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Koyama, Shinichi; Nakagiri, Toshio; Osaka, Masahiko; Yoshida, Hiroyuki; Kurata, Masaki; Ikeuchi, Hirotomo; Maeda, Koji; Sasaki, Shinji; Onishi, Takashi; Takano, Masahide; et al.
Hairo, Osensui Taisaku jigyo jimukyoku Homu Peji (Internet), 144 Pages, 2021/08
JAEA performed the subsidy program for the "Project of Decommissioning and Contaminated Water Management (Development of Analysis and Estimation Technology for Characterization of Fuel Debris (Development of Technologies for Enhanced Analysis Accuracy and Thermal Behavior Estimation of Fuel Debris))" in 2020JFY. This presentation summarized briefly the results of the project, which will be available shortly on the website of Management Office for the Project of Decommissioning and Contaminated Water Management.
Sakanaka, Shogo*; Akemoto, Mitsuo*; Aoto, Tomohiro*; Arakawa, Dai*; Asaoka, Seiji*; Enomoto, Atsushi*; Fukuda, Shigeki*; Furukawa, Kazuro*; Furuya, Takaaki*; Haga, Kaiichi*; et al.
Proceedings of 1st International Particle Accelerator Conference (IPAC '10) (Internet), p.2338 - 2340, 2010/05
Future synchrotron light source using a 5-GeV energy recovery linac (ERL) is under proposal by our Japanese collaboration team, and we are conducting R&D efforts for that. We are developing high-brightness DC photocathode guns, two types of cryomodules for both injector and main superconducting (SC) linacs, and 1.3 GHz high CW-power RF sources. We are also constructing the Compact ERL (cERL) for demonstrating the recirculation of low-emittance, high-current beams using above-mentioned critical technologies.
Masuda, Kenta; Oda, Chie; Nakanishi, Hiroshi*; Sasaki, Ryoichi*; Takase, Toshio*; Akagi, Yosuke*; Fujita, Hideki*; Negishi, Kumi*; Honda, Akira
JAEA-Research 2008-104, 194 Pages, 2009/03
JAEA-Research-2008-104.pdf:9.43MB
Saline groundwater contains high concentrations of chloride ions, which possibly elevate the pH of cement pore water by reacting with hydrogarnet and producing Friedel's salt. Calcium aluminate hydrates and portlandite, which can be found in hydrated ordinary Portland cement (OPC), were immersed in a sodium chloride solution, which had concentrations similar to those found in seawater.
Ishitoya, Kimihide; Nakatani, Takayoshi; Funabashi, Hideyuki; Sasaki, Ryoichi*; Takase, Toshio*; Kurosawa, Mitsuru*
JAEA-Research 2008-092, 64 Pages, 2008/12
JAEA-Research-2008-092.pdf:6.33MBJAEA-Research-2008-092(errata).pdf:0.23MB
In this study, some scenarios for safety assessments were developed. According to each developed scenario, the parameters were set up for dose calculation. Calculated results were analyzed and summarized from the viewpoints of effects of radionuclide migration parameters such as release coefficient, distribution coefficient, ground water velocity and migration distance. Dose more than 10 
Sv/y was calculated in some cases. Increase of ground water velocity or decrease of distribution coefficient caused by sea water inflow into migration path influenced slightly on the dose excess. In case of rapid change of the parameters, severe influences on the dose excess were observed. But, it wasn't thought that this rapid change would happen actually. On the other hand, in case of linear assumption of parameter change from 10,000 y to 100,000 y, dose less than 10 Sv/y was calculated.
Sakanaka, Shogo*; Ago, Tomonori*; Enomoto, Atsushi*; Fukuda, Shigeki*; Furukawa, Kazuro*; Furuya, Takaaki*; Haga, Kaiichi*; Harada, Kentaro*; Hiramatsu, Shigenori*; Honda, Toru*; et al.
Proceedings of 11th European Particle Accelerator Conference (EPAC '08) (CD-ROM), p.205 - 207, 2008/06
Future synchrotron light sources based on the energy-recovery linacs (ERLs) are expected to be capable of producing super-brilliant and/or ultra-short pulses of synchrotron radiation. Our Japanese collaboration team is making efforts for realizing an ERL-based hard X-ray source. We report recent progress in our R&D efforts.
Murai, Yuichi*; Oiwa, Hiroshi; Sasaki, Toshio*; Kondo, Masahiko; Yoshikawa, Shinji; Yamamoto, Fujio*
Measurement Science and Technology, 16(7), p.1459 - 1468, 2005/07
Times Cited Count：31 Percentile：81.42(Engineering, Multidisciplinary)Air-water two-phase flow in a helically coiled tube is investigated using backlight imaging tomography to elucidate the effect of centrifugal acceleration on phase distribution and interfacial structure. Superficial velocities up to 6m/s in 20mm-diameter tube are tested. We focused on a slug flow regime in which centrifugal acceleration dominates the flow. The interfacial structure is visualized in six directions using a set of originally designed mirror-mounted water jackets. A temporal expansion image is made from line-sampled images, and is used to reconstruct phase distribution through a linear backward projection algorithm. The present topography measurement showed various new features of gas-liquid two-phase flow in a helically coiled tube, such as a wall-covering effect in the case of high superficial velocity.
