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Uno, Sadanori; Chiba, Atsuya; Yamada, Keisuke; Yokoyama, Akihito; Usui, Aya; Saito, Yuichi; Ishii, Yasuyuki; Sato, Takahiro; Okubo, Takeru; Nara, Takayuki; et al.
JAEA-Review 2013-059, JAEA Takasaki Annual Report 2012, P. 179, 2014/03
Three electrostatic accelerators at TIARA were operated on schedule in fiscal year 2012 except changing its schedule by cancellations of users. The yearly operation time of the 3 MV tandem accelerator, the 400 kV ion implanter and the 3MV single-ended accelerator were in the same levels as the ordinary one, whose operation time totaled to 2,073, 1,847 and 2,389 hours, respectively. The tandem accelerator had no trouble, whereas the ion implanter and the single-ended accelerator stopped by any troubles for one day and four days, respectively. The molecular ion beam of helium hydride was generated by the ion implanter, because the users required irradiation of several cluster ions in order to study the effect of irradiation. As a result, its intensity of beam was 50 nA at 200 kV. The ion beam of tungsten (W) at 15 MeV was accelerated by the tandem accelerator, whose intensity was 20 nA at charge state of 4+, because of the request from a researcher in the field of nuclear fusion.
Sugo, Yumi; Sasaki, Yuji; Ishioka, Noriko
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no abstracts in English
Naito, Hiroyuki; Ito, Chikara; Ito, Hideaki; Imaizumi, Kazuyuki; Ito, Keisuke
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no abstracts in English
Nakano, Junichi; Tsukada, Takashi; Yamagata, Ryohei
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The seawater was injected into the reactor cores in the Fukushima Daiichi Nuclear Power Plant. Dose in primary containment vessels (PCV) increased since the fuel debris fallen from Reactor Pressure Vessels (RPV) and fission products emitted radiation. Since oxygen, hydrogen peroxide, radicals etc. are produced by water radiolysis, it is considered that corrosion on the PCV and RPV steels would be caused. Corrosion tests in diluted artificial seawater at 50
C were performed under 
rays dose rate of 4.4 kGy/h and 0.2 kGy/h, and unirradiation. Hydrazine (N
H
) of 10 mg/L and 100 mg/L were added to the flasks to evaluate the effects of NH on corrosion under rays irradiation. In situation without NH, weight losses of the specimens irradiated with 0.2 kGy/h were similar to those of the unirradiated specimens. Weight losses of the specimens irradiated with 4.4 kGy/h were approximate 1.7 times those of the unirradiated specimens.
Tsuda, Shuichi; Sato, Tatsuhiko; Ogawa, Tatsuhiko
no journal, ,
Microdosimetric deposit energy spectra have been measured for various energetic heavy ion beams using a wall-less tissue equivalent proportional counter (wall-less TEPC) and used for the verification of the microdosimetric function for calculating y distributions incorporated in the PHITS code. In the previous studies, since uniformly spread beam were used to simulate a uniform irradiation to cells, the measured deposit energy spectra include the contribution of both incident heavy ion beams and secondarily produced electrons (delta rays). In this study, to investigate the radial dependence of y distributions, y distributions are measured in radial direction for energetic ions using the wall-less TEPC.
Hakoda, Teruyuki; Yamamoto, Shunya; Shimoyama, Iwao; Yoshikawa, Masahito; Aritani, Hirofumi*
no journal, ,
Water solution containing 1 mmol/L PtCl
ions and 0.5-20v% ethanol was irradiated with low energy electron beams. Production of thin films were observed on the surface of the irradiated solution. Rutherford backscattering spectrometry and X-ray photoelectron spectroscopy demonstrated that the thin films consisted of metal platinum and their production was accelerated at lower ethanol concentrations. Transmission electron microscope observation suggested that Pt particles with sizes of 2-5 nm are produced through reduction of PtCl ions at the surface of the solution. These Pt particles coagulated each other to form the films.
Tamada, Masao
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Takasaki advanced radiation research institute has three irradiation facilities of -ray, electron beam, and ion beams to support the applied research on quantum beam technology. Unique beam technologies for micro beam and single ion hit have been developed by combining techniques of flat-top acceleration and high stabilization of magnetic field for the cyclotron in ion beam irradiation facility to irradiate certain points in cells and semiconductor by ion beam, some micron meter in diameter. The advantage of quantum beam technology is to develop new-high-performance materials which cannot be produced by chemical methods. We will explore unique irradiation technology and novel seeds using the quantum beam technology and apply them for public benefit in the community.
