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Niwa, Masakazu; Shimada, Akiomi; Asamori, Koichi; Sueoka, Shigeru; Komatsu, Tetsuya; Nakajima, Toru; Ogata, Manabu; Uchida, Mao; Nishiyama, Nariaki; Tanaka, Kiriha; et al.
JAEA-Review 2024-035, 29 Pages, 2024/09
JAEA-Review-2024-035.pdf:1.24MB
This report is a plan of research and development (R&D) on geosphere stability for long-term isolation of high-level radioactive waste (HLW) in Japan Atomic Energy Agency (JAEA), in fiscal year 2024. The objectives and contents of this research are described in detail based on the JAEA 4th Medium- and Long-term Plan (fiscal years 2022-2028). In addition, the background of this research is described from the necessity and the significance for site investigation and safety assessment, and the past progress. The plan framework is structured into the following categories: (1) Development and systematization of investigation techniques, (2) Development of models for long-term estimation and effective assessment, (3) Development of dating techniques.
Takahashi, Hiroki; Hayashi, Naoki; Nishiyama, Koichi*; Suzuki, Takahiro*; Ishiyama, Tatsuya*
Proceedings of 16th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.271 - 274, 2019/07
In the event of an abnormal situation, a machine protection system (MPS) that immediately inhibits the beam is indispensable to minimize the damage and the radioactivation by beam loss. The existing MPS was developed during the construction period of the J-PARC. Then, the system has been working stably for more than ten years. On the other hand, since there are many MPS modules that have been used from the beginning of J-PARC operation, it is important to systematically proceed with updating (replacement) of modules as a measure against aging of MPS. However, the main components of the existing MPS module have been discontinued. Therefore, it is indispensable to redesign the MPS modules in consideration of improvement such as the compatibility with existing modules and the miniaturization. In this paper, the development status of the new module and the update plan of MPS for Linac and RCS are detailed.
Ueno, Yasuhiro*; Aoki, Masaharu*; Fukao, Yoshinori*; Higashi, Yoshitaka*; Higuchi, Takashi*; Iinuma, Hiromi*; Ikedo, Yutaka*; Ishida, Katsuhiko*; Ito, Takashi; Iwasaki, Masahiko*; et al.
Hyperfine Interactions, 238(1), p.14_1 - 14_6, 2017/11
Times Cited Count：4 Percentile：84.40(Physics, Atomic, Molecular & Chemical)Strasser, P.*; Aoki, Masaharu*; Fukao, Yoshinori*; Higashi, Yoshitaka*; Higuchi, Takashi*; Iinuma, Hiromi*; Ikedo, Yutaka*; Ishida, Katsuhiko*; Ito, Takashi; Iwasaki, Masahiko*; et al.
Hyperfine Interactions, 237(1), p.124_1 - 124_9, 2016/12
Times Cited Count：7 Percentile：89.72(Physics, Atomic, Molecular & Chemical)Adachi, Taihei*; Ikedo, Yutaka*; Nishiyama, Kusuo*; Yabuuchi, Atsushi*; Nagatomo, Takashi*; Strasser, P.*; Ito, Takashi; Higemoto, Wataru; Kojima, Kenji*; Makimura, Shunsuke*; et al.
JPS Conference Proceedings (Internet), 8, p.036017_1 - 036017_4, 2015/09
Takahashi, Hiroki; Narita, Takahiro; Nishiyama, Koichi; Usami, Hiroki; Sakaki, Hironao; Kasugai, Atsushi; Kojima, Toshiyuki*
Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.799 - 802, 2014/10
no abstracts in English
Suzuki, Sadaaki; Yagyu, Junichi; Masaki, Kei; Nishiyama, Tomokazu; Nakamura, Shigetoshi; Saeki, Hisashi; Hoshi, Ryo; Sawai, Hiroaki; Hasegawa, Koichi; Arai, Takashi; et al.
NIFS-MEMO-67, p.266 - 271, 2014/02
no abstracts in English
-ray and neutron area monitoring system of linear IFMIF prototype accelerator buildingTakahashi, Hiroki; Kojima, Toshiyuki; Narita, Takahiro; Tsutsumi, Kazuyoshi; Maebara, Sunao; Sakaki, Hironao; Nishiyama, Koichi
Fusion Engineering and Design, 88(9-10), p.2736 - 2739, 2013/10
Times Cited Count：0 Percentile：0.00(Nuclear Science & Technology)For radiation safety of the Linear IFMIF Prototype Accelerator, -ray and neutron area monitoring system are designed. This system monitors and records the measured data by using both a supervisory board in the access room and central control system. The interlock signals are sent to Personnel Protection System (PPS) and Machine Protection System (MPS) when the integrated dose value exceeds a threshold value. After receiving them, the PPS and the MPS immediately inhibit the beam operation for secure radiation safety. This monitoring system is designed to achieve a high reliability for data transfer using hardwired interlock signals and the performance of data communication between area monitoring system and control system.
