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Journal Articles

Investigation for dust behavior of cutting in air and cutting underwater by thermal cutting methods

Soejima, Goro; Iwai, Hiroki; Nakamura, Yasuyuki; Tsuzuki, Satoshi*; Yasunaga, Kazushi*; Kume, Kyo*

Heisei-29-Nendo Koeki Zaidan Hojin Wakasawan Enerugi Kenkyu Senta kenkyu Nempo, 20, P. 80, 2018/11

We investigated the behavior of the dust generated by Laser and Plasma-arc cutting underwater and in air aimed at the simulant material of reactor components (SUS304) and the pressure and calandria tube (Zr-2.5%Nb, Zry-2) of the prototype reactor "FUGEN".

Journal Articles

Study of the dust behavior on the laser and plasma cutting

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

Journal Articles

Preliminary re-conditioning test of the bituminization for radioactive wastes

Soejima, Goro; Takiya, Hiroaki; Mizui, Hiroyuki; Fujita, Yoshihiko*; Akari, Eisaku*; Endo, Nobuyuki*; Kume, Kyo*

Heisei-27-Nendo Koeki Zaidan Hojin Wakasawan Enerugi Kenkyu Senta kenkyu Nempo, 18, P. 14, 2016/10

We have performed the preliminary re-conditioning test of the bituminization for radioactive wastes applying to the technical criteria by non-radioactive samples. As a result, we have confirmed the applicability to secure homogeneity that is a part of the technical criteria by evaluating sample properties.

Journal Articles

Estimation of radioactive substance penetration in basement concrete

Tezuka, Masashi; Koda, Yuya; Fujita, Yoshihiko*; Kume, Kyo*

Heisei-26-Nendo Koeki Zaidan Hojin Wakasawan Enerugi Kenkyu Senta kenkyu Nempo, 17, P. 78, 2015/10

In order to contribute to the segregated management in accordance with the level of contamination such as dismantling products, as a basis frame concrete specimens of the condenser, which has been laid in the turbine building of the "Fugen", pre-observation of such cracks status of surface on which was carried out to investigate the pollution status of internal specimen.

Journal Articles

Review on conformance to technical criteria for near surface disposal

Tezuka, Masashi; Koda, Yuya; Fujita, Yoshihiko*; Endo, Nobuyuki*; Kume, Kyo*

Heisei-26-Nendo Koeki Zaidan Hojin Wakasawan Enerugi Kenkyu Senta kenkyu Nempo, 17, P. 78, 2015/10

In FUGEN, asphalt solidified body which was solidified the concentrated liquid waste is, some of them might also be present which do not meet the criteria (buried technical standards) according to the buried disposal of waste Therefore, these can not be buried disposal remain status quo. Therefore, it is assumed that that may not conform to the above criteria, "Asphalt solid material" is to conform to the reference to "re-processing", in addition to the desk study on specific measures, and also to preliminary tests I went.

Journal Articles

Estimation of radioactive substance penetration in basement concrete

Mizui, Hiroyuki; Fujita, Yoshihiko*; Kume, Kyo*

Heisei-25-Nendo Koeki Zaidan Hojin Wakasawan Enerugi Kenkyu Senta kenkyu Nempo, 16, P. 67, 2014/10

no abstracts in English

Journal Articles

Analytical surveillance on production methods of homogeneous and uniform solid materials from spent ion exchange residuum after ion coupled plasma volume-reduction process

Otani, Hiroshi; Mizui, Hiroyuki; Higashiura, Norikazu; Bando, Fumio*; Endo, Nobuyuki*; Yamagishi, Ryuichiro*; Kume, Kyo*

Heisei-25-Nendo Koeki Zaidan Hojin Wakasawan Enerugi Kenkyu Senta kenkyu Nempo, 16, P. 66, 2014/10

no abstracts in English

Journal Articles

Estimation of radioactive substance osmosis in basement concrete

Mizui, Hiroyuki; Ito, Hideki*; Kume, Kyo*

Heisei-24-Nendo Zaidan Hojin Wakasawan Enerugi Kenkyu Senta kenkyu Nempo, 15, P. 88, 2013/10

Radioactive substance osmosis in basement concrete has been estimated, to contribute disposal as NR waste in Fugen decommissioning engineering center.

