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Haga, Yoshinori; Matsumoto, Yuji*; Pospisil, J.; Tateiwa, Naoyuki; Yamamoto, Etsuji; Yamamura, Tomoo*; Fisk, Z.*
Journal of Physics; Conference Series, 807(1), p.012015_1 - 012015_4, 2017/04
Times Cited Count：1 Percentile：33.96(Physics, Condensed Matter)
Si as a reference to the strongly correlated isostructural metals investigated by quantum oscillationsMatsumoto, Yuji*; Haga, Yoshinori; Tateiwa, Naoyuki; Aoki, Haruyoshi*; Kimura, Noriaki*; Yamamura, Tomoo*; Yamamoto, Etsuji; Matsuda, Tatsuma*; Fisk, Z.*; Yamagami, Hiroshi*
Journal of the Physical Society of Japan, 85(10), p.104709_1 - 104709_7, 2016/10
Times Cited Count：2 Percentile：20.02(Physics, Multidisciplinary)Matsuno, Jobu*; Ihara, Kota*; Yamamura, Shugen*; Wadachi, Hiroki*; Ishii, Kenji; Shankar, V.*; Kee, H.-Y.*; Takagi, Hidenori*
Physical Review Letters, 114(24), p.247209_1 - 247209_5, 2015/06
Times Cited Count：150 Percentile：97.76(Physics, Multidisciplinary)
Th
Ru
SiHaga, Yoshinori; Matsumoto, Yuji*; Tateiwa, Naoyuki; Yamamoto, Etsuji; Kimura, Noriaki*; Yamamura, Tomoo*; Fisk, Z.
Journal of Physics; Conference Series, 592(1), p.012036_1 - 012036_5, 2015/03
Times Cited Count：2 Percentile：60.63(Physics, Atomic, Molecular & Chemical)Tamai, Hiroshi; Yamamura, Tsukasa; Teraoka, Nobuaki
JAEA-Review 2014-029, 79 Pages, 2014/08
JAEA-Review-2014-029.pdf:43.14MB
In recent circumstance of increasing new comer countries having nuclear power plants, the importance of bilateral nuclear cooperation agreement becomes much higher to ensure the non-proliferation regime in promoting the nuclear cooperation. This paper describes the analysis of nuclear non-proliferation prerequisite, such as safeguards application, transfer restriction of nuclear materials, equipment, and sensitive technology, provided in the cooperation agreements. It is found that every agreement contains the prerequisite to maintain the non-proliferation regime to a level, whereas that there exists some difference between suppliers countries in the regulation on implementing enrichment and reprocessing, storage of plutonium and enriched uranium, and transfer of sensitive technologies. In order to promote the reinforcement of international non-proliferation framework, it will be effective to build up the incentive and common understanding on necessity of non-proliferation.
Yamamura, Tsukasa; Suda, Kazunori; Tomikawa, Hirofumi; Suzuki, Mitsutoshi; Kuno, Yusuke; Mochiji, Toshiro
JAEA-Review 2014-011, 74 Pages, 2014/03
JAEA-Review-2014-011.pdf:6.18MB
The Japan Atomic Energy Agency held "International Forum on Peaceful Use of Nuclear Energy, Nuclear Non-proliferation and Nuclear Security; Ensuring Nuclear Non-Proliferation and Nuclear Security of Nuclear Fuel Cycle Options in consideration of the Accident at TEPCO's Fukushima Daiichi Nuclear Power Station" on 3 and 4 December 2013. Keynote speakers from Japan, the United States, France and International Atomic Energy Agency (IAEA), respectively explained their efforts. In two panel discussions, entitled "Nuclear non-proliferation and nuclear security measures of nuclear fuel cycle options in consideration of the Accident at TEPCO's Fukushima Daiichi Nuclear Power Station" and "Roles of safeguards and technical measures for ensuring nuclear non-proliferation for nuclear fuel cycle options", active discussions were made. This report includes abstracts of keynote speeches, summaries of two panel discussions and materials of the presentations in the forum.
