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Dr. Tomohito Tsuru of research group for radiation materials engineering received “The Young Scientists' Prize for the Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology in 2017” on 19 April, 2017..
The recipient of the award focused on the defect structures determining mechanical properties of materials and developed massively parallel atomistic simulations method. Taking advantage of super computer system in JAEA, he implemented large scale simulations of several hundred million atoms and revealed the fundamental dynamic behavior of defect structures. In addition, elements strategy becomes important to investigate alternative materials of rare metals. He dedicated to establish a new approach based on computational methods based on first-principles and elasticity theory of dislocations.
Mr. Kenji Yokoyama of research group for reactor physics and standard nuclear code system and professor Akio Yamamoto of graduate school of engineering, Nagoya university, received the 49th “Thesis Award” from the Atomic Energy Society of Japan for the paper entitled, "Cross-section adjustment methods based on minimum variance unbiased estimation,” on 28 March 2017.
In order to improve the safety and economy of nuclear reactors, it is necessary to improve the prediction accuracy by calculation through quantification of the uncertainty induced by the nuclear reaction probability data, i.e., nuclear data between neutron and nuclide in nuclear design analysis. As one of the measures, the cross-section adjustment method has been used from long time ago. In this research, a theoretical formula of the cross-section adjustment method was newly derived based on the minimum variance unbiased estimation, not the maximum likelihood estimation that was conventionally used. By this derivation, the authors showed for the first time that the theoretical formulas of the extended bias factor method and the cross-section adjustment method, which had been thought to be different theories, can be unified. This result could be a fundamental theory of the cross-section adjustment method under various conditions. We expect that the application of the cross-section adjustment method would be expanded to the great extent.
A. Ohzu, M. Kureta, S. Nakashima, M. komeda, Y. Nakatsuka
Dr. Akira Ohzu, Dr. Masao Komeda, and Dr. Masatoshi Kureta of Research Group for Nuclear Sensing, and Mr. Shinichi Nakajima and Mr. Yoshiaki Nakatsuka of Ningyo-toge Environmental Engineering Center, received the 49th Special Award for Distinguished Technology from the Atomic Energy Society of Japan for the technology entitled, " Advanced non-destructive assay technique for accurate determination of uranium mass contained in actual radioactive waste drum ", on 28 March 2017.
The recipients of the award developed an innovative correction method that is utilized in the measurements of nuclear materials by the fast neutron direct interrogation technique, and established as the accurate method that is not affected by the contents of waste drums. They successfully designed and installed a non-destructive assay system (JAWAS-N, JAEA Active Waste Assay System-Ningyo) at NIngyo-toge environmental engineering center (NEEC) site in JAEA. In addition, their studies demonstrated the effectiveness of the method using simulated waste drums which contained many kinds of solid materials. As the result, the ability of JAWAS-N as a measurement device for nuclear material accountancy has been highly regarded by IAEA, and therefore JAWAS-N was started to measure waste drums. At present, JAWAS-N has been put to practical use for uranium accountancy of actual waste drums which are filled with a variety of matrix, such as dismantling metal waste and solid uranium absorbent, etc.
Dr. Takuya Kobayashi of Research Group for Environmental Science received the Prize of “JNST Most Popular Article Award 2016” for the paper entitled, “Development of ocean dispersion concentration maps of the contaminated water released from the Fukushima Dai-ichi Nuclear Power Plant” (J. Nucl. Sci. Technol., Vol.52, 769-772 (2015)).
In this study, ocean dispersion concentration maps were developed to gain an understanding of the migration behavior of contaminated water leaking from the Fukushima Dai-ichi Nuclear Power Plant. The authors used ensemble mean values to define the semi-climatological seasonal field in calculations of the trajectories of the contaminated water. The maps were validated by comparing with actual release events in two different seasons. The results showed that the proposed method, despite its simplicity, yield relatively good reproducibility of the measurements.
Dr. Jun Koarashi of Research Group for Environmental Science received the “Award for Eminent Achievements in Nuclear Science and Technology” on 28 March 2017, from the Atomic Energy Society of Japan (AESJ), for his comprehensive study on the behavior of radiocarbon in the terrestrial environment: atmospheric discharge from nuclear facilities, environmental behavior, and radioecological impact assessment.
Of the radionuclides discharged from the nuclear fuel cycle, radiocarbon (14C) is of particular interest from the perspective of dose estimation because of the role of carbon in the metabolism of all life forms. Dr. Koarashi has developed a variety of research methodologies that enables us to evaluate the atmospheric discharge of 14C from nuclear facilities and understand the behavior of 14C in the terrestrial environment. Using these methodologies, he obtained 14C data in and around the Tokai reprocessing plant for many years, and successfully characterized spatiotemporal atmospheric dispersion and vegetation uptake of 14C and thereby assessed the radioecological impact of the 38-year operation of the reprocessing plant. He also developed a scenario to test environmental 14C models on the basis of the observation data, and with the scenario, he led the first 14C-modelling exercise in the framework of the IAEA’s EMRAS program to establish the confidence in the predictions of environmental 14C models. He has also succeeded in revealing the long-term (over several decades) accumulation and cycling behavior of 14C in the terrestrial environment, using a new, bomb-14C tracer approach. Hence, this prize was awarded for his significant achievements in nuclear science and technology, particularly in the research field related to nuclear safety and environmental assessments.
