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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

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

Analytical surveillance of the nuclear waste package processing of the spent ion-exchange resin residual

Otani, Hiroshi; Bando, Fumio*; Endo, Nobuyuki*

Heisei-24-Nendo Zaidan Hojin Wakasawan Enerugi Kenkyu Senta kenkyu Nempo, 15, P. 89, 2013/10

no abstracts in English

Journal Articles

Analytical surveillance of the nuclear waste package processing of the spent ion-exchange resin residuals

Minehara, Eisuke*; Endo, Nobuyuki*

Heisei-23-Nendo Zaidan Hojin Wakasawan Enerugi Kenkyu Senta Nempo, 14, P. 49, 2012/10

no abstracts in English

Journal Articles

Application of sputter etching treatment to the formation of semiconducting silicide film on Si substrate

Yamaguchi, Kenji; Esaka, Fumitaka; Sasase, Masato*; Yamamoto, Hiroyuki; Hojo, Kiichi

Transactions of the Materials Research Society of Japan, 37(2), p.245 - 250, 2012/06

"Semiconducting silicides", such as $$beta$$-FeSi$$_2$$, BaSi$$_2$$, Mg$$_2$$Si, etc. are composed of elements which are non or less toxic and are naturally abundant, so that they are considered to be ecologically friendly. These materials are being investigated for applications in optoelectronics, photovoltaics, photonics, thermoelectrics, and so on. In order to fabricate silicide films on crystalline Si substrate, sputter-etching (SE) of the substrate with low energy ion beams has been successfully applied. When the conditions are met, a highly-oriented $$beta$$-FeSi$$_2$$ (100) film can be grown on Si (100) substrate by means of ion beam sputter deposition method. According to cross-sectional transmission electron microscopy (TEM) observation, the interface of the SE-treated substrate and the film deposited at 973 K is smooth, although some defects are produced as a result of this treatment. On the other hand, a combination of X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (XAS) revealed that relatively homogeneous $$beta$$-FeSi$$_2$$ surface is formed at this temperature. In order to further improve the film properties with smaller amount of defects, SE-treatment is performed with the ions whose incident energy is below 1 keV. X-ray diffraction (XRD) analysis confirmed that highly-oriented $$beta$$-FeSi$$_2$$ (100) film can be also obtained with SE-treatment by 0.8 keV Ne$$^+$$ ions, as in the case of 3.0 keV Ne$$^+$$.

Journal Articles

Quasi-monochromatic pencil beam of laser-driven protons generated using a conical cavity target holder

Nishiuchi, Mamiko; Pirozhkov, A. S.; Sakaki, Hironao; Ogura, Koichi; Esirkepov, T. Z.; Tanimoto, Tsuyoshi; Kanasaki, Masato; Yogo, Akifumi; Hori, Toshihiko; Sagisaka, Akito; et al.

Physics of Plasmas, 19(3), p.030706_1 - 030706_4, 2012/03

 Times Cited Count:6 Percentile:68.9(Physics, Fluids & Plasmas)

A 7 MeV proton beam collimated to 16 mrad containing more than $$10^6$$ particles is experimentally demonstrated by focusing a 2J, 60 fs pulse of a Ti:sapphire laser onto targets of different materials and thicknesses placed in a millimeter scale conical holder. The electric potential induced on the target holder by laser-driven electrons accelerates and dynamically controls a portion of a divergent quasi-thermal proton beam originated from the target, producing a quasi-monoenergetic "pencil" beam.

Journal Articles

Development of laser cutting technology for reactor decommissioning process

Kobayashi, Kojiro*; Ida, Toshio*; Yamaguchi, Takeshi*; Daido, Hiroyuki; Muramatsu, Toshiharu; Sano, Kazuya; Tsuboi, Akihiko*; Shamoto, Hideyasu*; Ikeda, Takeshi*

Reza Kako Gakkai-Shi, 19(1), p.63 - 67, 2012/03

Laser cutting method, is that the metal melted by laser power is removed by assist gas, has some advantages which are high speed cutting and narrow line-width cutting for the thin metal. We has conducted the joint research with the relevant organizations on the R&D of the laser cutting technology for cutting stainless and carbon steel of over the 150 mm thickness which is maximum thickness of core structure in Fugen. We report the R&D plan and the current status of the laser cutting test.

Journal Articles

Radiation effects on film formation and nanostructural changes of iron disilicide thin film

Sasase, Masato*; Yamamoto, Hiroyuki; Okayasu, Satoru

Nuclear Instruments and Methods in Physics Research B, 272, p.318 - 321, 2012/02

 Times Cited Count:0 Percentile:100(Instruments & Instrumentation)

Radiation effects for film formation and nanostructural changes of iron disilicide thin film have been discussed.