Oiwa, Hiroshi; Murai, Yuichi*; Sasaki, Toshio*; Yoshikawa, Shinji; Yamamoto, Fujio*
Proceedings of 4th World Congress on Industrial Process Tomography, Vol.1, p.428 - 433, 2005/00
We carried out reflection seismic and multi-offset VSP surveys at JNC Shobasama-site to develop the investigation technique in the granite area, and evaluated the applicability of these geophysical methods. As the result of this study, we consider that a) It is possible to infer the existence of the lower angle fracture zone in the granite by eflection seismic survey and b) Multi-offset VSP supplements the result of reflection seismic survey and it is possible to infer the distribution of the fracture zone in deeper area in the granite.
Kuroda, Toshimasa*; Sato, Kazuyoshi; Akiba, Masato; Ezato, Koichiro; Enoeda, Mikio; Osaki, Toshio*; Kosaku, Yasuo; Sato, Satoshi; Sato, Shinichi*; Suzuki, Satoshi*; et al.
JAERI-Tech 2002-044, 25 Pages, 2002/03
JAERI-Tech-2002-044.pdf:2.68MB
no abstracts in English
Kaminaga, Masanori; Haga, Katsuhiro; Aso, Tomokazu; Kinoshita, Hidetaka; Kogawa, Hiroyuki; Ishikura, Shuichi*; Terada, Atsuhiko*; Kobayashi, Kaoru*; Adachi, Junichi*; Teraoku, Takuji*; et al.
Proceedings of American Nuclear Society Conference "Nuclear Applications in the New Millennium" (AccApp-ADTTA '01) (CD-ROM), 9 Pages, 2002/00
no abstracts in English
Sasaki, Katsuji*; Fukuma, Toshio*; Hagiwara, Ikuo*; Kuroki, Hisatatsu*
JNC TJ7420 2005-017, 54 Pages, 1999/03
JNC-TJ7420-2005-017.pdf:8.89MB
Paleostress reconstruction using the multiple inverse method is atemmpted at Kakegawa, Miyazaki and Seto region.
Okada, Toshio; *; *; *; *; Miyake, Osamu; Sasaki, Shuichi
PNC TN1410 94-006, 57 Pages, 1994/11
no abstracts in English
Kuroha, Mitsuo; Takeda, Kunio; Iitsuka, Shoji; Sasaki, Shuichi; Okada, Toshio; Isozaki, Mikio; Daigo, Yoshimichi; Sato, Minoru
PNC TN941 81-49, 204 Pages, 1981/05
PNC type in-sodium hydrogen meters have been developed as leak detectors for LMFBR MONJU steam generators. In order to confirm the long-term reliability and the durability of the meters, the four meters were installed in three sodium loops at the O-arai Engineering Center, and they had been tested over a long time in flowing sodium. A period of the test was from oct. 1977 to Feb. 1980. They are called type II. The dynamic chamber of the vacuum system can separate from the static one, and be also connected with it using one flexible tube. Important findings from the test are; (1) The operating time of two meters exceeded 10,000 hours, and the total of all meters was about 35,000 hours. No trouble had been experienced in the sodium systems and the nickel membranes of them during the period, which had the good durability. Air leaks, however, occured three times in the two vacuum systems. (2) Any secular changes had hardly happened in the permeability of hydrogen through the nickel membrane and the relationship between ion pump current and hydrogen pressure. (3) The pumping speeds had decreased with increasing the amount of absorbed hydrogen. The decreasing rates differed among four ion pumps, and those of two pumps were considerably large at the beginning of absorbing hydrogen. (4) The calibration curves, which describe the relationship between hydrogen concentration in sodium and ion pump current, had changed with time. The largest cause was the decrement of the pumping speeds. (5) The UHV gauges were superior to the ion pumps from the point of the signal-to-noise ratio as the hydrogen sensor.
Nonaka, Akira*; Yoshimatsu, Kenji*; Sato, Koichi*; Maegawa, Toshio*; Sasaki, Shizuo*; Umetsu, Tomotake*; Sato, Satoshi
no journal, ,
no abstracts in English
Umetsu, Tomotake*; Yoshimatsu, Kenji*; Sato, Koichi*; Maegawa, Toshio*; Sasaki, Shizuo*; Nonaka, Akira*; Sato, Satoshi
no journal, ,
no abstracts in English
Nakanishi, Hiroshi; Honda, Akira; Oda, Chie; Sasaki, Ryoichi; Fujita, Hideki*; Negishi, Kumi*; Takase, Toshio*; Akagi, Yosuke*
no journal, ,
no abstracts in English
Nakatani, Takayoshi; Funabashi, Hideyuki; Ishitoya, Kimihide; Sasaki, Ryoichi*; Takase, Toshio*; Kurosawa, Mitsuru*
no journal, ,
no abstracts in English
Sasaki, Naoki*; Kakimi, Yukitaka*; Hirao, Toshio; Oshima, Takeshi; Onoda, Shinobu
no journal, ,
no abstracts in English