Kawachi, Naoki; Yin, Y.-G.; Suzui, Nobuo; Ishii, Satomi; Koyanagi, Atsushi; Watabe, Hiroshi*; Yamamoto, Seiichi*; Fujimaki, Shu
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no abstracts in English
Shimada, Akihiko; Sugimoto, Masaki; Miyashita, Atsumi; Yoshikawa, Masahito
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Recovery from the accident at Tokyo Electric Power Company Fukushima Dai-ichi Nuclear Power Plant (NPP) is a matter of great urgency. In order to realize safe and secure operation for decontamination and decommissioning of NPP, it is indispensable to use equipments with sufficient radiation resistance (RR). In JAEA as well as other agency, various studies on RR of various materials and equipments have been conducted and a number of reports and papers have been published. Then, we started construction of a database named as "Database of Radiation Resistance on Polymer Materials and Equipments" and announced this database in a press release on June 1, 2012. At present, the database includes 878 data of materials, which are consisted of 423 data of polymer materials, 223 data of equipments and parts, 103 data of oils, fats and paintcoatings and 129 data of organic composite materials. The database will be extended and expected to be utilized for safe and secure operation.
-ray irradiation, 2Nakayama, Takuya; Kawato, Yoshimi; Suzuki, Shinji; Meguro, Yoshihiro
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no abstracts in English
Nakagawa, Akinori; Kogawara, Takafumi; Onizawa, Takashi*; Hanada, Keiji; Nakayama, Takuya; Meguro, Yoshihiro
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no abstracts in English
Miyashita, Atsumi; Yoshikawa, Masahito
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no abstracts in English
Suzui, Nobuo; Shibata, Takuya; Ishii, Satomi; Kawachi, Naoki; Yin, Y.-G.; Seko, Noriaki; Fujimaki, Shu
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no abstracts in English
-ray induced homologous recombinations in plantsSakamoto, Ayako; Toki, Seiichi*; Hidema, Jun*
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no abstracts in English
Matsuo, Yoichiro*; Izumi, Yoshinobu*; Hase, Yoshihiro; Sakamoto, Ayako; Shimizu, Kikuo*
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no abstracts in English
Inoue, Toshihiko; Yamashita, Shinichiro; Yamagata, Ichiro; Yoshitake, Tsunemitsu; Kaito, Takeji; Sekio, Yoshihiro; Hayashi, Takehiro
no journal, ,
Precipitation-strengthened high-nickel alloys have been developed for fuel cladding material in advanced reactor because of their intrinsic superior swelling property. In most case, Nimonic PE16 and these high-nickel alloys are strengthened by an intermetalic compound such as ordered phase gannma- formed in the matrix. The most important issue in development of high-nickel alloy is considered to be the improvement of mechanical properties at elevated temperature; the significant ductility loss due to irradiation at high temperature. The cause of this problem was believed to be the re-distribution of ordered phase gannma- and solute segregation to defect sink sites, such as grain boundary, dislocation and void surface, during irradiation. In this study, several types of precipitation-strengthened high-nickel alloys, which were stabilized by were carbide/nitride and gannma double prime phase, were developed and then the phase stability (precipitate stability and swelling resistance) in these alloys during irradiation was evaluated by utilizing TIARA facility. In the results, high nickel steel were confirmed more higher resistance of swelling than PNC316 steels.
Tanno, Takashi; Otsuka, Satoshi; Yamashita, Shinichiro; Yano, Yasuhide; Kaito, Takeji; Okubo, Nariaki; Jitsukawa, Shiro*; Sawai, Tomotsugu
no journal, ,
9Cr-ODS ferritic steel has been developed as the candidate material for fast reactor fuel cladding in JAEA. It is necessary to evaluate the stability of the dispersoid under heavy irradiation at high temperature because the cladding will be irradiated up to 250 dpa at 700C. From the perspective of corrosion resistance, 11Cr-ODS steel also has been developed. Increase of Cr can cause irradiation hardening and ductility decrease. This behavior should be evaluated. Thus we started the irradiation up to 250 dpa with Fe ion irradiation which can achieve high dose in respectively short time. Nano-indentation test showed that 9Cr-ODS steel was hardened due to 60 dpa irradiation at 400C. Irradiation hardening of 11Cr-ODS steel was smaller than that of 9Cr-ODS steel. The reason for the difference is seemed that the hardness of unirradiated 11Cr-ODS steel was larger than that of 9Cr-ODS steel. The irradiation will be continue to obtain data at higher dose.
Yokota, Wataru; Sato, Takahiro; Okumura, Susumu; Kurashima, Satoshi; Miyawaki, Nobumasa; Kashiwagi, Hirotsugu; Yoshida, Kenichi; Koka, Masashi; Yokoyama, Akihito; Kada, Wataru*; et al.
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no abstracts in English
and C ionsNarumi, Kazumasa; Chiba, Atsuya; Yamada, Keisuke; Matoba, Shiro; Saito, Yuichi
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Nakajima, Kaoru*; Morita, Yosuke*; Kitayama, Takumi*; Suzuki, Motofumi*; Kimura, Kenji*; Narumi, Kazumasa; Saito, Yuichi; Ishikawa, Norito; Hojo, Kiichi; Tsujimoto, Masahiko*; et al.
no journal, ,
no abstracts in English
