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Journal Articles

Emergent spin-1 Haldane gap and ferroelectricity in a frustrated spin-$$frac{1}{2}$$ ladder

Ueda, Hiroshi*; Onoda, Shigeki*; Yamaguchi, Yasuhiro*; Kimura, Tsuyoshi*; Yoshizawa, Daichi*; Morioka, Toshiaki*; Hagiwara, Masayuki*; Hagiwara, Masato*; Soda, Minoru*; Masuda, Takatsugu*; et al.

Physical Review B, 101(14), p.140408_1 - 140408_6, 2020/04

 Times Cited Count:2 Percentile:44.66(Materials Science, Multidisciplinary)

JAEA Reports

Hydrochemical investigation at the Mizunami Underground Research Laboratory; Compilation of groundwater chemistry in the Mizunami group and Toki granite area (April, 2004 - March, 2008)

Sai, Masataka; Hagiwara, Hiroki; Matsushima, Hiroyuki*; Noda, Masatoshi*; Noda, Masaru*; Ando, Kenichi*; Tanaka, Tatsuya*; Ueda, Tadashi*; Honda, Yuko*; Mizuno, Takashi

JAEA-Data/Code 2010-010, 75 Pages, 2010/09

JAEA-Data-Code-2010-010.pdf:2.5MB

This report compiles data set of the groundwater chemistry obtained at Mizunami Underground Research Laboratory (MIU) between the fiscal year 2004 and the fiscal year 2007. These data includes groundwater chemistry of inflow in the shafts and sampled groundwater in the boreholes, which drilled from sub-stages of MIU and from surface (MSB-2, MSB-4, and MIZ-1). Basic information (e.g. sampling location, sampling date, sampling method, analytical method) are also described in terms of quality control and traceability.

Journal Articles

Sorption distribution coefficients of selenium on a sandy mudstone under reducing conditions of underground

Iida, Yoshihisa; Kimura, Yuichiro*; Yamaguchi, Tetsuji; Ueda, Masato*; Tanaka, Tadao; Nakayama, Shinichi

Genshiryoku Bakkuendo Kenkyu, 15(2), p.57 - 67, 2009/03

Sorption of radionuclides on rocks is an important factor for safety assessments of geologic disposal of radioactive wastes. Batch sorption tests were conducted to investigate effects of concentrations of NaNO$$_{3}$$ and NaCl on sorption distribution coefficients(Kd) of selenium(Se) on a sandy mudstone under reducing environment of underground. The rock and groundwater used in the tests were sampled from depths of 129-156 m with special care minimizing contact with air. Se was spiked as HSe$$^{-}$$ or Se$$_{4}$$$$^{2-}$$ to the test solutions and kept as HSe$$^{-}$$ throughout the test periods by keeping reducing conditions (Eh, pH) of the solutions. Obtained Kd values were in a range of 0.015-0.037 m$$^{3}$$ kg$$^{-1}$$, which were as high as those for a typical sorbing element, Cs.

Journal Articles

Report on ITPA meetings, 24

Idomura, Yasuhiro; Yoshida, Maiko; Yagi, Masatoshi*; Tanaka, Kenji*; Hayashi, Nobuhiko; Sakamoto, Yoshiteru; Tamura, Naoki*; Oyama, Naoyuki; Urano, Hajime; Aiba, Nobuyuki; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 84(12), p.952 - 955, 2008/12

no abstracts in English

Journal Articles

Research and development of nuclear fusion

Ushigusa, Kenkichi; Seki, Masahiro; Ninomiya, Hiromasa; Norimatsu, Takayoshi*; Kamada, Yutaka; Mori, Masahiro; Okuno, Kiyoshi; Shibanuma, Kiyoshi; Inoue, Takashi; Sakamoto, Keishi; et al.

Genshiryoku Handobukku, p.906 - 1029, 2007/11

no abstracts in English

Journal Articles

Pressure effect of electrical resistivity and AC specific heat in CePtAl

Nakashima, Miho*; Ueda, Taiki*; Shimizu, Katsuya*; Nakashima, Hiroshi*; Thamizhavel, A.*; Tateiwa, Naoyuki; Haga, Yoshinori; Hedo, Masato*; Uwatoko, Yoshiya*; Settai, Rikio*; et al.

Journal of Magnetism and Magnetic Materials, 310(2, Part1), p.e9 - e11, 2007/03

We measured the electrical resistivity and AC-specific heat for a canted ferromagnet CePtAl under pressures using a diamond-anvilpressure cell. With increasing pressure, the magnetic ordering temperature $$T_{rm C1}$$ increases monotonously, becomes constant above 8 GPa and then starts to decrease steeply in a narrow pressure region from 10.3 to 10.9 GPa, indicating the first-order like phase transition. The similar pressure dependence of $$T_{rm C1}$$ was obtained in the AC-specific heat measurement.

