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JAEA Reports

Background radiation monitoring using manned helicopter for application of technique of nuclear emergency response in the fiscal year 2018 (Contract research)

Futemma, Akira; Sanada, Yukihisa; Komiya, Tomokazu; Iwai, Takeyuki*; Seguchi, Eisaku*; Matsunaga, Yuki*; Kawabata, Tomoki*; Haginoya, Masashi*; Hiraga, Shogo*; Sato, Kazuhiko*; et al.

JAEA-Technology 2019-017, 95 Pages, 2019/11

JAEA-Technology-2019-017.pdf:12.09MB

By the nuclear disaster of Fukushima Daiichi Nuclear Power Station (FDNPS), Tokyo Electric Power Company (TEPCO), caused by the Great East Japan Earthquake and the following tsunami on March 11, 2011, a large amount of radioactive material was released from the FDNPS. After the nuclear disaster, airborne radiation monitoring using manned helicopter was conducted around FDNPS. We have carried out the background radiation monitoring around the nuclear power stations of the whole country to apply the airborne radiation monitoring technique that has been cultivated in the aerial monitoring around FDNPS against nuclear emergency response. The results of monitoring around Shimane and Hamaoka Nuclear Power Stations in the fiscal 2018 were summarized in this report. In addition, technical issues were described.

JAEA Reports

Radiation monitoring using manned helicopter around the nuclear power station in the fiscal year 2018 (Contract research)

Futemma, Akira; Sanada, Yukihisa; Ishizaki, Azusa; Komiya, Tomokazu; Iwai, Takeyuki*; Seguchi, Eisaku*; Matsunaga, Yuki*; Kawabata, Tomoki*; Haginoya, Masashi*; Hiraga, Shogo*; et al.

JAEA-Technology 2019-016, 116 Pages, 2019/11

JAEA-Technology-2019-016.pdf:14.09MB

By the nuclear disaster of Fukushima Daiichi Nuclear Power Station (FDNPS), Tokyo Electric Power Company (TEPCO), caused by the Great East Japan Earthquake and the following tsunami on March 11, 2011, a large amount of radioactive material was released from the FDNPS. After the nuclear disaster, airborne radiation monitoring using manned helicopter has been conducted around FDNPS. The results in the fiscal 2018 were summarized in this report. Discrimination method of gamma rays from Rn-progenies was also utilized to evaluate their effect on aerial radiation monitoring. In addition, analysis taken topographical effects into consideration was applied to previous results of airborne monitoring to improve the precision of conventional method.

JAEA Reports

Replacement technology for front acrylic panels of a large-sized glove box using bag-in / bag-out method

Sakuraba, Naotoshi; Numata, Masami; Komiya, Tomokazu; Ichise, Kenichi; Nishi, Masahiro; Tomita, Takeshi; Usami, Koji; Endo, Shinya; Miyata, Seiichi; Kurosawa, Tatsuya; et al.

JAEA-Technology 2009-071, 34 Pages, 2010/03

JAEA-Technology-2009-071.pdf:21.07MB

As a part of maintenance technology of a large-sized glove box for handling of TRU nuclides, we developed replacement technology for front acrylic panels using the bag-in/bag-out method and applied this technology to replace the deteriorated front acrylic panels at Waste Safety Testing Facility (WASTEF) in Nuclear Science Research Institute of Japan Atomic Energy Agency (JAEA). As a consequence, we could safely replace the front acrylic panels under the condition of continuous negative pressure only with partial decontamination of the glove box. We also demonstrated that the present technology is highly effective in points of safety, workability and cost as compared to the usual replacement technology for front acrylic panels of a glove box, where workers in an air-line suit replace directly the front acrylic panels in a green house.