Journal Articles

Innovation of hyper thermo therapy by laser and terahertz beam technology against cancer

Ishiyama, Shintaro; Miyoshi, Norio*; Idehara, Toshitaka*; Bibin, A.*; Kume, Kyo*; Matsumura, Akira*; Shtil, A. A.*

Hikari Araiansu, 23(12), p.19 - 23, 2012/12

To create new complete therapy for integrating various quantum beams, highly coalesed quantum beam science and technology are developing including neutron, X-ray, electron, synchrotron radiation and laser beams against cancer. This paper emphasizes the effectiveness of highly coalesced quantum beam science and technology in cancer, quoting case reports from promise in tests involving tumor model.

Journal Articles

Study on defects in H$$^+$$ ion implanted B2 type Fe-Al alloy using slow positron beam

Komagata, Eiichi*; Kawasuso, Atsuo; Yabuuchi, Atsushi*; Maekawa, Masaki; Batchuluun, C.*; Yasuda, Keisuke*; Ishigami, Ryoya*; Kume, Kyo*; Iwase, Akihiro*; Hori, Fuminobu*

Physics Procedia, 35, p.75 - 79, 2012/00

 Times Cited Count:2 Percentile:34.58

Fe48-at.% Al alloy were implanted with 50 keV H$$^+$$ ions to the fluence of 3$$times$$10$$^{16}$$ and 1$$times$$10$$^{18}$$ /cm$$^2$$ at room temperature. Positron annihilation Doppler broadening and lifetime measurements for these alloys have been carried out using slow positron beam apparatus with an energy range of 0.2 to 30.2 keV. The positron annihilation S-parameter decreased by H$$^+$$ ion irradiation. Also the positron lifetimes for hydrogen deposited region in the alloy decreased by the irradiation. These results show that implanted H atoms were trapped by vacancy type defects.

JAEA Reports

None

Kume, Kyo*; Otani, Nobuo*

JNC-TJ4440 2004-003, 287 Pages, 2005/03

JNC-TJ4440-2004-003.pdf:26.52MB

no abstracts in English

Journal Articles

Development of the neutron detection system for the measurement from thermal region to fast region

Kume, Kyo*; Otani, Nobuo*; Tamagawa, Yoichi*

Heisei-16-Nendo Zaidan Hojin Wakasawan Enerugi Kenkyu Senta Kenkyu Seika Hokokushu, 7, p.29 - 32, 2005/00

The neutron detection systems for the measurement covering wide energy range from thermal to fast region has been successively developed. The main part of this system is made of organic scintillators (both liquid and plastic) with doped 10B, so that it should be sensitive to thermal neutrons with (n,$$alpha$$) reaction while it could detect signals during degrading fast neutrons within the scintillator. This principle was verified. Also another system made of inorganic crystals was verified to see the capability to be used as a neutron detector.

JAEA Reports

Development of the Environmental Neutron Detection System

Kume, Kyo*; Otani, Nobuo*

JNC-TJ4440 2003-007, 312 Pages, 2004/03

JNC-TJ4440-2003-007.pdf:42.33MB

Environmental neutron detection system is proposed. The main goal of this system was set to detect fast and thermal neutrons with the identical detector setup without degraders. A detector setuup for thermal neutron counting in prebious years, was developed first. Feasible study of this detector system for fast neutron counting was done, with help of Monte Carlo simulation and analysis of experiments with both a neutron source and neutron beam at an accelerator facility. In addition, B doped plastic intillator was studied for measurement of environmental neutrons. This was done through experiments with an Am-Be neutron source, with help of Monte Carlo simulation. In the meantime, possibility of the use of inorganic scintillators in neutron counting was verified, to solve the problems occuring at the long term use of the organic liquid scintillators. The detectors checked were BGO, GSO, and Nal. BGO was shown that it has little possibility for use at neutron measurement, while GSO and Nal were shown that these detectors have trivial sensitivity in neutron measurement.