Onizawa, Kunio; Masaki, Koichi; Osakabe, Kazuya*; Nishikawa, Hiroyuki*; Katsuyama, Jinya; Nishiyama, Yutaka
Nihon Hozen Gakkai Dai-9-Kai Gakujutsu Koenkai Yoshishu, p.374 - 379, 2012/07
To assure the structural integrity of a reactor pressure vessel (RPV) is known as one of the critical issues to maintain the safe long-term operation of a nuclear power plant. In Japan, the assessment methods for RPV integrity, stipulated in the codes and standards, have been endorsed by the regulatory body. Authors have initiated extensive research on the improvement of structural integrity assessment methods of RPVs. In this paper, we describe some research results obtained from the first-year activity. These include the study on revisiting the technical background of the methods, such as loading conditions, postulated crack definition, the other evaluation methods. In addition, studies on probabilistic methods for the applicability to the current rules and the standardization of the probabilistic analysis methods have been presented.
Takahashi, Hiroki; Kojima, Toshiyuki; Tsutsumi, Kazuyoshi; Narita, Takahiro; Nishiyama, Koichi; Sakaki, Hironao; Maebara, Sunao
Proceedings of 2nd International Particle Accelerator Conference (IPAC 2011) (Internet), p.1734 - 1736, 2011/09
Control system for the IFMIF/EVEDA prototype accelerator consists of six subsystems; Central Control System (CCS), Local Area Network (LAN), Personnel Protection System (PPS), Machine Protection System (MPS), Timing System (TS) and Local Control System (LCS). The Prototype Accelerator provides the deuteron beam with the beam power more than 1 MW, and this control system is required the high reliability and usability to perform various operation modes for beam commissioning. To satisfy these requirements, we are developing mainly PPS, MPS and TS at the beginning. This paper presents the status of hardware development of the PPS, MPS and TS.
Strasser, P.*; Shimomura, Koichiro*; Koda, Akihiro*; Kawamura, Naritoshi*; Fujimori, Hiroshi*; Makimura, Shunsuke*; Kobayashi, Yasuo*; Nakahara, Kazutaka*; Kato, Mineo*; Takeshita, Soshi*; et al.
Journal of Physics; Conference Series, 225, p.012050_1 - 012050_8, 2010/06
Times Cited Count：13 Percentile：95.47(Physics, Applied)Miyake, Yasuhiro*; Shimomura, Koichiro*; Kawamura, Naritoshi*; Strasser, P.*; Makimura, Shunsuke*; Koda, Akihiro*; Fujimori, Hiroshi*; Nakahara, Kazutaka*; Takeshita, Soshi*; Kobayashi, Yasuo*; et al.
Journal of Physics; Conference Series, 225, p.012036_1 - 012036_7, 2010/06
Times Cited Count：10 Percentile：92.25(Physics, Applied)Higemoto, Wataru; Ito, Takashi; Ninomiya, Kazuhiko; Heffner, R.*; Shimomura, Koichiro*; Nishiyama, Kusuo*; Miyake, Yasuhiro*
Journal of Physics; Conference Series, 225, p.012012_1 - 012012_4, 2010/06
Times Cited Count：2 Percentile：65.83(Physics, Applied)The Japan Atomic Energy Agency (JAEA)-Advanced Science Research Center (ASRC) has developed experimental equipment at the J-PARC MLF muon science facility (MUSE) for muon spin rotation/relaxation experiments. We have extracted part of the muonbeam into a muon spectrometer constructed downstream from the Decay/Surface muon beam line. The current status of our project is discussed here.
Miyake, Yasuhiro*; Shimomura, Koichiro*; Kawamura, Naritoshi*; Strasser, P.*; Makimura, Shunsuke*; Koda, Akihiro*; Fujimori, Hiroshi*; Nakahara, Kazutaka*; Kadono, Ryosuke*; Kato, Mineo*; et al.
