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Sakashita, Satoshi; Okui, Masahiro; Yoshida, Tadayoshi; Uezu, Yasuhiro; Okuda, Eiichi
JAEA-Review 2022-012, 42 Pages, 2022/06
JAEA-Review-2022-012.pdf:2.96MB
In this report, results of investigating fire alarm detectors status in order to understand the actual situation of false alarm occurrence and measures to systematically update of them. Based on results of this investigation, measures to systematically update of detectors were taken in order to reduce false fire alarm reports in a harsh environment and aged detectors. Numbers of detectors, false alarms were investigated. Furthermore, causes of their occurrence were investigated for three years (2018-2020). As a result of this investigation, it was found that most of the 34,400 fire alarm detectors in JAEA have been used for more than 20 years. In the last 3 years, 65 false alarms have been reported, 60% of which were found to have been used where the environment should be improved. It was also found that there are many cases where false alarms are reported from a detector within 14 years after installation. Based on the above, three basic policies were formulated. First of all, database will be built for fire alarm maintenance and inspection, secondly, installation location of fire alarm will be improved, and finally, detectors will be updated with reference to the manufacture's plan. According to the three basic policies, it is considered that the reports of false fire alarms will be able to reduced.
Noro, Naoko; Scharmer, C.*; Kawakubo, Yoko; Sekine, Megumi; Okuda, Masahiro; Inoue, Naoko
Proceedings of INMM & ESARDA Joint Virtual Annual Meeting (Internet), 10 Pages, 2021/08
In the amid of COVID-19 pandemic, Integrated Support Center for Nuclear Nonproliferation and Nuclear Security (ISCN) of Japan Atomic Energy Agency (JAEA) developed and conducted regional training course on physical protection of nuclear materials and facility (PP RTC) for Asian countries in October 19-30, 2020 as an online course. Maintaining the quality of in-person two-week training through online platforms was a big challenge. For effective learning, ISCN combined e-learning (self-study) and interactive learning (virtual classroom) for its online PP RTC, and engaged participants through group exercise via Zoom meeting. The paper will describe efforts of ISCN and SNL to develop the online curriculum of PP RTC and share lessons learned and good practices for course development and course implementation. The paper will also explore future application of online contents in nuclear security capacity building even after the pandemic.
Okuda, Masahiro; Van Dassen, L.*; Lock, B.*; Inoue, Naoko; Noro, Naoko; Kawakubo, Yoko; Sekine, Megumi
Proceedings of INMM & ESARDA Joint Virtual Annual Meeting (Internet), 9 Pages, 2021/08
Inoue, Naoko; Noro, Naoko; Kawakubo, Yoko; Sekine, Megumi; Okuda, Masahiro; Hasegawa, Nobuhiko*; Naoi, Yosuke
Proceedings of INMM & ESARDA Joint Virtual Annual Meeting (Internet), 10 Pages, 2021/08
Integrated Support Center for Nuclear Nonproliferation and Nuclear Security (ISCN) of Japan Atomic Energy Agency (JAEA) celebrated its 10th anniversary in December 2020. One of its pillars is capacity building support mainly to Asian countries. 183 trainings were implemented with more than 4,600 participants since its establishment, however, the COVID-19 pandemic impacted in the implementation of the trainings. ISCN/JAEA has started to develop the online trainings since April 2020, and implemented two regional trainings, Physical Protection and State System of Accounting for and Control (SSAC) for IAEA Safeguards in October and November 2020, respectively. The efforts continue in further development of trainings/workshops, including the regional training on Additional Protocol for IAEA Safeguards Agreement Commodity Identification Training, and other two national workshops with foreign instructors. Online training can provide not only training opportunities for those who have difficulty in traveling for security and safety reasons including under the travel restriction by COVID-19 pandemic, but also could serve in making them more effective and efficient, especially by the combination with in-person trainings. The pandemic, as a result, accelerate ISCN/JAEA to develop and implement the online trainings, which key is the international collaboration with the partners including IAEA, DOE/NNSA and Sandia National Laboratories and International Nuclear Nonproliferation and Security Academy (INSA) of the Korea Institute of Nuclear Nonproliferation and Control (KINAC). This paper will provide the efforts of ISCN/JAEA how to address the online training development and implementation, current status, lesson learned, and future plan.
