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JAEA Reports

Hydrochemical investigation at the Mizunami Underground Research Laboratory; Compilation of groundwater chemistry data in the Mizunami group and the Toki granite (fiscal year 2016)

Watanabe, Yusuke; Hayashida, Kazuki; Kato, Toshihiro; Kubota, Mitsuru; Aosai, Daisuke*; Kumamoto, Yoshiharu*; Iwatsuki, Teruki

JAEA-Data/Code 2018-002, 108 Pages, 2018/03

JAEA-Data-Code-2018-002.pdf:6.53MB

Japan Atomic Energy Agency has been investigating groundwater chemistry to understand the effect of excavation and maintenance of underground facilities as part of the Mizunami Underground Research Laboratory (MIU) Project in Mizunami, Gifu, Japan. In this report, we compiled data of groundwater chemistry and microbiology obtained at the MIU in the fiscal year 2016 and 2014 to 2016, respectively. In terms of ensuring traceability of data, basic information (e.g. sampling location, sampling time, sampling method and analytical method) and methodology for quality control are described.

JAEA Reports

Conceptual design of multipurpose compact research reactor; Annual report FY2010 (Joint research)

Imaizumi, Tomomi; Miyauchi, Masaru; Ito, Masayasu; Watahiki, Shunsuke; Nagata, Hiroshi; Hanakawa, Hiroki; Naka, Michihiro; Kawamata, Kazuo; Yamaura, Takayuki; Ide, Hiroshi; et al.

JAEA-Technology 2011-031, 123 Pages, 2012/01

JAEA-Technology-2011-031.pdf:16.08MB

The number of research reactors in the world is decreasing because of their aging. However, the planning to introduce the nuclear power plants is increasing in Asian countries. In these Asian countries, the key issue is the human resource development for operation and management of nuclear power plants after constructed them, and also the necessity of research reactor, which is used for lifetime extension of LWRs, progress of the science and technology, expansion of industry use, human resources training and so on, is increasing. From above backgrounds, the Neutron Irradiation and Testing Reactor Center began to discuss basic concept of a multipurpose low-power research reactor for education and training, etc. This design study is expected to contribute not only to design tool improvement and human resources development in the Neutron Irradiation and Testing Reactor Center but also to maintain and upgrade the technology on research reactors in nuclear power-related companies. This report treats the activities of the working group from July 2010 to June 2011 on the multipurpose low-power research reactor in the Neutron Irradiation and Testing Reactor Center and nuclear power-related companies.

Journal Articles

Analysis of $$n$$ + $$^6$$Li reactions using the continuum-discretized coupled-channels method

Ichinkhorloo, D.*; Matsumoto, Takuma*; Hirabayashi, Yoshiharu*; Kato, Kiyoshi*; Chiba, Satoshi

Journal of Nuclear Science and Technology, 48(11), p.1357 - 1360, 2011/10

 Times Cited Count:6 Percentile:44.45(Nuclear Science & Technology)

The $$n$$ + $$^6$$Li reactions are important not only from the basic interest of the system but also from the application point of view. In this work, we study $$^6$$Li breakup reactions of incident neutron energies 11.5, 14.1 and 18.0 MeV by applying an $$alpha$$ + $$d$$ cluster model to $$^{6}$$Li and using the continuum-discretized coupled-channels approach. At the present energy, our calculation gives almost good agreement with experimental data.

Journal Articles

Systematic description of the $$^6$$Li($$n,n'$$)$$^6$$Li$$^* to d+ alpha$$ reactions with the microscopic coupled-channels method

Matsumoto, Takuma*; Ichinkhorloo, D.*; Hirabayashi, Yoshiharu*; Kato, Kiyoshi*; Chiba, Satoshi

Physical Review C, 83(6), p.064611_1 - 064611_6, 2011/06

 Times Cited Count:21 Percentile:75.65(Physics, Nuclear)

We investigate $$^6$$Li($$n,n'$$)$$^6$$Li$$^* to d + alpha$$ reactions by using the continuum-discretized coupled-channels method with the complex Jeukenne-Lejeune-Mahaux effective nucleon-nucleon interaction. In this study, the $$^6$$Li nucleus is described by a d + $$alpha$$ cluster model. The calculated elastic cross sections for incident energies between 7.47 and 24.0 MeV are in good agreement with experimental data. Furthermore, we show that the neutron spectra for $$^6$$Li breakup states measured at selected angular points and incident energies can be also reproduced systematically.

Journal Articles

Recent progress in the energy recovery linac project in Japan

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.