Dr. Masashi Kaneko (research group for radiochemistry) was awarded "Encouragement Award 2016 of The Japan Society of Nuclear and Radiochemical Sciences" in 11, September 2016. The title of awarded study was "Bonding study on d, f-block complexes using Mössbauer spectroscopic parameters and density functional theory."
The study contributed to the optimization of computational and analytical methods and to the precision of the theoretical calculations in order to evaluate the bonding properties of metal complexes including minor-actinides (MA) and lanthanides (Ln) ions being important for the development of partitioning and transmutation. It has been required to theoretically estimate the chemical bonding of MA or Ln ions with separation reagents and to elucidate the difference in their bonding properties for understanding MA/Ln separation behavior, leading to the development of the novel separation reagents with high selectivity toward MA ions. Density functional theory (DFT) has been useful to describe the electronic states of metal complexes, but should be discussed more carefully to estimate the bonding nature in f-block compounds including MA or Ln complexes. In this study, the computational model was optimized by means of benchmarking with Mössbauer spectroscopic parameters and the analytical method was indicated to precisely estimate the bonding properties of MA and Ln complexes. Furthermore, applying the present procedure to MA/Ln separation, it was suggested that the difference of covalent interaction with separation reagent between MA and Ln ions attributed to the selectivity of MA and Ln ions.
Dr. Masahiro Yamamoto, Deputy Director General, have received "2016 JSCE Award for Go Okamoto's Memorial Lecture" from Japan Society of Corrosion Engineering (JSCE) on 26 May 2016. The prize is awarded for his significant achievement in the field of corrosion engineering. He gave a lecture titled "Estimation of corrosion mechanisms from the data obtained by the reproduced experiments considering the actual environments - Maritime structures and nuclear facilities" to participants of JSCE Materials and Environments 2016.
This prize was awarded for his research achievements of the elucidation of corrosion mechanisms in the conditions such as maritime structures in seawater, nuclear power plant structural materials in high-temperature high-pressure water, and nuclear fuel reprocessing plant materials in nitric acid solutions. Since he has made significant achievements in the academic progress and development in the field of corrosion, he was selected to the instructor to perform the prestigious lecture to increase the knowledge and interest of JSCE members.
M. Yamamoto, T. Motooka, A. Komatsu,
F. Ueno, M. Makino(Ascend Co., Ltd.)
Dr. Atsushi Komatsu of Research Group for Corrosion Resistant Materials, Dr. Takafumi Motooka of Collaborative Laboratories for Advanced Decommissioning Science, Dr. Fumiyoshi Ueno of Fuels and Materials Engineering Division and Dr. Masahiro Yamamoto of Nuclear Science and Engineering Center received "2016 JSCE Thesis Award" from Japan Society of Corrosion Engineering (JSCE) for the paper titled "Effect of local segregation of phosphorous on intergranular corrosion of type 310 stainless steel in boiling nitric acid" (Zairyo-to-Kankyo, Vol.63, No.3, pp98-103 (2014)) on 26 May 2016.
In this paper, authors revealed the effect of phosphorus distribution at grain boundaries on corrosion of stainless steel in boiling nitric acid solution. Formerly, it had been significantly difficult to detect very small amount of phosphorus in grain boundary. Authors applied the electrochemical method to corrode very slightly under control of corrosion potential and quantity of electricity, and also applied the nanoscopic techniques of sample machining and elemental analysis. Using these methods, intergranular corrosion was understood to occur at the grain boundary where phosphorus concentrated.
Dr. Chiaki Kato of Research Group for Corrosion Resistant Materials received "2016 JSCE Technology Award" from Japan Society of Corrosion Engineering (JSCE) on 26 May 2016. The Prize is awarded for "Formalization and revision of standards of the methods of stress corrosion cracking test in high-purity water at high temperatures¡É.
This award was presented to the contribution for developing JSCE standard testing to evaluate the stress corrosion cracking (SCC) in high temperature water simulated for light water reactor environments, as the board of commissioner for establishing standard tests of JSCE. This standard test method for uniaxial constant load testing in high-purity water at high temperatures is standardized as JSCE standard (JSCE S1501: 2015 "Method of uniaxial constant load test for evaluating time to failure of metals and alloys due to stress corrosion cracking in high-purity water at high temperatures") that define the test methods such as test environment, the test procedure due to no common testing method standardized between many institutes. Moreover, the Japanese industrial standard (JIS G0511 "Stress corrosion cracking testing of metals and alloys using reverse U-bend test method"), that was the reverse U-bending test method for evaluating SCC in PWR primary water originated by JSCE, was revised. It is expected that these standards be applied in the technical testing procedure for evaluating the SCC initiation in the high-temperature water.