Physica B; Condensed Matter, 404(5-7), p.957 - 961, 2009/04
Times Cited Count：12 Percentile：46.60(Physics, Condensed Matter)The muon science facility (MUSE) is one of the experimental areas of the J-PARC. The MUSE facility is located in the Materials and Life Science Facility (MLF), which is a building integrated to include both neutron and muon science programs. Construction of the MLF building was started at the beginning of 2004, and was recently completed at the end of the 2006 fiscal year. We have been working on the installation of the beamline components, expecting the first muon beam in the autumn of 2008.
SR project at J-PARC MUSEHigemoto, Wataru; Heffner, R. H.; Shimomura, Koichiro*; Nishiyama, Kusuo*; Miyake, Yasuhiro*
Nuclear Instruments and Methods in Physics Research A, 600(1), p.182 - 184, 2009/02
Times Cited Count：1 Percentile：12.17(Instruments & Instrumentation)At the J-PARC MLF muon science facility (MUSE), JAEA-ASRC is advancing the "SR project". In this project, the muon beam extraction part and the spectrometer will be installed to the downstream of the Decay/Surface muon beam line as a branch of the beam line. ASRC beam line is preparing for a muon spin rotation and relaxation (SR) experiment. Mainly, a positive surface muon beam (29MeV/c) will be used for the experiment. One of the main subject of the ASRC SR project is study of strongly correlated electron systems, especially f-electron systems. By using intense muon beam of MUSE, new insights for f-electron physics will be obtained.
SRShimomura, Koichiro*; Kadono, Ryosuke*; Nishiyama, Kusuo*; Watanabe, Isao*; Suzuki, Takao*; Pratt, F.*; Oishi, Kazuki; Mizuta, Masashi*; Saito, Mineo*; Chow, K. H.*; et al.
Physica B; Condensed Matter, 376-377, p.444 - 446, 2006/04
Times Cited Count：1 Percentile：6.19(Physics, Condensed Matter)SR in two-dimensional hydrogen bonding system squaric acidNishiyama, Kusuo*; Nishiyama, Sumie*; Shimomura, Koichiro*; Kubo, Kenya*; Maruta, Goro*; Higemoto, Wataru
Physica B; Condensed Matter, 374-375, p.433 - 436, 2006/03
Times Cited Count：2 Percentile：11.92(Physics, Condensed Matter)Squaric acid, a famous two-dimensional hydrogen-bonded system was studied by SR. From the temperature dependence of the muon spin relaxation rate as well as from the crystal axis dependences, different muon sites at low temperature and at high temperature were found. The nuclear dipole field was calculated for possible muon sites. At low temperature the muon attaches acceptor oxygen, while at 300 K the muon occupies the regular hydrogen sites.
Miyake, Yasuhiro*; Nishiyama, Kusuo*; Kawamura, Naritoshi*; Makimura, Shunsuke*; Strasser, P.*; Shimomura, Koichiro*; Beveridge, J. L.*; Kadono, Ryosuke*; Fukuchi, Koichi*; Sato, Nobuhiko*; et al.
Physica B; Condensed Matter, 374-375, p.484 - 487, 2006/03
Times Cited Count：6 Percentile：31.27(Physics, Condensed Matter)The construction of the Materials and Life Science building was started in the beginning of the fiscal year of 2004. After commissioning of the accelerator and beam transport sections in 2008, muon beams will be available for users in 2009. In this letter, the latest construction status of the J-PARC Muon Science Facility is reported.
Miyake, Yasuhiro*; Kawamura, Naritoshi*; Makimura, Shunsuke*; Strasser, P.*; Shimomura, Koichiro*; Nishiyama, Kusuo*; Beveridge, J. L.*; Kadono, Ryosuke*; Sato, Nobuhiko*; Fukuchi, Koichi*; et al.
Nuclear Physics B; Proceedings Supplements, 149, p.393 - 395, 2005/12
The J-PARC muon science experimental area is planned to be located in the integrated building of the facility for materials and life science study. One muon target will be installed upstream of the neutron target. The main feature of the facility is introduced.
Meigo, Shinichiro; Harada, Masahide; Konno, Chikara; Ikeda, Yujiro; Watanabe, Noboru; Sakamoto, Shinichi*; Muto, Suguru*; Miyake, Yasuhiro*; Nishiyama, Kusuo*; Shimomura, Koichiro*; et al.
JAERI-Conf 2001-002, p.314 - 324, 2001/03
no abstracts in English
