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Suzuki, Yohei*; Mukai, Hiroki*; Ishimura, Toyoho*; Yokoyama, Takatomi*; Sakata, Shuhei*; Hirata, Takafumi*; Iwatsuki, Teruki; Mizuno, Takashi
Scientific Reports (Internet), 6, p.22701_1 - 22701_6, 2016/03
Times Cited Count：14 Percentile：49.16(Multidisciplinary Sciences)The stimulation of bacterial activities that convert hexavalent uranium to tetravalent uranium appears to be feasible for cost-effective remediation of contaminated aquifers. However, U(VI) reduction typically results in the precipitation of U(IV) particles less than 5 nanometers in diameter. Here we show that U(IV) nanoparticles of coffinite formed in fracture-filling calcium carbonate in a granitic aquifer. As the microbiologically induced precipitation of calcium carbonate in aquifer systems worldwide is extremely common, we anticipate simultaneous stimulation of microbial activities for precipitation reactions of calcium carbonate and U(IV) nanoparticles, which leads to long-term sequestration of uranium and other radionuclides in contaminated aquifers and deep geological repositories.
Haba, Hiromitsu*; Akiyama, Kazuhiko*; Tsukada, Kazuaki; Asai, Masato; Toyoshima, Atsushi; Yaita, Tsuyoshi; Hirata, Masaru; Sueki, Keisuke*; Nagame, Yuichiro
Bulletin of the Chemical Society of Japan, 82(6), p.698 - 703, 2009/06
Times Cited Count：10 Percentile：39.79(Chemistry, Multidisciplinary)Chloride complexation of the group-4 elements Zr and Hf in 8.0-11.9 M HCl is investigated by Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy to characterize chloro complexes of the transactinide element, rutherfordium (Rf). The complexes of Zr and Hf successively vary with the concentration of HCl from a hydrated complex [M(H
O) 
]
at 8.0 M to a hexachloro complex [MCl
]
at 11.9 M (M = Zr and Hf). The present structural changes of the Zr and Hf complexes well reflect the previously studied anion-exchange behavior of Zr and Hf in HCl. From both the EXAFS and anion-exchange results, we suggest that Rf forms the same complexes as those of Zr and Hf in HCl, and that the complexation strength of the hexachloro complexes of the group-4 elements, [MCl] (M = Zr, Hf, and Rf), is in the sequence of Rf 
Zr Hf.
Yonetani, Yoshiteru*; Maruyama, Yutaka*; Hirata, Fumio*; Kono, Hidetoshi
Journal of Chemical Physics, 128(18), p.185102_1 - 185102_9, 2008/05
Times Cited Count：20 Percentile：57.95(Chemistry, Physical)Nagame, Yuichiro; Tsukada, Kazuaki; Asai, Masato; Toyoshima, Atsushi; Akiyama, Kazuhiko; Ishii, Yasuo; Sato, Tetsuya; Hirata, Masaru; Nishinaka, Ichiro; Ichikawa, Shinichi; et al.
Radiochimica Acta, 93(9-10), p.519 - 526, 2005/00
Times Cited Count：31 Percentile：87.03(Chemistry, Inorganic & Nuclear)no abstracts in English
Haba, Hiromitsu*; Tsukada, Kazuaki; Asai, Masato; Toyoshima, Atsushi; Akiyama, Kazuhiko; Nishinaka, Ichiro; Hirata, Masaru; Yaita, Tsuyoshi; Ichikawa, Shinichi; Nagame, Yuichiro; et al.
Journal of the American Chemical Society, 126(16), p.5219 - 5224, 2004/04
Times Cited Count：44 Percentile：72.46(Chemistry, Multidisciplinary)Fluoride complexation of element 104, rutherfordium (Rf), produced in the 
Cm(
O,5n)
Rf reaction has been studied by anion-exchange chromatography on an atom-at-a-time scale. The anion-exchangechromatographic behavior of Rf was investigated in 1.9-13.9 M hydrofluoric acid together with those of the group-4 elements Zr and Hf produced in the O-induced reactions on Ge and Gd targets, respectively. It was found that the adsorption behavior of Rf on anion-exchange resin is quite different from those of Zr and Hf, suggesting the influence of relativistic effect on the fluoride complexation of Rf.
Nagame, Yuichiro; Haba, Hiromitsu*; Tsukada, Kazuaki; Asai, Masato; Toyoshima, Atsushi; Goto, Shinichi*; Akiyama, Kazuhiko; Kaneko, Tetsuya; Sakama, Minoru*; Hirata, Masaru; et al.
Nuclear Physics A, 734, p.124 - 135, 2004/04
Times Cited Count：11 Percentile：56.87(Physics, Nuclear)no abstracts in English
Nagame, Yuichiro; Haba, Hiromitsu; Tsukada, Kazuaki; Asai, Masato; Akiyama, Kazuhiko; Hirata, Masaru; Nishinaka, Ichiro; Ichikawa, Shinichi; Nakahara, Hiromichi; Goto, Shinichi*; et al.
Czechoslovak Journal of Physics, 53, p.A299 - A304, 2003/00
Times Cited Count：7 Percentile：46.48(Physics, Multidisciplinary)no abstracts in English
solutionsHaba, Hiromitsu; Tsukada, Kazuaki; Asai, Masato; Goto, Shinichi*; Toyoshima, Atsushi; Nishinaka, Ichiro; Akiyama, Kazuhiko; Hirata, Masaru; Ichikawa, Shinichi; Nagame, Yuichiro; et al.