JAEA Reports

Renewal plan of the JMTR Hot Laboratory for the Irradiation test of high burn-up fuels in FY2007

Sozawa, Shizuo; Nakagawa, Tetsuya; Omi, Masao; Hayashi, Koji; Iwamatsu, Shigemi; Kawamata, Kazuo; Kato, Yoshiaki; Kanazawa, Yoshiharu

JAEA-Technology 2009-069, 32 Pages, 2010/03

JAEA-Technology-2009-069.pdf:7.33MB

Refurbishment of the Japan Materials Testing Reactor (JMTR), which is recognized as one of important facilities in Japan for safety research, is in progress by the JAEA. In Extensive safety research of light-water reactor (LWR) fuels and materials under a contract with the Nuclear and Industrial Safety Agency of Ministry of Economy, Trade and Industry of Japan, the irradiation tests are planned in order to examine integrity of the LWR fuels and structure materials. For the irradiation tests of high burnup fuels and irradiated materials in the JMTR, modification of the hot laboratory facilities are needed, which are (1) strengthening JMTR hot-lab. cell-shielding, (2) the capsule assembling device, (3) domestic transportation cask, (4) fuel-rod center-hole processing device, (5) master-slave manipulators, (6) power manipulator, and (7) scanning electron microscope.

Journal Articles

Solubility of Pu and rare-earths in LiCl-Li$$_{2}$$O melt

Kato, Tetsuya*; Sakamura, Yoshiharu*; Iwai, Takashi; Arai, Yasuo

Radiochimica Acta, 97(4-5), p.183 - 186, 2009/05

 Times Cited Count:4 Percentile:30.6(Chemistry, Inorganic & Nuclear)

The solubility of Pu and rare-earths were measured in LiCl-Li$$_{2}$$O melt where the sesquioxides were precipitated. As shown in the solubility measurement of Pu(III), Nd(III) and Gd(III) at 923 K, the solubility increased proportionally with Li$$_{2}$$O concentration in the melt. It was also found that the element of larger ionic radius has higher solubility as far as the trivalent rare-earths and Pu.

Journal Articles

Real-time observation of initial thermal oxidation on Si(110)-16$$times$$2 surfaces by O 1s photoemission spectroscopy using synchrotron radiation

Suemitsu, Maki*; Kato, Atsushi*; Togashi, Hideaki*; Konno, Atsushi*; Yamamoto, Yoshihisa*; Teraoka, Yuden; Yoshigoe, Akitaka; Narita, Yuzuru*; Enta, Yoshiharu*

Japanese Journal of Applied Physics, Part 1, 46(4B), p.1888 - 1890, 2007/04

 Times Cited Count:12 Percentile:44.55(Physics, Applied)

Initial oxidation of Si(110) surface has been investigated by using real-time X-ray photoemission spectroscopy. The time evolution of the O 1s spectrum shows occurrence of rapid oxidation just after the introduction of the oxygen molecules, which is evidenced by the considerable peak intensity corresponding to oxygen exposure of as low as 1.5L (1L=1.33$$times$$10$$^{-4}$$ Pa s). This initial oxide is dominated by a state with a relatively low binding energy, which is gradually replaced by a state with a relatively high binding energy with the increase of the oxygen exposure, resulting in the low-KE shift of the O 1s peak. Comparison with previously reported O 1s spectra from dry-oxidized Si(111) surface suggests oxidation at or around the adatoms of Si(110)-16$$times$$2 clean surface as a likely oxidation state for this low-binding-energy peak.

Journal Articles

Real-time observation of initial thermal oxidation on Si(110)-16$$times$$2 surface by photoemission spectroscopy

Suemitsu, Maki*; Kato, Atsushi*; Togashi, Hideaki*; Konno, Atsushi*; Yamamoto, Yoshihisa*; Teraoka, Yuden; Yoshigoe, Akitaka; Enta, Yoshiharu*; Narita, Yuzuru*

ECS Transactions, 3(2), p.311 - 316, 2006/00

Initial thermal oxidation of Si(110) surface has been investigated by using real-time X-ray photoemission spectroscopy with synchrotron radiation. The Si(110) initial oxidation is characterized by presence of a rapid oxidation just after the introduction of gaseous oxygen molecules. Peak separation of the O1s photoemission spectra suggests the presence of at least two distinct oxidation sites on the surface, which may reflect the complicated surface structure of the Si(110)-16$$times$$2 reconstruction.

