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Kubo, Shinji; Yoshino, Koji*; Takemoto, Jumpei*; Kasahara, Seiji; Imai, Yoshiyuki; Onuki, Kaoru
JAEA-Technology 2012-037, 20 Pages, 2013/01
JAEA-Technology-2012-037.pdf:17.29MB
Densities of Bunsen reaction solutions in the iodine-sulfur process were measured with an oscillating U-tube density meter. Two types of the solutions were prepared to simulate sulfuric acid solutions and hydriodic acid solutions of the Bunsen reaction step. The former solution ranged in concentration from 0 to 45 wt% of sulfuric acid containing HI and I
of 0-2 mole%; the latter solution contained 0-17 mole% I, 1-15 mole% HI and 0-2 mole% HSO
. The temperature of the measured solution were 10-60 
C. It was found that, in both solutions, the effect of HI and I concentration on the density could well be represented by using a kind of mole fraction of iodine atom. Based on the finding, a set of correlation equations between the densities and the compositions were derived. Additionally, viscosities of ploy-hydriodic acid were measured using an oscillating viscosity meter in temperature range of 5-40 C, and in the composition range of 0-17 mole% I and 1-15 mole% HI; a empirical equation to calculate viscosity from the composition and the temperature are obtained.
Watahiki, Masatoshi; Akai, Masanori; Nakai, Koji; Iemura, Keisuke; Yoshino, Masanori*; Hirano, Hiroshi*; Kitamura, Akihiro; Suzuki, Kazunori
Nihon Genshiryoku Gakkai Wabun Rombunshi, 11(1), p.101 - 109, 2012/02
Gloveboxes used for plutonium fuel development and fabrication are eventually dismantled for replacement or decommissioning. Since equipment interior and the inner surface of gloveboxes are contaminated in radioactive materials, glovebox dismantling work is performed by workers wearing an air fed suit with mechanical tools in a plastic enclosure system to control the spread of contamination. Various improvements of enclosure system are implemented including modification of the rooms to decontaminate and undress the air fed suit and introduction of inflammable filter and safety film near the size reduction workspace against fire. We describe the countermeasures deployed in the enclosure system against potential hazards and how these devices work in the real dismantling activities.
Ikeda, Yoshitaka; Ide, Shunsuke; Suzuki, Takahiro; Kasugai, Atsushi; Takahashi, Koji; Kajiwara, Ken; Isayama, Akihiko; Oikawa, Toshihiro; Hamamatsu, Kiyotaka; Kamada, Yutaka; et al.
Nuclear Fusion, 42(4), p.375 - 382, 2002/04
Times Cited Count：28 Percentile：65.15(Physics, Fluids & Plasmas)no abstracts in English
Sakamoto, Yoshiteru; Kamada, Yutaka; Ide, Shunsuke; Fujita, Takaaki; Shirai, Hiroshi; Takizuka, Tomonori; Koide, Yoshihiko; Fukuda, Takeshi; Oikawa, Toshihiro; Suzuki, Takahiro; et al.
Nuclear Fusion, 41(7), p.865 - 872, 2001/07
Times Cited Count：106 Percentile：93.35(Physics, Fluids & Plasmas)no abstracts in English
Shinohara, Koji; Yoshino, Ryuji; Nazikian, R.*; Fujita, Takaaki; Kishimoto, Yasuaki
Europhysics Conference Abstracts, 23J, p.405 - 408, 1999/00
no abstracts in English
Shinohara, Koji; Nazikian, R. M.*; Fujita, Takaaki; Yoshino, Ryuji
Review of Scientific Instruments, 70(11), p.4246 - 4250, 1999/00
Times Cited Count：31 Percentile：84.36(Instruments & Instrumentation)no abstracts in English
Nazikian, R.*; Shinohara, Koji; Yoshino, Ryuji; Fujita, Takaaki; Shirai, Hiroshi; Kramer, G. J.*; JT-60 Team
Fusion Energy 1998, Vol.4, p.1689 - 1692, 1998/10
no abstracts in English
Takemoto, Jumpei; Yoshino, Koji; Kubo, Shinji; Kasahara, Seiji; Takahashi, Toshio*; Hino, Ryutaro
no journal, ,
no abstracts in English
Takemoto, Jumpei; Yoshino, Koji*; Imai, Yoshiyuki; Kubo, Shinji; Kasahara, Seiji; Takahashi, Toshio*; Hino, Ryutaro
no journal, ,
no abstracts in English
Hg in J-PARC Materials & Life Science Experimental FacilitySato, Koichi; Masuyama, Koichi; Tajima, Takahiro; Yoshino, Koji; Seki, Kazunari; Kasugai, Yoshimi; Miyamoto, Yukihiro
no journal, ,
Various kinds of experiments on material and biological science have been carried out using neutrons and muons generated by bombarding the mercury and muon target with high-energy (3 GeV) and high-intense (1MW) protons in the Materials and Life Science Experimental Faculty (MLF) of Japan Proton Accelerator Complex (J-PAPC). It was found that radioactive nuclide of Hg induced in the mercury target during the beam operation was released to the environment via the ventilation system from the stack at specific times during maintenance periods. The weekly-average concentrations of Hg in the stack were 2.4 
10
1.5 10
Bq/cm
, which was much less than the legal limit by a factor of 1/10,000. The release behavior of Hg will be reported in the presentation.