Inoue, Rintaro*; Oda, Takashi*; Nakagawa, Hiroshi; Tominaga, Taiki*; Saio, Tomohide*; Kawakita, Yukinobu; Shimizu, Masahiro*; Okuda, Aya*; Morishima, Ken*; Sato, Nobuhiro*; et al.
Scientific Reports (Internet), 10, p.21678_1 - 21678_10, 2020/12
Times Cited Count：3 Percentile：13.48(Multidisciplinary Sciences)Incoherent quasielastic neutron scattering (iQENS) is a fascinating technique for investigating the internal dynamics of protein. However, both low flux of neutron beam and absence of analytical procedure for extracting the internal dynamics from iQENS profile have been obstacles for studying it under physiological condition (in solution). Thanks to the recent development of neutron source, spectrometer and computational technique, they enable us to decouple internal dynamics, translational and rotational diffusions from the iQENS profile. The internal dynamics of two proteins: globular domain protein (GDP) and intrinsically disordered protein (IDP) in solution were studied. It was found that the average relaxation rate of IDP was larger than that of GDP. Through the detailed analyses on their internal dynamics, it was revealed that the fraction of mobile H atoms in IDP was much higher than that in GDP. Interestingly, the fraction of mobile H atoms was closely related to the fraction of H atoms on highly solvent exposed surfaces. The iQENS study presented that the internal dynamics were governed by the highly solvent exposed amino acid residues depending upon protein molecular architectures.
Nakagawa, Yosuke; Sukegawa, Hidetoshi; Naoi, Yosuke; Inoue, Naoko; Noro, Naoko; Okuda, Masahiro
Dai-41-Kai Nihon Kaku Busshitsu Kanri Gakkai Nenji Taikai Kaigi Rombunshu (Internet), 4 Pages, 2020/11
The physical protection exercise field, a facility equipped with various types of equipment such as sensors, cameras and fences that are used at nuclear facilities, is an effective tool for training on nuclear security at ISCN/JAEA, if it is carried out in-person. Due to the COVID-19 pandemic, the virtual tour of the facility is developed for the online training courses so that they could be more effective. The article explains the initial development of the virtual tour with some improvement inspired by using it on some occasions as well as a prospect of effective use of the virtual tour based on its characteristics.
Komoto, Shigeo*; Chuko, Tomotaka*; Hisamatsu, Shugo; Okuda, Yasuhiro*; Masu, Hyuma*; Takahashi, Masahiro*; Kishikawa, Keiki*
Crystal Growth & Design, 15(6), p.2723 - 2731, 2015/05
Times Cited Count：16 Percentile：75.03(Chemistry, Multidisciplinary)Piezoluminescence and liquid crystallinity of anthracene-based bispyridinium salts were investigated in stimulus responsive luminescent organic crystals and luminescent ionic liquid crystals. The salts possess an anthracene moiety as a fluorophore in their center, and the pyridiniums attached to the anthracene moiety are substituted with trialkoxybenzyl groups. Single crystals of the salts bearing two trimethoxybenzyl groups were obtained as solvates. Ethyl acetate, acetone, and dioxane solvates of the chlorides have almost the same crystal structures with one-dimensional channels. Grinding of the solvated crystals caused the extrusion of the included solvent molecules, which resulted in the red shifts of their fluorescence in the solid state. Tris(octyloxy)benzyl and tris(dodecyloxy)benzyl derivatives exhibited rectangular columnar liquid crystals upon being heated for their bromide and tetrafluoroborate salts and upon being cooled for their hexafluorophosphate salts.
