytic activity for decomposition of nitrate ion and nitrite ion as intermediate was determined in the denitration with the Pd-Cu loaded carbon catalysts. And also it was found that the catalytic activity varied according to the support material.
Kadowaki, Haruhiko; Kato, Atsushi; Tomioka, Osamu; Meguro, Yoshihiro; Takahashi, Kuniaki
no journal, ,
no abstracts in English
Kadowaki, Haruhiko; Kato, Atsushi; Tomioka, Osamu; Meguro, Yoshihiro; Takahashi, Kuniaki
no journal, ,
no abstracts in English
Kadowaki, Haruhiko; Kato, Atsushi; Mamiya, Keiji; Takano, Masato; Yamashita, Toshiyuki; Meguro, Yoshihiro; Takahashi, Kuniaki
no journal, ,
no abstracts in English
Kadowaki, Haruhiko; Kato, Atsushi; Tomioka, Osamu; Meguro, Yoshihiro; Takahashi, Kuniaki
no journal, ,
no abstracts in English
Kadowaki, Haruhiko; Kato, Atsushi; Mamiya, Keiji; Takano, Masato; Yamashita, Toshiyuki; Meguro, Yoshihiro; Takahashi, Kuniaki
no journal, ,
no abstracts in English