JAEA Reports

None

Ito, Yoshifumi*; Kume, Kyo*; Otani, Nobuo*

JNC-TJ4440 2003-002, 284 Pages, 2003/03

JNC-TJ4440-2003-002.pdf:11.68MB

no abstracts in English

JAEA Reports

None

Kume, Kyo*

JNC-TJ4440 2003-001, 224 Pages, 2003/03

JNC-TJ4440-2003-001.pdf:6.9MB

no abstracts in English

JAEA Reports

None

Kume, Kyo*

JNC-TJ4400 2002-002, 90 Pages, 2002/03

JNC-TJ4400-2002-002.pdf:2.98MB

None

Oral presentation

Development of position assessment methods for atmospherically-released radioactivity, 1; Position assessment using an unfolding method

Ishizuka, Akihiro; Nozaki, Tatsuo; Kokubun, Yuji; Okubo, Koichi; Torii, Tatsuo; Takata, Takushi*; Kume, Kyo*; Hasegawa, Takashi*; Sugita, Takeshi*

no journal, , 

The assessment methods of types and distributions of a radioactivity unexpectedly released to atmosphere from nuclear power plants have been studied with a help of examination of data measured by $$gamma$$-ray detectors at several radiation monitoring equipments. The principle was verified with a $$gamma$$-ray source in room, and an existing nuclear power station was simulated as an application example.

Oral presentation

Development of position assessment methods for atmospherically-released radioactivity, 2; Implementation for higher count rate situations

Takata, Takushi*; Ishizuka, Akihiro; Nozaki, Tatsuo; Kokubun, Yuji; Okubo, Koichi; Torii, Tatsuo; Kume, Kyo*; Otani, Nobuo*; Hasegawa, Takashi*

no journal, , 

The assessment methods of a radioactivity distribution unexpectedly released to atmosphere from nuclear power plants have been studied using a single channel analyzing technique. A combination of this single channel analyzing technique and a detector sensitive to a solid angle of an incident $$gamma$$-ray was examined to assess the same purpose.

Oral presentation

Study on radioactive substance osmosis for basis concrete of equipment

Mizui, Hiroyuki; Ito, Hideki*; Kume, Kyo*; Ogawa, Hideo*; Kaneda, Yoshihisa*

no journal, , 

Radioactive substance osmosis for basis concrete of equipment was estimated, to treat and dispose in decommissioning project of Fugen Decommissioning Engineering Center (Fugen). In this study, the osmosis of Cobalt (non-radioactive) in liquid to concrete was observed by using PIXE method and others. And, the crack depth was measured by using UT method and others. As a result, it was confirmed that radioactive substance was osmosed to depth of crack, if Cobalt in liquid was touched with the crack of concrete, but the hydrophobic coatings of surface protect the liquid osmosis in short time. And, the relationship between crack depth and liquid osmosis was observed as nearly correlation. The continuous study at Fugen will establish the estimation method for area of osmosis contamination possibilities for basis concrete of equipment in the near future.

Oral presentation

Measurement of radiation caused by thunderstorm activities by a sounding balloon, an airplane, and the ground

Torii, Tatsuo; Sanada, Yukihisa; Yamada, Tsutomu; Orita, Tadashi; Muraoka, Koji*; Sato, Masayuki*; Watanabe, Akira*; Kume, Kyo*; Hasegawa, Takashi*; Sugita, Takeshi*

no journal, , 

Energetic radiation caused by thunderstorm activity is observed at various places, such as the ground, high mountain areas, and artificial satellites. In order to investigate the radiation source and its energy distribution, we measured energetic radiation by a sounding balloon, an airplane, and the ground observation. On the measurement inside the thundercloud, we conducted a sounding observation using a radiosonde mounted two GM tubes (for $$gamma$$-rays, and for $$beta$$/$$gamma$$-rays), in addition to meteorological instruments. The balloon passed through a region of strong echoes in a thundercloud shown by radar image, at which time an increase in counting rate of the GM tube about 2 orders of magnitude occurred at the altitude from 5 km to 7.5 km. Furthermore, the counting rate of 2 GM tubes indicated the tendency different depending on movement of a balloon. This result suggests that the ratio for the $$gamma$$-rays (energetic photons) of the beta-rays (energetic electrons) varies according to the place in the thundercloud. Then, we measured the variation of the energetic radiation from the top of the thundercloud using an airplane. At this time, we used two NaI detectors different in the size. We performed the radiation measurement by flying around the thunderclouds at 12 - 14 km in height by the observation in the summer. Moreover, in the winter season, we flew 5 - 6 km in height and measured the radiation around the thunderclouds. Furthermore, we carried out a ground observation of the energetic $$gamma$$ rays during winter thunderstorm at a coastal area facing the Sea of Japan. Two types of the energetic radiation have been observed at this time. We report the outline of these measurements and analysis in the session of the JpGU meeting.

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