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Journal Articles

Tritium decontamination of contaminated system with tritiated heavy water by drying treatment

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.

Journal Articles

Decommissioning activities in FUGEN

Kitamura, Koichi; Kutsuna, Hideki; Matsushima, Akira; Koda, Yuya; Iwai, Hiroki

Dekomisshoningu Giho, (51), p.2 - 10, 2015/04

Fugen Decommissioning Engineering Center (herein after called as "FUGEN") obtained the approval of the decommissioning program on February 2008. FUGEN has been carrying out decommissioning works based on its decommissioning program since then. Now is in initial stage, the dismantling works was launched in turbine system whose contamination was relatively low level and their various data have been accumulating. And the draining heavy water, tritium decontamination and transferring of heavy water were carried out safely and reasonably. The preparation for the clearance system and the research and development works for the reactor core dismantling have been progressed steadily as well. Meanwhile, FUGEN has affiliation with local industries and universities for collaboration research, and has exchanged the decommissioning information with domestic and overseas organizations continuously.

JAEA Reports

Document collection of the 24th Technical Special Committee on Fugen Decommissioning

Otani, Hiroshi; Matsushima, Akira; Mori, Naoto; Kutsuna, Hideki; Higashiura, Norikazu

JAEA-Review 2011-041, 55 Pages, 2012/01

JAEA-Review-2011-041.pdf:6.08MB

In planning and carrying out decommissioning technical development of Fugen, "Technical special committee on Fugen decommissioning", which consists of the members well-informed, is established, 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 "Current Situation of Fugen Decommissioning", "Radioactive Corrosion Products Decontamination Experiment with using Heavy Water System Equipment", "Laser Cutting Test on Dust Behavior in Cutting Work in Air", "Preparatory Situation for Operation of Clearance System" of this committee.

Journal Articles

Decommissioning program of FUGEN and current activities

Tezuka, Masashi; Mizui, Hiroyuki; Matsushima, Akira; Nakamura, Yasuyuki; Hayashi, Hirokazu; Sano, Kazuya; Nanko, Takashi; Morishita, Yoshitsugu

Proceedings of International Conference on Advanced Nuclear Fuel Cycle; Sustainable Options & Industrial Perspectives (Global 2009) (CD-ROM), p.2815 - 2821, 2009/09

FUGEN is a proto-type heavy water moderated, boiling light water cooled, pressure tube type reactor with 165MWe and has been shut downed on Mar. 2003. Following the approval of decommissioning program in 2008, stage of FUGEN was changed to the decommissioning of the facilities. The program consists of following four periods; (1) Spent fuel transportation, (2) Periphery facilities dismantlement, (3) Reactor dismantlement and (4) Building demolition. It is expected that the whole decommissioning will be completed until 2028. As a part of the work in the spent fuel transportation period, the main steam system and the feeder water system etc. are being dismantled in the turbine building. The remaining tritium in the heavy water system is also being removed for facilitating the dismantlement of the heavy water system. Moreover, method on dismantlement of the reactor core is being studied with considering the process under the water for the radiation shielding and the dust suppression.

JAEA Reports

None

Ijima, Takashi; Matsushima, Akira; MORITA, Satoshi; Hochin, Koji

JNC-TN4410 2004-004, 46 Pages, 2004/03

JNC-TN4410-2004-004.pdf:16.09MB

None

JAEA Reports

None

Kitabata, Takuya; Shimono, Kimihiro; sekiguchi, mineo; Matsushima, Akira

JNC-TN4410 2003-004, 42 Pages, 2003/03

JNC-TN4410-2003-004.pdf:11.33MB

None

Journal Articles

Development and Experience of Tritium Control in Heavy Water Reactor "FUGEN"

Kitamura, Koichi; Kitabata, Takuya; Matsushima, Akira

Purazuma, Kaku Yugo Gakkai-Shi, 78(12), p.1313 - 1318, 2002/12

None

Journal Articles

Radiation Protection against Tritium in the Fugen Nuclear Power Station

Matsushima, Akira; ; ; ; ; ;