Journal Articles

Formation of atomically flat $$beta$$-FeSi$$_{2}$$/Si(100) interface using ion irradiated substrate

Sasase, Masato*; Yamamoto, Hiroyuki; Kurata, Hiroki*

Thin Solid Films, 520(9), p.3490 - 3492, 2012/02

 Times Cited Count:0 Percentile:100(Materials Science, Multidisciplinary)

Thin uniform $$beta$$-FeSi$$_{2}$$ films were fabricated on ion irradiated Si(100) substrates to achieve an atomically flat interface. Ion irradiation produces a surface with more defects than chemical etching, however, it is expected that the presence of defects can promote the formation of compound films such as $$beta$$-FeSi$$_{2}$$ that require interdiffusion and reaction processes. However, excess defects can also result in random nucleation, poor crystallinity and a rough interface. Cross-sectional transmission electron microscopy was used to determine the optimum conditions for ion irradiation of the substrate to obtain a clear $$beta$$-FeSi$$_{2}$$/Si interface.

Journal Articles

Measurement of fluorine distribution in carious enamel around 1.5-year aged fluoride-containing materials

Komatsu, Hisanori*; Kojima, Kentaro*; Funato, Yoshiki*; Matsuda, Yasuhiro*; Kijimura, Taiki*; Okuyama, Katsushi*; Yamamoto, Hiroko*; Iwami, Yukiteru*; Ebisu, Shigeyuki*; Nomachi, Masaharu*; et al.

JAEA-Review 2011-043, JAEA Takasaki Annual Report 2010, P. 85, 2012/01

Journal Articles

Behavior data acquisition and research of the cutting dust by laser cutting method in the air for decommissioning of Fugen Decommissioning Engineering Center

Shigeta, Tatsuo*; Sasase, Masato*; Endo, Nobuyuki*; Nagatomo, Jinro*

Heisei-22-Nendo Zaidan Hojin Wakasawan Enerugi Kenkyu Senta Nempo, 13, P. 73, 2011/10

no abstracts in English

Journal Articles

Laser cutting technologies under water for the nuclear reacter dismantlement

Kobayashi, Kojiro*; Ida, Toshio*; Yamaguchi, Takeshi*; Daido, Hiroyuki; Muramatsu, Toshiharu; Sano, Kazuya; Tsuboi, Akihiko*; Shamoto, Hideyasu*; Ikeda, Takeshi*

Yosetsu Gijutsu, 59(7), p.64 - 69, 2011/07

no abstracts in English

Journal Articles

Research on swelling behavior of ion irradiation for fuel cladding in fast reactor

Sasase, Masato*

Heisei-21-Nendo Zaidan Hojin Wakasawan Enerugi Kenkyu Senta Nempo, 12, P. 52, 2010/10

no abstracts in English

Journal Articles

Behavior data acquisition and research of the cutting dust by the mechanical and thermal cutting method for decommissioning of Fugen Decommissioning Engineering Center

Shigeta, Tatsuo*; Amada, Kenichi*; Sasase, Masato*; Endo, Nobuyuki*; Nagatomo, Jinro*

Heisei-21-Nendo Zaidan Hojin Wakasawan Enerugi Kenkyu Senta Nempo, 12, P. 78, 2010/10

no abstracts in English

Journal Articles

Research on hydrogen purification system containing basic test, 6

Amada, Kenichi*; Nagatomo, Jinro*; Kobayashi, Shigetada*

Heisei-21-Nendo Zaidan Hojin Wakasawan Enerugi Kenkyu Senta Nempo, 12, p.61 - 62, 2010/10

For the purpose of improving hydrogen purification method, feasibility of impurity concentration by temperature/pressure swinging and automated continued operation experiments were conducted, based on a series of fundamental tests conducted till FY2008. The assumed hydrogen generation method is the hybrid thermo-chemical method and the assumed main impurity gas is hydrogen sulfide. A set of design and installation technical information items for a pilot-scale hybrid thermo-chemical hydrogen generation plant have been studied and compiled.

Journal Articles

X-ray photoelectron and X-ray absorption spectroscopic study on $$beta$$-FeSi$$_{2}$$ thin films fabricated by ion beam sputter deposition

Esaka, Fumitaka; Yamamoto, Hiroyuki; Matsubayashi, Nobuyuki*; Yamada, Yoichi*; Sasase, Masato*; Yamaguchi, Kenji; Shamoto, Shinichi; Magara, Masaaki; Kimura, Takaumi

Applied Surface Science, 256(10), p.3155 - 3159, 2010/03

 Times Cited Count:14 Percentile:42.96(Chemistry, Physical)

A combination of X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (XAS) using synchrotron radiation is applied to clarify surface chemical states of $$beta$$-FeSi$$_{2}$$ films fabricated by an ion-beam sputtering deposition method. The differences in the chemical states of the films fabricated at substrate temperatures of 873, 973 and 1173 K are investigated.

129 (Records 1-20 displayed on this page)