Journal Articles

Replacement technique for front acrylic panels of a large size glove box using bag-in / bag-out method

Endo, Shinya; Numata, Masami; Ichise, Kenichi; Nishi, Masahiro; Komiya, Tomokazu; Sakuraba, Naotoshi; Usami, Koji; Tomita, Takeshi

Proceedings of 46th Annual Meeting of "Hot Laboratories and Remote Handling" Working Group (HOTLAB 2009) (CD-ROM), 6 Pages, 2009/09

For safety operation and maintenance of the large size glove box, the degraded acrylic panels of the box must be replaced by the new panels. As the conventional replacement technique, the decontamination of the glove box and installation of isolation tent are necessary to prevent the leak of contamination, because airtight condition of the box is broken down during replacement process. Therefore, the prerequisite works are required considerable manpower. The new replacement technique using bag-in / bag-out method was developed by JAEA. In this technique, for keeping the airtight condition of the box, the inside of degraded panel is covered with an airtight panel and the outside is covered over the large bag which is used to replace the acrylic panels. As the benefits of this technique, the prerequisite works are not required and the manpower is less than a third of the conventional technique.

JAEA Reports

Decommissioning of facility for use of radioisotopes on waste management and disposal facility

Takebe, Shinichi; Komiya, Tomokazu

JAERI-Tech 99-068, p.46 - 0, 1999/09

JAERI-Tech-99-068.pdf:2.25MB

no abstracts in English

JAEA Reports

Radionuclide transfer onto ground surface in surface water flow, 2; Undisturbed tuff rock

Mukai, Masayuki; Takebe, Shinichi; Komiya, Tomokazu

JAERI-Research 94-014, 25 Pages, 1994/09

JAERI-Research-94-014.pdf:1.23MB

no abstracts in English

JAEA Reports

Field test of radionuclide migration; Cooperative research between JAERI and CIRP

*; Yamamoto, Tadatoshi; ; Takebe, Shinichi; Ogawa, Hiromichi; Tanaka, Tadao; Mukai, Masayuki; Komiya, Tomokazu; S.Li*; Z.Wang*; et al.

JAERI-Research 94-009, 44 Pages, 1994/07

JAERI-Research-94-009.pdf:1.69MB

no abstracts in English

JAEA Reports

Radionuclide migration behavior at the low adsorption region on the aerated soil testing, the second report; Effect of inflow volume and migration analysis

Takebe, Shinichi; Mukai, Masayuki; Komiya, Tomokazu; Kamiyama, Hideo

JAERI-M 93-034, 15 Pages, 1993/02

JAERI-M-93-034.pdf:0.74MB

no abstracts in English

JAEA Reports

Radionuclide migration behavior at the low adsorption region on the aerated soil testing

Takebe, Shinichi; Mukai, Masayuki; Komiya, Tomokazu; Kamiyama, Hideo

JAERI-M 92-205, 19 Pages, 1993/01

JAERI-M-92-205.pdf:0.77MB

no abstracts in English

JAEA Reports

Radionuclide transfer onto ground surface in surface water flow, 1; Disturbed loamy soil

Mukai, Masayuki; Takebe, Shinichi; Komiya, Tomokazu; Kamiyama, Hideo

JAERI-M 91-100, 17 Pages, 1991/07

JAERI-M-91-100.pdf:0.69MB

no abstracts in English

JAEA Reports

Migration behavior of radionuclide in soil layer of final storage; Radionuclide migration test in aerated soil layer by precipitation

Yamamoto, Tadatoshi; Takebe, Shinichi; Ogawa, Hiromichi; Tanaka, Tadao; Mukai, Masayuki; Komiya, Tomokazu; *;

JAERI-M 89-189, 18 Pages, 1989/11

JAERI-M-89-189.pdf:0.65MB

no abstracts in English

JAEA Reports

Migration behavior of radionuclide in soil layer of final storage site; Radionuclide migration test in aerated soil layer by radioactive contaminated water

Yamamoto, Tadatoshi; Takebe, Shinichi; Ogawa, Hiromichi; Tanaka, Tadao; Mukai, Masayuki; Komiya, Tomokazu; *;

JAERI-M 89-144, 23 Pages, 1989/10

JAERI-M-89-144.pdf:0.87MB

no abstracts in English

Oral presentation

Replacement technology for front acrylic panels of a large glovebox using bag-out/bag-in method

