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Saito, Yuya; Tanai, Kenji; Kikuchi, Hirohito*; Hirai, Takashi*; Nishimura, Mayuka*
JAEA-Research 2008-010, 35 Pages, 2008/03
JAEA-Research-2008-010.pdf:15.56MB
Site with the potential to adversely affect the performance of the disposal system should be avoided by site selection in Japan. On the other hand, according to Atomic Energy Commission, the possibility to occur the natural and artificial events suddenly should be examined. So it is important to examine about the critical state of the engineering barrier system (EBS) when if the fault move across the EBS. And this study helps to be understood by the nation. In this paper, we examined the influence of the velocity of fault movement by the model test, and tried to improve the precision of the simulation analysis. Test results showed that the total pressure of the buffer inside was about 20% decreased when the velocity was a one-tenth. And it is important to set the permeability of the near-field rock appropriately when simulating the behavior of the buffer material affected by fault movement.
Tanai, Kenji; Jintoku, Takashi*; Kikuchi, Hirohito*; Nishimura, Mayuka; Matsumoto, Kazuhiro*; Aoyanagi, Shigeo; Yui, Mikazu
JAEA-Research 2006-035, 32 Pages, 2006/06
JAEA-Research-2006-035.pdf:3.46MB
In order to contribute to the safety standards and guidelines which a regulator decides, state-of the art assessment method is investigated and summarized in the table about performance guarantee contents of buffer material related to the mechanical support and protection of the overpack and rock matrix, and the retardation of radionuclide. In addition, examples of the assessment tool are described. In this report, summary of (1) basic properties of bentonite, including swelling properties, mechanical properties and hydraulic properties, (2) long-term behavior of bentonite, including creep deformation, penetration into host rock, erosion and alteration, (3) gas permeability, (4) colloid filtration and (5) mechanical stability of the near-field is described. Check points, assessment methods (based on the data obtained from the experimental results, the estimation value obtained from empirical equations and database, and the modeling calculations) and latest results of these R&D programs were also summarized.
Aoyanagi, Shigeo; Yui, Mikazu; Tanai, Kenji; Kawakami, Susumu; Fujita, Tomoo; Taniguchi, Naoki; Shibata, Masahiro; Konishi, Kazuhiro; Nishimura, Mayuka; Kikuchi, Hirohito*; et al.
JAEA-Review 2006-014, 61 Pages, 2006/03
JAEA-Review-2006-014.pdf:5.03MB
no abstracts in English
Aoyanagi, Shigeo; Oda, Yoshihiro; Sasamoto, Hiroshi; Shibata, Masahiro; Tanai, Kenji; Taniguchi, Naoki; Nishimura, Mayuka; Fujisaki, Kiyoshi; Kikuchi, Hirohito*; Matsumoto, Kazuhiro*
Hoshasei Haikibutsu Anzen Kenkyu Nenji Keikaku (Heisei-13-Nendo
Heisei-17-Nendo) Kenkyu Seika Hokokushu, p.179 - 203, 2006/03
no abstracts in English
Tsuzuki, Kazuhiro; Kimura, Haruyuki; Kawashima, Hisato; Sato, Masayasu; Kamiya, Kensaku; Shinohara, Koji; Ogawa, Hiroaki; Hoshino, Katsumichi; Bakhtiari, M.; Kasai, Satoshi; et al.
Nuclear Fusion, 43(10), p.1288 - 1293, 2003/10
Times Cited Count：39 Percentile：74(Physics, Fluids & Plasmas)no abstracts in English
Saito, Yuya; Tanai, Kenji; Kikuchi, Hirohito*; Hirai, Takashi*; Nishimura, Mayuka*
no journal, ,
no abstracts in English
Toyoshima, Atsushi; Oe, Kazuhiro; Li, Z.*; Asai, Masato; Sato, Nozomi; Sato, Tetsuya; Kikuchi, Takahiro; Kaneya, Yusuke*; Kitatsuji, Yoshihiro; Tsukada, Kazuaki; et al.
no journal, ,
Electrochemical study of mendelevium (Md) with flow electrolytic column chromatography is presented. The 
Md isotope was produced in the 
Cm(
B, 4
) reaction at the JAEA tandem accelerator. In applying a negative voltage on the column electrode, Md was eluted with 0.1 M HCl. This behavior is quite similar to that of Sr
and Eu, clearly indicating that most stable Md
is reduced to Md
. We determined the redox potential of Md to be approximately -0.18 V versus a standard hydrogen electrode.
Toyoshima, Atsushi; Li, Z.*; Asai, Masato; Sato, Nozomi; Sato, Tetsuya; Oe, Kazuhiro; Kikuchi, Takahiro; Kaneya, Yusuke*; Kitatsuji, Yoshihiro; Tsukada, Kazuaki; et al.
no journal, ,
Redox potential of mendelevium (Md) was determined with flow electrolytic chromatography. Mendelevium-255 with a half-life of 27 min was produced in the Cm(B, 4) reaction at the JAEA tandem accelerator. Reaction products transported by a KCl/He gas-jet method were collected on a chemistry apparatus. After removing KCl with HDEHP column chromatography, elution behavior of Md in 0.10 M HCl was investigated with a flow electrolytic column apparatus at the applied potentials between -0.3 and -0.6 V vs. a Ag/AgCl reference electrode. At -0.3 V, elution behavior of Md was the same as that of 
Bk, showing that the stable Md was not reduced to the divalent state. At -0.6 V, elution of Md was quite similar to that of Sr, demonstrating that Md was successfully reduced to Md. From the behavior of Md against the applied potentials, we evaluated its redox potential to be -0.40
0.03 V.
Toyoshima, Atsushi; Li, Z.*; Asai, Masato; Sato, Tetsuya; Kikuchi, Takahiro*; Kaneya, Yusuke*; Kitatsuji, Yoshihiro; Tsukada, Kazuaki; Nagame, Yuichiro; Sch
del, M.; et al.
no journal, ,
The redox behavior of mendelevium (Md) was studied with flow electrolytic chromatography. The Md isotope produced in the Cm(B, 4n)Md reaction at the JAEA tandem accelerator was used in the electrolytic reduction experiment with the flow electrolytic column apparatus in 0.1 M HCl. It was clearly observed that, applying appropriate potentials on the chromatography column, the most stable Md is reduced to Md. The redox potential of the Md = Md + e
couple was determined to be -0.16 0.05 V vs. a normal hydrogen electrode.
Schdel, M.; Toyoshima, Atsushi; Li, Z.*; Asai, Masato; Sato, Nozomi; Kikuchi, Takahiro; Kaneya, Yusuke; Kitatsuji, Yoshihiro; Tsukada, Kazuaki; Nagame, Yuichiro; et al.
no journal, ,
Nakamura, Shinichi*; Suzui, Nobuo; Kikuchi, Yuka*; Sasaki, Aya*; Ishii, Satomi; Yin, Y.-G.; Kawachi, Naoki; Rai, Hiroki*; Hattori, Hiroyuki*; Fujimaki, Shu
no journal, ,
no abstracts in English
Nakamura, Shinichi*; Suzui, Nobuo; Kikuchi, Yuka*; Shibata, Seiko*; Ishii, Satomi; Yin, Y.-G.; Kawachi, Naoki; Rai, Hiroki*; Hattori, Hiroyuki*; Fujimaki, Shu
no journal, ,
no abstracts in English