Yamamura, Tsukasa; Suda, Kazunori; Tomikawa, Hirofumi; Takeda, Yu; Teraoka, Nobuaki
JAEA-Review 2014-007, 106 Pages, 2014/03
JAEA-Review-2014-007.pdf:10.11MB
In this report, we research nuclear policy and the past background of non-proliferation issues between Japan and the U.S., especially for the purpose of making contributions for consideration in new negotiations of the Japan-U.S. nuclear agreement, which expires in 2018. In particular, we focus on negotiation of the Tokai Reprocessing Plant and revised Japan-U.S. nuclear agreement of 1988, which made significant strides in the nuclear fuel cycle program, then analyze the effect of U.S. non-proliferation policy on Japan's nuclear fuel cycle policy. The relationship between Japan and the U.S. in nuclear cooperation has evolved from a one-sided relationship, in which the U.S. influenced Japan in the selection of nuclear material and equipment transferred to Japan, to a more reciprocal relationship. As a result of this, Japan could incorporate the comprehensive prior consent, which was the framework enforcing the nuclear fuel cycle into the agreement without being swayed by the U.S. Administration. However, we need continued and careful observation of evolving nuclear policies in the U.S. Administration and Congress, because a substantial percentage of Japan's nuclear material is of U.S. origin.
Tazaki, Makiko; Yamamura, Tsukasa; Suzuki, Mitsutoshi; Kuno, Yusuke; Mochiji, Toshiro
JAEA-Review 2013-001, 76 Pages, 2013/03
JAEA-Review-2013-001.pdf:8.59MB
The Japan Atomic Energy Agency held "International Forum on Nuclear Energy, Nuclear Non-proliferation and Nuclear Security; Measures to ensure nuclear non-proliferation and nuclear security for the back end of nuclear fuel cycle and regional cooperation in Asia" on 12 and 13 December 2012. In the forum, 5 keynote speakers respectively explained their views and efforts regarding challenges for peaceful use of nuclear energy and nuclear non-proliferation. In two panel discussions, entitled "Measures to ensure nuclear non-proliferation and nuclear security of nuclear fuel cycle back end" and "Measures to ensure nuclear non-proliferation and nuclear security for nuclear energy use in the Asian region and a multilateral cooperative framework", active discussions were initiated among panelists. This report includes abstracts of keynote speeches, summaries of two panel discussions and materials of the presentations in the forum.
Kuno, Yusuke; Suzuki, Mitsutoshi; Yamamura, Tsukasa; Tazaki, Makiko
Nihon Genshiryoku Gakkai-Shi ATOMO
, 55(2), p.111 - 116, 2013/02
This article discusses issues on direct disposal of spent fuel and recovered plutonium from reprocessing, and described the international communities' concerns at Japanese nuclear policy change. Some options to be studied for SF and plutonium handling are also discussed.
Shimizu, Ryo; Suzuki, Mitsutoshi; Sakurai, Satoshi; Tamai, Hiroshi; Yamamura, Tsukasa; Naoi, Yosuke; Kuno, Yusuke
JAEA-Review 2011-038, 116 Pages, 2012/02
JAEA-Review-2011-038.pdf:21.45MB
International forum on peaceful use of nuclear energy and nuclear non-proliferation was held at Gakushi-kaikan, Tokyo on February 2-3, 2011 in cooperation with The Japan Institute of International Affairs (JIIA) and The University of Tokyo Global COE. In our International Forum, we would like to encourage active discussion of international challenges to and solutions for compatibility between peaceful use of nuclear energy and nuclear non-proliferation, and international cooperation for emerging nuclear energy states. It was successfully carried out with as many as 310 participants and a lot of discussions. This report includes abstracts of keynote speeches, summary of panel discussions and materials of the presentations in the forum.
Osaka, Masahiko; Konashi, Kenji*; Hayashi, Hirokazu; Li, D.*; Homma, Yoshiya*; Yamamura, Tomoo*; Sato, Isamu; Miwa, Shuhei; Sekimoto, Shun*; Kubota, Takumi*; et al.