Journal Articles

Extraction of groundwater humic substances and characterization by synthetic resin

Ueda, Masato; Sakamoto, Yoshiaki*

Genshiryoku Bakkuendo Kenkyu, 12(1-2), p.31 - 39, 2006/03

no abstracts in English

Journal Articles

Interlock systems for J-PARC LINAC

Sakaki, Hironao; Takahashi, Hiroki; Ishiyama, Tatsuya*; Kawase, Masato; Sako, Hiroyuki; Kato, Yuko; Ito, Yuichi; Yoshikawa, Hiroshi; Ueda, Shinji*; Suzuki, Takahiro*

Proceedings of 3rd Annual Meeting of Particle Accelerator Society of Japan and 31st Linear Accelerator Meeting in Japan (CD-ROM), p.367 - 369, 2006/00

This paper reports Personnel Interlock System, Machine Protection System, and other Interlock System in J-PARC LINAC. The noise measures is important in MPS, we describe the noise decreasing method. The number of accelerating particles in J-PARC LINAC that can be accelerated has been deciding by ministry's guideline. Therefore, it is necessary to do severe surveillance. Here we also explain this particle monitoring instrument.

Journal Articles

Construction of GUI for J-PARC LINAC machine protection system

Ishiyama, Tatsuya*; Yoshikawa, Hiroshi; Sakaki, Hironao; Sako, Hiroyuki; Takahashi, Hiroki; Ito, Yuichi; Kato, Yuko; Kawase, Masato; Ueda, Shinji*; Sugimoto, Makoto*; et al.

Proceedings of 3rd Annual Meeting of Particle Accelerator Society of Japan and 31st Linear Accelerator Meeting in Japan (CD-ROM), p.370 - 372, 2006/00

no abstracts in English

Journal Articles

Effect of pressure on electronic states in canted ferromagnet CePtAl

Ueda, Taiki*; Nakashima, Miho*; Hedo, Masato*; Uwatoko, Yoshiya*; Nakashima, Hiroshi*; Thamizhavel, A.*; Matsuda, Tatsuma; Haga, Yoshinori; Settai, Rikio*; Onuki, Yoshichika

Journal of the Physical Society of Japan, 74(12), p.3393 - 3394, 2005/12

 Times Cited Count:6 Percentile:42.78(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Experimental study on long-term safety assessment considering uncertainties for geological disposal of radioactive wastes; JAERI status at 2005

Yamaguchi, Tetsuji; Sakamoto, Yoshifumi; Iida, Yoshihisa; Negishi, Kumi; Taki, Hiroshi; Akai, Masanobu; Jinno, Fumika; Kimura, Yuichiro; Ueda, Masato; Tanaka, Tadao; et al.

Proceedings of International Conference on Nuclear Energy System for Future Generation and Global Sustainability (GLOBAL 2005) (CD-ROM), 6 Pages, 2005/10

no abstracts in English

Journal Articles

Single crystal growth and fermi surface properties of an antiferromagnet UPdGa$$_5$$

Ikeda, Shugo; Matsuda, Tatsuma; Haga, Yoshinori; Yamamoto, Etsuji; Nakashima, Miho*; Kirita, Shingo*; Kobayashi, Tatsuo*; Hedo, Masato*; Uwatoko, Yoshiya*; Yamagami, Hiroshi*; et al.

Journal of the Physical Society of Japan, 74(8), p.2277 - 2281, 2005/08

 Times Cited Count:10 Percentile:54.78(Physics, Multidisciplinary)

We have succeeded in growing a high-quality single crystal of an antiferromagnet UPdGa$$_5$$ by the Ga-flux method with the off-stoichiometric composition of U : Pd : Ga = 1 : 2 : 7.3. The electronic state has been investigated by the de Haas-van Alphen experiment, indicating the similar cylindrical Fermi surfaces as in an antiferromagnet UPtGa$$_5$$. We have also studied the pressure effect by measuring the electrical resistivity. The N$$acute{rm e}$$el temperature decreases with increasing pressure and becomes zero at 3.1 GPa. The antiferromagnetic state is changed into the paramagnetic state above 3.1 GPa.

Journal Articles

Influences of humid substances, alkaline conditions and colloids on radionuclide migration in natural barrier

Mukai, Masayuki; Ueda, Masato; Inada, Daisuke; Yukawa, Kazuhiko; Maeda, Toshikatsu; Iida, Yoshihisa

Proceedings of International Symposium NUCEF 2005, p.219 - 224, 2005/08

For better quantitative understanding of radionuclide migration for safety assessment of geologic disposal, JAERI has been conducting experimental and modeling studies on influences of humic substances, highly alkaline conditions and colloids on sorptive and diffusional behavior of TRU in geologic materials. In the absence of fulvic acid, one of humic substances, diffusion of Am through a tuff sample was not detected. By adding fulvic acid, Am was detected in the downstream cell, which indicates the diffusion through the sample. Highly alkaline conditions arisen from cementitious materials may spread by altering chemical and physical properties of geologic materials. Through-diffusion experiments of alkaline species in granite showed that the effective diffusion coefficient of Ca$$^{2+}$$ and OH$$^{-}$$ in a cement-equilibrated aqueous solution were found to be higher by almost two orders of magnitude than Na$$^{+}$$ and OH$$^{-}$$ in a NaOH solution. Radionuclide migration can be enhanced by colloids, and thus a calculation code describing the effect of colloids on radionuclide migration has been required.