Saikuru Kiko Giho, (11), p.81 - 91, 2001/06

None

Journal Articles

None

Matsushima, Akira;

Donen Giho, (86), 55 Pages, 

None

Oral presentation

Study on tritium removal technology of ATR Fugen

Matsushima, Akira

no journal, , 

no abstracts in English

Oral presentation

Technology development for decommissioning in FUGEN and current status

Kitamura, Koichi; Sano, Kazuya; Nakamura, Yasuyuki; Matsushima, Akira; Matsuo, Hidehiko; Ishiyama, Masahiro; Haneda, Takahiro; Tezuka, Masashi

no journal, , 

The decommissioning program of proto-type Advanced Thermal Reactor (ATR) FUGEN has started in 2008 as first decommissioning of the commercial-scale water reactor. It consists of four periods, considering the transportation of spent fuels and the radioactive decrease of highly activated materials. It is expected that the whole program of decommissioning will be completed until 2028.Now, the decommissioning is under the first period, spent fuels and heavy water has been carrying out from FUGEN, and a part of the turbine system with relatively low radioactive contamination has been dismantled. FUGEN has a complicated core structure consisting 224 fuel channels with pressure tubes and calandria tank, etc. and used heavy water as moderator, unlike other light water reactor. So, the dismantling technology of the reactor core and the decontamination technology of tritium in heavy water system, etc. have been studying in order to dismantle them safely. In this presentation, the contents of the decommissioning program and its current status, the studying situation of dismantling technology of reactor core using Abrasive Water Jet (AWJ) which is a candidate of cutting technologies, the examination of tritium decontamination in heavy water system, the study for C-14 penetrated into concrete structure will be presented mainly.

Oral presentation

Tritium removal test for decommissioning of FUGEN

Matsushima, Akira; Ishiyama, Masahiro; Matsuo, Hidehiko; Sato, Yuji

no journal, , 

no abstracts in English

Oral presentation

Friendly explanation on fast reactor and its safety to citizens and students; A Picture story at the 7th Tsuruga International Energy Forum (TIEF-7)

Kitabata, Takuya; Matsushima, Akira; Kimura, Itsuro*

no journal, , 

A picture story on "Fast Reactor and its safety" was produced to explain the FBR severe accident effectively. The story was play by the women's member of the Fukui-ken ENE no Kai at the 7th Tsuruga International Forum (TIEF-7) at the Wakasa Wan Energy Research Center on November 20, 2010 held by JAEA.

Oral presentation

Tritium removal for decommissioning of FUGEN

Matsushima, Akira

no journal, , 

no abstracts in English

Oral presentation

Tritium technology and decommissioning of Fugen

Matsushima, Akira

no journal, , 

Announce the status of the decommissioning of the Fugen and tritium control technology

Oral presentation

Study of removal technique and confirmation technique of removal condition in heavy water withdraw and tritium removal for decommissioning of FUGEN

Kadowaki, Haruhiko; Matsuo, Hidehiko; Yamane, Naoki; Matsushima, Akira

no journal, , 

no abstracts in English

Oral presentation

Investigation and an examination of the plastic sheeting adhesion method

Matsushima, Akira

no journal, , 

no abstracts in English

Oral presentation

A Tritium removal for the decommissioning of FUGEN, 1; Applicability of the tritium removal technique for the actual equipment and pipe

Ando, Koji; Kadowaki, Haruhiko; Matsuo, Hidehiko; Yamane, Naoki; Matsushima, Akira

no journal, , 

no abstracts in English

Oral presentation

Tritium removal of FUGEN using a compact portable dehumidifier system of hollow fiber membrane separation, 2; Verification test of applicability

Kadowaki, Haruhiko; Matsuo, Hidehiko; Yamane, Naoki; Asakura, Yamato*; Matsushima, Akira

no journal, , 

no abstracts in English

Oral presentation

Examination of a large caliber stainless steel piping isolation construction method

Matsushima, Akira

no journal, , 

no abstracts in English

29 (Records 1-20 displayed on this page)