Proceedings of International Conference on Toward and Over the Fukushima Daiichi Accident (GLOBAL 2011) (CD-ROM), 5 Pages, 2011/12
Summer schools for future experts have successfully been completed under Japan Actinide Network (J-ACTINET) for the purpose of development of human resources who are expected to be engaged in every areas of actinide-research/engineering. The first summer school was held in Ibaraki-area in August 2009, followed by the second one in Kansai-area in August 2010. Two summer schools have focused on actual experiences of actinides in actinide-research fields for university students and young researchers/engineers as an introductory course of actinide-researches. Several quasi actinide-handling experiences at the actinide-research fields have attracted attentions of participants at the first school in Ibaraki-area. The actual experiments using actinides-containing solutions have been carried out at the second school in Kansai-area. Future summer schools will be held every year for the sustainable human resource development in various actinide-research fields.
Inagaki, Yaohiro*; Sakatani, Keiichi*; Yamamura, Yuki*; Mitsui, Seiichiro; Noshita, Kenji*; Miura, Yoshiyuki*; Kanehira, Norio*; Ochi, Eiji*; Mukunoki, Atsushi*; Chiba, Tamotsu*
Dai-7-Kai Saishori, Risaikuru Bukai Semina Tekisuto, p.136 - 137, 2011/01
Conventional static test methods are not appropriate to evaluate glass dissolution behavior at an arbitrarily-fixed condition due to compositional change of the solution with glass dissolution. In this study, we applied a newly-devised micro-channel flow-through test method to measurement of the initial dissolution rates of Japanese simulated waste glasses, JAEA-P0798 and JNFL-KMOC, at arbitrarily-fixed conditions and we evaluated temperature and pH dependence of glass dissolution. The results showed that the initial dissolution rate increased with temperature and had "V-shaped" pH dependence at each temperature.
Yamamura, Tsukasa; Matsushima, Hideya; Otsuka, Naoto*; Tazaki, Makiko; Mizuma, Hideki*; Kadota, Koshu*; Kimoto, Toru
JAEA-Review 2010-040, 180 Pages, 2010/09
JAEA-Review-2010-040.pdf:4.84MB
Japan initiated a program of peaceful use of nuclear energy in 1950s. Since that time, Japan has made it clear that the program is carried out strictly for peaceful purposes in a transparent manner, implementing measures to win trust from international community. In this report, we review, analyze and evaluate Japan's efforts to ensure nuclear non-proliferation, deviding them into seven categories. Through such review, analysis and evaluation, the significant elements in terms of wining the trust for the peaceful nature of the nuclear energy use and future challenges have been identified for each category stated above. We expect this report to contribute to the discussion on the policy of peaceful use of nuclear energy and nuclear non-proliferation within the Atomic Energy Commission of Japan and to be any use for the states which plan to initiate nuclear energy use program on a significant scale including the deployment of nuclear power plants.
Kuno, Yusuke; Naoi, Yosuke; Yamamura, Tsukasa
Nihon Genshiryoku Gakkai-Shi ATOMO, 52(6), p.346 - 351, 2010/06
Japan has been promoting the peaceful use of nuclear energy, ensuring compliance with international norms relating to nuclear non-proliferation. Japan has also played a role for the promotion of nuclear disarmament. On the other hand concerns about nuclear proliferation have been raised in the world, the situation threatens the peaceful use of nuclear energy. In the field of peaceful use of nuclear energy and the nuclear non-proliferation (arms) it is becoming increasingly important that Japan leads the world to contribute concretely. It needs to overcome many challenges. This report summerizes the discussion at the International Forum on Peaceful Use of Nuclear Energy and Nuclear Nonproliferation/Nuclear Disarmament to be held in December 2009. Authors report and consider the future challenges as well as efforts against those based on the discussion.
Senzaki, Masao; Yamamura, Tsukasa
Nihon Genshiryoku Gakkai-Shi ATOMO, 51(6), p.458 - 462, 2009/06
no abstracts in English
Kawai, Masayoshi*; Furusaka, Michihiro; Li, J.-F.*; Kawasaki, Akira*; Yamamura, Tsutomu*; Mehmood, M.*; Kurishita, Hiroaki*; Kikuchi, Kenji; Takenaka, Nobuyuki*; Kiyanagi, Yoshiaki*; et al.