Journal of Nuclear and Radiochemical Sciences, 3(1), p.143 - 146, 2002/06
We have investigated the sorption behavior of element 104 rutherfordium (Rf) on an anion exchange resin from HCl and HNO solutions. In the HCl experiments, the distribution coefficients of Rf increase with an increase of HCl concentration from 7.0 M to 11.5 M, indicating that anionic species such as [Rf(OH)Cl
] or [RfCl] are formed. This sorption behavior of Rf is typical of the group-4 elements Zr and Hf, and is quite different from that of the pseudo-homologue Th. It is also noted that the distribution coefficients decrease in the order Rf, Zr, Hf at 9.0 M HCl, which is consistent with the expected order of ionic radii. On the other hand, Rf appears to behave like Zr and Hf in 8 M HNO not like Pu and Th.
Haba, Hiromitsu; Tsukada, Kazuaki; Asai, Masato; Nishinaka, Ichiro; Sakama, Minoru*; Goto, Shinichi*; Hirata, Masaru; Ichikawa, Shinichi; Nagame, Yuichiro; Kaneko, Tetsuya*; et al.
Radiochimica Acta, 89(11-12), p.733 - 736, 2002/02
Times Cited Count：15 Percentile：68.91(Chemistry, Inorganic & Nuclear)no abstracts in English
Kawai, Maki; Kobayashi, Yasuhiko; Hirata, Aiko*; Ono, Yutaka; Watanabe, Hiroshi; Uchimiya, Hirofumi
Plant Biotechnology, 17(4), p.305 - 308, 2000/12
no abstracts in English
Kukita, Yutaka; Nakamura, Hideo; *; *; *; Anoda, Yoshinari; Kumamaru, Hiroshige; Suzuki, Mitsuhiro; ; Yonomoto, Taisuke; et al.
JAERI-M 91-040, 122 Pages, 1991/03
no abstracts in English
Kukita, Yutaka; *; *; *; Anoda, Yoshinari; Kumamaru, Hiroshige; Suzuki, Mitsuhiro; ; Yamamoto, Nobuo; Nakamura, Hideo; et al.
JAERI-M 90-039, 122 Pages, 1990/03
no abstracts in English
Kukita, Yutaka; *; *; Anoda, Yoshinari; Kumamaru, Hiroshige; Suzuki, Mitsuhiro; ; Yamamoto, Nobuo; Nakamura, Hideo; Yonomoto, Taisuke; et al.
JAERI-M 89-225, 117 Pages, 1990/01
no abstracts in English
Kukita, Yutaka; *; *; Anoda, Yoshinari; Kumamaru, Hiroshige; Suzuki, Mitsuhiro; ; Yamamoto, Nobuo; Nakamura, Hideo; Yonomoto, Taisuke; et al.
JAERI-M 89-220, 127 Pages, 1990/01
no abstracts in English
Kumamaru, Hiroshige; *; Nakamura, Hideo; Kukita, Yutaka; Koizumi, Yasuo; Anoda, Yoshinari; Suzuki, Mitsuhiro; ; Katayama, Jiro; Yamamoto, Nobuo; et al.
JAERI-M 89-027, 105 Pages, 1989/03
no abstracts in English
*; *; *; *; *
PNC TN941 80-153, 46 Pages, 1980/09
This paper discribes the system design of the JOYO reactor containment atmosphere conditioning system and also includes the design which was revised because of the test results not satisfying the design requirement.
*; *; *; *; *; *; *
PNC TN941 80-59VOL2, 164 Pages, 1980/04
PNC-TN941-80-59VOL2.pdf:9.03MB
None
*; *; *; *; *; *; *
PNC TN941 80-59VOL1, 121 Pages, 1980/04
PNC-TN941-80-59VOL1.pdf:6.05MB
During the annual 1979 inspection of the JOYO experimental fast reactor, local leak tests were performed prior to the integrated leak rate test of the containment vessel itself. These tests, performed from the end of August to the beginning of December, were conducted to determine the leakage of the containment penetrations and auxiliary systems. The results of the tests were acceptable. [total leak rate of B test results 7.451
10
2.57110
(%/day)] [total leak rate of C test results 4.023102.77310(%/day)] This document describes the methods, procedures and results of these local leak tests. The results of past test are also described.
*; Enomoto, Toshihiko*; *; *; *; *; *
PNC TN943 80-01, 70 Pages, 1980/03
In December 1979, the integrated leak rate test (ILRT) of the JOYO reactor pressure containment vessel was conducted, as part of the JOYO annual inspection, to confirm the leaktightness of the containment vessel. The test was tbe second ILRT perfomed since initial sodium fill (the first ILRT was carried out in February, 1978). As a result of the test, leak rates of 0.034 0.021 %/day by the absolute pressure method and of 0.0390.006 %/day by the reference chamber method were obtained. These leak rates were almost the same as those obtained in the first test which were 0.0360.011 %/day and 0.036 0.008 %/day, respectively. After combining results from local leak tests and correcting for measuring errors, and the compensated leak rate was found to be well within the leak rate limit of 1.90 %/day which was established by the safety criteria of the containment. These test results demonstrate that the JOYO containment vessel manitains the leaktightness which is required for the functional integrity of the containment in an accidental condition. The successful completion of both the first and second ILRT showed that the test methods and procedures used for leak tests of the JOYO Liquid Metal Fast Reactor are accurate and practical.
Kambara, Toyozo; Uno, Hidero; Shoda, Katsuhiko; Hirata, Yutaka; Shoji, Tsutomu; Kohayakawa, Toru; Takayanagi, Hiroshi; Fujimura, Tsutomu; Morita, Morito; Ichihara, Masahiro; et al.
JAERI 1045, 11 Pages, 1963/03
no abstracts in English