Furukawa, Masaru; Tokuda, Shinji; Wakatani, Masahiro*
Plasma Physics and Controlled Fusion, 46(2), p.409 - 421, 2004/02
Times Cited Count：7 Percentile：22.95(Physics, Fluids & Plasmas)In the H-mode (high-confinement mode) pedestal region of a static or a toroidally rotating D-shaped tokamak plasma, the separatrix or the X-point affects the high-n ballooning stability (n: toroidal mode number) only in a thin layer in the pedestal region. Therefore, D-shaping effectively stabilizes the ballooning modes even for a toroidally rotating plasma with a separatrix.
ballooning modes in tokamaksFurukawa, Masaru; Tokuda, Shinji; Wakatani, Masahiro*
Nuclear Fusion, 43(6), p.425 - 429, 2003/06
We have found numerically that damping phases appear in the time evolution of the perturbation energy of high- ballooning modes in the presence of toroidal shear flows. The damping dominates exponential growth which occurs in the bad curvature region, resulting in stabilization of ballooning modes. D-shaping of plasma cross-section, reduction of aspect ratio, and arrangement of X-point at inner side of the torus enhance the stabilization effect of the toroidal flow through this mechanism.
ballooning modes in tokamaksFurukawa, Masaru; Tokuda, Shinji; Wakatani, Masahiro*
Nuclear Fusion, 43(6), p.425 - 429, 2003/06
Times Cited Count：10 Percentile：31.75(Physics, Fluids & Plasmas)We have found numerically that damping phases appear in the time evolution of the perturbation energy of high- ballooning modes in the presence of toriodal flow shear, where n is a toroidal mode number. The damping dominates exponential growth which occurs in the bad curvature region, resulting in stabilization of ballooning modes. D-shaping of plasma cross-section, reduction of aspect ratio, and arrangement of an X-point at inner side of the torus enhance the stabilization effect of the toroidal flow shear through this mechanism.
Idomura, Yasuhiro; Tokuda, Shinji; Kishimoto, Yasuaki; Wakatani, Masahiro*
Nuclear Fusion, 41(4), p.437 - 445, 2001/04
Times Cited Count：13 Percentile：40.95(Physics, Fluids & Plasmas)no abstracts in English
B zonal flow in electron temperature gradient driven turbulenceIdomura, Yasuhiro; Wakatani, Masahiro*; Tokuda, Shinji
Physics of Plasmas, 7(9), p.3551 - 3566, 2000/09
Times Cited Count：55 Percentile：82.38(Physics, Fluids & Plasmas)no abstracts in English
*; Tokuda, Shinji; Wakatani, Masahiro*
Purazuma, Kaku Yugo Gakkai-Shi, 75(2), p.131 - 142, 1999/02
no abstracts in English
Kamada, Yutaka; Yoshino, Ryuji; Neyatani, Yuzuru; Sato, Masayasu; Tokuda, Shinji; Azumi, Masafumi; Takeji, Satoru; Ushigusa, Kenkichi; Fukuda, Takeshi; Mori, Masahiro; et al.
Plasma Physics and Controlled Nuclear Fusion, 38(8), p.1387 - 1391, 1996/08
Times Cited Count：45 Percentile：78.98(Physics, Fluids & Plasmas)no abstracts in English
Seki, Masahiro; ; Matsuda, Shinzaburo; *; *; *; Nishi, Masataka; *; Tokuda, Shinji; *; et al.
Denki Gakkai Gijutsu Hokoku, 0(613), 102 Pages, 1996/00
no abstracts in English
Noro, Naoko; Kimura, Yoshiki; Okuda, Masahiro
no journal, ,
The presentation focuses on ISCN's methodology for needs analysis and curriculum development using the existing nuclear energy cooperation framework. The method applied to develop its nuclear forensics training course.
Noro, Naoko; Kawakubo, Yoko; Sekine, Megumi; Okuda, Masahiro; Numata, Masaaki; Inoue, Naoko
no journal, ,
COVID-19 pandemic severely impacted capacity building support activities. Due to the travel restrictions, it became impossible to conduct in-person training for Asian participants, and domestic courses had to overcome various challenges as well. With the prolonged pandemic, it is essential to continue providing capacity building support in nuclear security field. The paper will share the experience of ISCN/JAEA on its capacity building support activities under COVID-19, and propose methods for capacity building support in the post COVID-19.
Okuda, Masahiro; Noro, Naoko; Inoue, Naoko
no journal, ,
Evaluation and improvement of nuclear security culture promotion activity is one of the challenges for nuclear operators. Under such situation, ISCN held a workshop on nuclear security culture self-assessment to introduce IAEA's guideline and share experts' assessment methods from Indonesia, Bulgaria, and Japan. This presentation introduces contents of the workshop and discusses ways to strengthen nuclear security culture promotion activity.