Proceedings of ICANS-XVI, Volume 3, p.1087 - 1096, 2003/07
In order to establish the technique fabricating a thin target slab with a real size, thin tantalum-clad tungsten slab with a hole for a thermocouple was fabricated with the high-precision machinery techniques and the HIP'ing method. The ultrasonic diagnostic showed that tantalum and tungsten bond was perfect. The HIP optimum condition was certified by means of the small punch test as already reported. The electrolytic coating technique in a molten salt was developed to make a thinner tantalum cladding on a tungsten target with a complicated shape, in order to reduce radioactivity from tantalum in an irradiated target.
Kawai, Masayoshi*; Furusaka, Michihiro*; Kikuchi, Kenji; Kurishita, Hiroaki*; Watanabe, Ryuzo*; Li, J.*; Sugimoto, Katsuhisa*; Yamamura, Tsutomu*; Hiraoka, Yutaka*; Abe, Katsunori*; et al.
Journal of Nuclear Materials, 318, p.35 - 55, 2003/05
R&D works for MW class solid target composed of tungsten to produce pulsed intense neutron source has been made in order to construct a future scattering facility. Three methods were investigated to prevent corrosion of tungsten from water; those are hipping, brazing and electric coating in molten salt bath. Hipping condition was optimized to be 1500 degree C in the previous work: here small punch test shows highest load for crack initiation of hipped materials at the boundary of W/Ta. The basic techniques for the other two methods were developed. Erosion test showed that uncovered W is susceptible of flowing water velocity. At high velocity w is easy to be eroded. For solid target design slab type and rod type targets were studied. As long as the optimized neutron performance is concerned, 1MW solid target is better than mercury target.
melt containing KTaF
; Electrochemical studyMehmood, M.*; Kawaguchi, Nobuaki*; Maekawa, Hideki*; Sato, Yuzuru*; Yamamura, Tsutomu*; Kawai, Masayoshi*; Kikuchi, Kenji
Materials Transactions, 44(2), p.259 - 267, 2003/02
Times Cited Count：9 Percentile：51.96(Materials Science, Multidisciplinary)Electrochemical study has been carried out on the electro-deposition of tantalum in LiF-NaF-CaF melt containing KTaF at 700
C. This has been done for determining the mechanistic features for preparing electrolytic coating of tantalum on nickel and tungsten substrates. Electro-deposition of metallic tantalum occurs primarily by electro-reduction of Ta(V). Pure metallic tantalum without any entrapped salt is successfully deposited on tungsten by galvanostatic polarization at reasonably low current densities. An additional feature on nickel is the formation of an intermetallic compound at potential 0.25V nobler than that of pure tantalum as a result of underpotential deposition of tantalum. This intermetallic compound covers the surface within a short time followed by deposition of pure tantalum, although intermetallic compound keeps growing at the interface of pure tantalum deposit and the substrate as a result of diffusion.
Nakamichi, Masaru; ; Kawamura, Hiroshi; Sagawa, Hisashi; Nakazawa, Masaharu*
Fusion Technology 1996, 0, p.1591 - 1594, 1997/00
no abstracts in English
Izumi, Yoshinori; Kitamura, Takafumi; Kimoto, Toru; Suzuki, Mitsutoshi; Inoue, Takeshi; Naoi, Yosuke; Tamai, Hiroshi; Yamamura, Tsukasa; Kadota, Koshu*
no journal, ,
With the growing number of countries being interested in nuclear energy as a means for climate change and energy security concern, the importance of the compliance is again pointed out not only with the nuclear safety but also with the nuclear non-proliferation. Based on the abovementioned common acknowledgement, with the international collaboration, 3S initiative for the assurance of the nuclear non proliferation (safeguards), safety, and security, was proposed in Toyako summit G8 leaders declaration, and its importance was reaffirmed in LAquila summit G8 leaders declaration. In the paper, the result of study for the concrete measure of the 3S initiative will be introduced from the point of synergy effect on Fostering the 3S culture, Enforcement of the 3S package between software and hardware, Technology development for 3S, and Public acceptance activity for 3S.