Tezuka, Masashi; Koda, Yuya; Nakanishi, Eitoku*; Sugiura, Koji*; Yoshino, Ichiro*; Hachikawa, Shuichi*
no journal, ,
Demonstratin of axial cutting against the condenser cooling tubes.
Masuyama, Koichi; Sato, Koichi; Yoshino, Koji; Tajima, Takahiro*; Seki, Kazunari; Kasugai, Yoshimi; Miyamoto, Yukihiro
no journal, ,
The mercury target vessel used in the Materials and Life Science Experimental Facility (MLF) in the Japan Accelerator Research Complex (J-PARC) needs to be replaced periodically. The replacement work, which is conducted in the hot cell, associates with release of radioactive materials produced via spallation reactions between protons and mercury. Therefore we monitored radioactivity of dust and air samples in the hot cell. By the monitoring, we newly found peculiar phenomena on the behavior of radioactive products, which is important for radiation control. In this work, we will show the monitoring data and the new observation.
Hikima, Ryoichi*; Yoshino, Osamu*; Hirano, Toru*; Ishiyama, Koji*; Morita, Yutaka; Sugita, Yutaka; Sano, Osamu*
no journal, ,
This report is one of the case studies that were carried out in order to contribute to the research and evaluation methods development of the impact of massive earthquakes in deep underground geological environment. We report the results of analysis of the changes in elastic wave velocity before and after relatively large-scale earthquake, by using elastic wave measurement data the period from 2005 to 2014. That measurement are continued for more than 20 years, in Iwate Prefecture Kamaishi mine tunnel which close to the epicenter of the off the Pacific coast Tohoku Earthquake.
Yoshino, Hiroyuki*; Fujisawa, Yasuo*; Kobayashi, Yuichi*; Sugita, Yutaka; Kageyama, Takeshi; Hane, Koji*; Sahara, Fumihiro*; Yabuki, Nobuyoshi*; Makanae, Koji*
no journal, ,
This paper reports development of ISRE (the Integrated System for Repository Engineering), as a knowledge management tool on the repository design and engineering technology, which manages and inherits the information and knowledge of each phase of the disposal project of the radioactive waste during around 100 years, which also enables reasonable design of the repository by using accumulated and integrated information. Content of this paper is current status of the prototype of the iSRE.
Hane, Koji*; Sahara, Fumihiro*; Sugita, Yutaka; Kageyama, Takeshi; Fujisawa, Yasuo*; Yoshino, Hiroyuki*; Kobayashi, Yuichi*; Yabuki, Nobuyoshi*; Makanae, Koji*
no journal, ,
This paper reports development of ISRE (the Integrated System for Repository Engineering), as a knowledge management tool on the repository design and engineering technology, which manages and inherits the information and knowledge of each phase of the disposal project of the radioactive waste during around 100 years, which also enables reasonable design of the repository by using accumulated and integrated information. Content of this paper is outline of trial utilization of the prototype of the iSRE and the extracted issues.
Matsui, Hiroya; Ishiyama, Koji*; Yoshino, Osamu*; Hikima, Ryoichi*; Sanoki, Satoru*; Hayashi, Kunihiko*; Takahashi, Masahiro*; Sato, Masaru*
no journal, ,
This paper is described about the results of collaboration study between Nishimatsu cop. and JAEA to estimate the applicability of high resolution elastic wave velocity measurement for understanding of a groundwater flow. The measurement was carried out in the vicinity of the groundwater recovery test drift in MIU and it continued for about three month from just after starting at the drainage of the test drift. The results suggested that the elastic wave velocity change were measured with groundwater flow due to drainage of the test drift and the high resolution elastic wave velocity measurement can be applicable for understanding of groundwater flow.
Ishiyama, Koji*; Yoshino, Osamu*; Hikima, Ryoichi*; Matsui, Hiroya; Ozaki, Yusuke; Takeuchi, Ryuji; Sakakibara, Junichi*; Sanoki, Satoru*; Hayashi, Kunihiko*
no journal, ,
In this study, we evaluate the high accurate elastic wave measurement system at the 500m stage in Mizunami underground research laboratory. We used the sine and pseudo random wave between 0.5 kHz and 20 kHz as source signals and received them by 6 receivers. We observed that the elastic wave became low speed and high attenuation around the zone where the rock classification was lower than surroundings. From this result, we could capture the damaged zone by elastic wave. For the capability of deeper exploration, we need to improve the transmission system.