Journal Articles

Present research status on divertor and plasma facing components for fusion power plants

Suzuki, Satoshi; Ueda, Yoshio*; Tokunaga, Kazutoshi*; Sato, Kazuyoshi; Akiba, Masato

Fusion Science and Technology, 44(1), p.41 - 48, 2003/07

 Times Cited Count:22 Percentile:81.33(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Performance of a very high resolution soft X-ray beamline BL25SU with a twin-helical undulator at SPring-8

Saito, Yuji; Kimura, Hiroaki*; Suzuki, Yoshio*; Nakatani, Takeshi*; Matsushita, Tomohiro*; Muro, Takayuki*; Miyahara, Tsuneaki*; Fujisawa, M.*; Soda, Kazuo*; Ueda, Shigenori*; et al.

Review of Scientific Instruments, 71(9), p.3254 - 3259, 2000/09

 Times Cited Count:179 Percentile:99.03(Instruments & Instrumentation)

no abstracts in English

Oral presentation

Determination of distribution coefficients on rocks under maintained reducing conditions of underground, 1; Considerations on reducing conditions of underground

Yamaguchi, Tetsuji; Kimura, Yuichiro; Iida, Yoshihisa; Tanaka, Tadao; Nakayama, Shinichi; Ueda, Masato*; Araki, Kunio*

no journal, , 

no abstracts in English

Oral presentation

Determination of distribution coefficients on rocks under maintained reducing conditions of underground, 2; Consideration on conditions of sorption tests

Kimura, Yuichiro; Yamaguchi, Tetsuji; Iida, Yoshihisa; Tanaka, Tadao; Nakayama, Shinichi; Ueda, Masato*; Araki, Kunio*

no journal, , 

no abstracts in English

Oral presentation

Experimental research for long term evaluation on radioactive waste disposal; Progress in 2006

Tanaka, Tadao; Yamaguchi, Tetsuji; Iida, Yoshihisa; Kimura, Yuichiro; Taki, Hiroshi; Fujiwara, Takeshi; Ueda, Masato*; Mukai, Masayuki; Yamada, Fumika; Mizuno, Tsuyoshi; et al.

no journal, , 

no abstracts in English

Oral presentation

Current status of the component failure rates evaluation work based on the reprocessing plant maintenance data

Ishida, Michihiko; Suto, Toshiyuki; Inano, Masatoshi; Aoshima, Atsushi; Muramatsu, Ken; Ueda, Yoshinori*

no journal, , 

A study to evaluate component failure rates for a reprocessing plant has started at the Japan Atomic Energy Agency (JAEA). The study is sponsored by the Japan Nuclear Energy Safety Organization (JNES) as a contract research. The Tokai Reprocessing plant(TRP) has been operating over 30 years since 1977. Maintenance records of plant components have been accumulated and compiled in the Tokai Reprocessing Plant Maintenance Support System (TORMASS). Since the TORMASS was thought to be an effective source to pick up component failure information, the evaluation work of component failure rates started at 2005 based on the maintenance records in the TORMASS. By the end of 2006, failure rates for 17 types of 392 components had been evaluated. This result is expected to contribute to building up generic database for reprocessing plant component failure rates in order to promote the utilization of the risk information for reprocessing plants in Japan.

Oral presentation

Preparation of equipment failure rate for a reprocessing facility, 2; Calculation of equipment failure rates based on the actual plant data

Ishida, Michihiko; Inano, Masatoshi; Aoshima, Atsushi; Suto, Toshiyuki; Muramatsu, Ken; Ueda, Yoshinori*

no journal, , 

Component failure rates are one of the most important inputs for PSA. Although there are many component failure rates databases for NPPs, there are few for a reprocessing plant. Therefore, in order to perform reliable PSA of a reprocessing plant, it is important to establish the failure rate database based on the actual plant maintenance data. The Tokai Reprocessing Plant (TRP) has been operating over 30 years since 1977. Maintenance records of plant components have been accumulated and compiled in the Tokai Reprocessing Plant Maintenance Support System (TORMASS). A basic study has started in the JAEA from 2005 by using the TORMASS data to contribute the development of reliable component failure rates. The outlines of the component failure estimation are summarized.

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