Journal Articles

Development of the simplified MOX pellet fabrication process (short process); Improvement of MOX powder lowability

Makino, Takayoshi; Okita, Takatoshi; Kato, Yoshiyuki; Kurita, Tsutomu; Takahashi, Yoshiharu; Aono, Shigenori

Proceedings of International Conference on Nuclear Energy System for Future Generation and Global Sustainability (GLOBAL 2005) (CD-ROM), 5 Pages, 2005/10

A simplified MOX pellet fabrication process, called short process, has been developed to drastically reduce fuel fabrication cost.The MH powder has characteristic of fine particle and low flowability. It is difficult to pelletize the MH powder directly without granulation into smaller size FR pellet compared with LWR fuel. Therefore, small-scale hot tests to improve the flowability of the MH powder has been carried out using two kinds of methods, and quality of the pellet was evaluated.

Journal Articles

Luminescence study on preferential solvation of europium (III) in water/non-aqueous solvent mixtres

Kimura, Takaumi; Nagaishi, Ryuji; Kato, Yoshiharu; Yoshida, Zenko

Journal of Alloys and Compounds, 323-324(1-4), p.164 - 168, 2001/07

 Times Cited Count:50 Percentile:87.72(Chemistry, Physical)

no abstracts in English

Journal Articles

Luminescence study on solvation of americium(III), curium(III) and several lanthanide(III) ions in nonaqueous and binary mixed solvents

Kimura, Takaumi; Nagaishi, Ryuji; Kato, Yoshiharu; Yoshida, Zenko

Radiochimica Acta, 89(3), p.125 - 130, 2001/05

 Times Cited Count:66 Percentile:96.82(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Speciation of europium(III) sorbed on a montmorillonite surface in the presence of polycarboxylic acid by laser-induced fluorescence spectroscopy

Takahashi, Yoshio*; Kimura, Takaumi; Kato, Yoshiharu; Minai, Yoshitaka*

Environmental Science & Technology, 33(22), p.4016 - 4021, 1999/00

 Times Cited Count:46 Percentile:74.52(Engineering, Environmental)

no abstracts in English

Journal Articles

Laser-induced fluorescence study on the interaction of Eu(III) with polycarboxylates

Takahashi, Yoshio*; Kimura, Takaumi; Kato, Yoshiharu; *; *; *

Journal of Radioanalytical and Nuclear Chemistry, 239(2), p.335 - 340, 1999/00

 Times Cited Count:15 Percentile:72.32(Chemistry, Analytical)

no abstracts in English

Journal Articles

Determination of the hydration number of actinides(III) and lanthanides(III) by luminescence lifetime measurement and its application to the speciation study

Kimura, Takaumi; Kato, Yoshiharu; Takeishi, Hideyo; Takahashi, Yoshio*; Minai, Yoshitaka*; Choppin, G. R.*

Proceedings of OECD/NEA Workshop on Evaluation of Speciation Technology, p.61 - 81, 1999/00

no abstracts in English

Journal Articles

Chemometric and computer-intensive techniques for speciation

Meinrath, G.; Kimura, Takaumi; Kato, Yoshiharu; Yoshida, Zenko; Lis, S.*

Proceedings of OECD/NEA Workshop on Evaluation of Speciation Technology, p.347 - 354, 1999/00

no abstracts in English

Journal Articles

Comparative analysis of actinide(VI) carbonate complexation by Monte Carlo resampling methods

G.Meinrath*; Kato, Yoshiharu; Kimura, Takaumi; Yoshida, Zenko

Radiochimica Acta, 84(1), p.21 - 29, 1999/00

no abstracts in English

Journal Articles

Luminescence study on hydration states of lanthanide(III); polyaminopolycarboxylate complexes in aqueous solution

Kimura, Takaumi; Kato, Yoshiharu

Journal of Alloys and Compounds, 275-277, p.806 - 810, 1998/00

 Times Cited Count:109 Percentile:96.68(Chemistry, Physical)

no abstracts in English

Journal Articles

Luminescence study on the inner-sphere hydration number of lanthanide(III) ions in concentrated aqueous salt solutions in fluid and frozen states

Kimura, Takaumi; Kato, Yoshiharu

Journal of Alloys and Compounds, 278, p.92 - 97, 1998/00

 Times Cited Count:67 Percentile:92.76(Chemistry, Physical)

no abstracts in English

Journal Articles

Comparative study on the hydration states of Cm(III) and Eu(III) in solution and in cation exchange resin

Kimura, Takaumi; Kato, Yoshiharu; Takeishi, Hideyo; G.R.Choppin*

Journal of Alloys and Compounds, 271-273, p.719 - 722, 1998/00

 Times Cited Count:46 Percentile:88.98(Chemistry, Physical)

no abstracts in English

34 (Records 1-20 displayed on this page)