Numata, Masami; Komiya, Tomokazu; Sakuraba, Naotoshi; Usami, Koji; Kitagawa, Isamu; Tomita, Takeshi*

no journal, , 

no abstracts in English

Oral presentation

Thermal conductivity of minor actinide nitride solid solutions

Nishi, Tsuyoshi; Ito, Akinori; Takano, Masahide; Numata, Masami; Komiya, Tomokazu; Akabori, Mitsuo; Arai, Yasuo; Minato, Kazuo

no journal, , 

no abstracts in English

Oral presentation

Thermophysical properties of plutonium dioxide and americium dioxide

Nishi, Tsuyoshi; Ito, Akinori; Komiya, Tomokazu; Akabori, Mitsuo; Arai, Yasuo; Morimoto, Kyoichi; Kato, Masato

no journal, , 

no abstracts in English

Oral presentation

Investigation of similarity in vanadium on the corrosion acceleration effect by neptunium

Motooka, Takafumi; Kato, Chiaki; Komiya, Tomokazu; Yamamoto, Masahiro

no journal, , 

The effects on the corrosion acceleration of stainless steel by neptunium and vanadium were examined by re-oxidative behavior investigation and the corrosion test in boiling nitric acid solutions. As a result, it was suggested that the corrosion acceleration effect by Np was able to be simulated by vanadium by adjusting the amount of V and concentration of nitric acid.

Oral presentation

Development of volume reduction equipment for radioactive waste

Ichise, Kenichi; Sakuraba, Naotoshi; Suzuki, Kazuhiro; Miyata, Seiichi; Komiya, Tomokazu; Nishi, Masahiro; Kitagawa, Isamu; Numata, Masami

no journal, , 

As a part of measures to reduce radioactive wastes, which are generated during operation and maintenance of Waste Safety Testing Facility (WASTEF), we developed volume reduction equipment for $$beta$$$$gamma$$ and $$alpha$$ wastes. In this presentation, we report manufacture of an experimental model, its operativeness & verification of reduction effect in a mock-up test, improvements, and application to actual radioactive wastes.

Oral presentation

Technical support for planning and installation of simple ground repository; FY2011 status of support activities for promotion of decontamination in the Fukushima Environmental Safety Center, JAEA

Abe, Hironobu; Ikeda, Koki; Mikake, Shinichiro; Nagasaki, Yasushi; Niizato, Tadafumi; Asazuma, Shinichiro; Aoki, Isao; Ishikawa, Nobuyuki; Ishikawa, Hiroyasu; Ishizaki, Nobuhiro; et al.

no journal, , 

no abstracts in English

Oral presentation

JAEA's technical experiences and lessons learned for environmental remediation of Fukushima, 2; Technical supports for local governments (decontamination of concrete)

Hata, Katsuro; Ishikawa, Nobuyuki; Uesaka, Takahiro; Sudo, Tomoyuki; Matsumoto, Masaki; Aoki, Isao; Ishizaki, Nobuhiro; Imamura, Hiroaki; Uchida, Shinichi; Kikuchi, Sakae; et al.

no journal, , 

JAEA supports the decontamination activity that the local government of Fukushima carries out. In addition, JAEA carries out instruction and the advice about decontamination. I explain the concrete-based decontamination method of the house which polluted by the accident of the nuclear power plant.

Oral presentation

JAEAs technical experiences and lessons learned for environmental remediation of Fukushima

Aoki, Isao; Asazuma, Shinichiro; Sudo, Tomoyuki; Komiya, Tomokazu; Nakamura, Masahiko; Uchida, Shinichi; Kozawa, Masachiyo; Sonoda, Takashi; Mikake, Shinichiro; Ikeda, Koki; et al.

no journal, , 

JAEAs technical experiences and lessons learned for environmental remediationof Fukushima. (Technical supports for local governments)

Oral presentation

JAEA's technical experiences and lessons learned for environmental remediation of Fukushima technical supports for local governments

Kanazawa, Shingo; Sudo, Tomoyuki; Komiya, Tomokazu; Hata, Katsuro; Nakamura, Masahiko; Kozawa, Masachiyo; Ohata, Kiyoshi; Nanko, Masayuki; Hoshino, Masato; Uchida, Shinichi; et al.

no journal, , 

JAEA is working the decontamination activity for the environmental remediation of Fukushima. In this activity, we support the decontamination activity for local governments to devise actually decontaminate. In this report, we show the decontamination effect of a house.

21 (Records 1-20 displayed on this page)