Dr. Atsushi Komatsu of Research Group for Corrosion Resistant Materials received "2016 JSCE Young Scientist Award" from Japan Society of Corrosion Engineering (JSCE) for study on corrosion mechanism of nuclear materials using electrochemical method on 26 May 2016.
This award was given for his research achievement of the elucidation of corrosion mechanism of nuclear materials using electrochemical techniques. For an example, he studied the corrosion mechanism of titanium in boiling nitric acid, or studied the effect of phosphorus distribution at grain boundaries on intergranular corrosion of stainless steel in transpassive region. Especially, he studied about the reduction mechanism of nitric acid on titanium to reveal why titanium corroded in nitric acid solution. He revealed the reduction of titanium oxide had an important role in reduction of nitric acid and suggested the reduction of titanium oxide was the reason why titanium corroded in nitric acid solution.
A. Kimura, H. Harada, Y. Toh
Dr. Hideo Harada, Division Head, Dr. Atsushi Kimura, Assistant Principal Researcher, and Dr. Yosuke Toh, Principal Researcher, have received the Prize for Science and Technology (Research Category) of the 2016 Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology. The Prize is awarded for " Developments of innovative neutron resonance spectroscopy and its applications" on 20 April 2016.
Highlights of achievements: Click here.
T. Matsunaga, K. Tsuduki, N. Yanase
Dr. Takeshi Matsunaga and Dr. Katsunori Tsuduki of Research Group for Environmental Science, and Dr. Nobuyuki Yanase of Research Group for Green Chemistry received "Thesis Awarded" from the Atomic Energy Society of Japan for the paper entitled, "Increase in rare earth element concentrations controlled by dissolved organic matter in river water during rainfall events in a temperate, small forested catchment" (J. Nucl. Sci. Technol., Vol.52, 514-529 (2015)) on 27 March 2016.
This paper contributed to clarify the migration behavior of transuranic elements (TRU) in the natural environment, by use of rare earth elements (REEs) which exhibit chemical similarity to TRU. There is a general difficulty to use the nuclear bomb test derived TRU in their environmental behavior research because of their limited presence on the ground. The authors have shown a scheme that a part of dissolved REEs (surrogates of TRU) in soil water migrate into adjacent river water in a form combined with dissolved natural organic matter during rainfall events. This dynamic scheme is based on repeated field observations with fine temporal increments. This study suggests that mobile TRU in the soil-water environment can be largely controlled by the natural organic matter (humic substances).
Dr. Shin-ichiro Abe of Research Group for Radiation Transport Analysis received "2015 AESJ Award for Encouragement" from the Atomic Energy Society of Japan (AESJ) for ¡ÈImprovement of a simulation technique for radiation-induced temporal malfunction on electronic devices¡É on 27 March 2016.
In the study concerning the award, models were developed in order to evaluate a rate of radiation-induced temporal malfunction (so-called soft error rate, SER) in a microelectronic device. It is important to improve accuracy and computational speed for radiation-induced nuclear reaction in device and charge collection models for SER analysis. An algorithm of deposited energy calculation with forced collision method was constructed to improve computational speed for the calculation of nuclear reaction by Particle and Heavy Ion Transport code System PHITS. As a model for collected charge calculation, the multiple sensitive volume (MSV) model was developed to take into account for spatial dependence of the charge collection efficiency. Finally, a model combining MSV with PHITS (PHITS+MSV) was established for soft error analysis.
Dr. Keiichi Shibata of Nuclear Data Center received a Thesis Award from the Atomic Energy Society of Japan for the paper entitled, ¡ÈEvaluation of Neutron Nuclear Data on Iodine Isotopes¡É (J. Nucl. Sci. Technol. Vol. 52, 1174-1185 (2015)) on the 27th of March 2016.
The Japan Atomic Energy Agency (JAEA) released the evaluated nuclear data library JENDL-4.0, which contains data for 406 nuclides, in 2010. After that, we have continued to evaluate fission product (FP) data. The paper deals with evaluation of neutron cross-sections of iodine-127, 128, 129, 130, 131, 135 in the energy region from 10^-5 eV to 20 MeV. In the energy region above resonances, we used a nuclear reaction model code developed in JAEA together with optimized model parameters. As a result, the present evaluation reproduces the measurements for iodine-127, 129, and it is much better than JENDL-4.0 and other libraries. The use of sophisticated nuclear reaction models and optimized parameters leads to improvements of iodine-128, 130, 131, 135 data for which measurements are few. The presently evaluated data will be compiled into the next release of JENDL, and utilized for the development of nuclear energy and other applications.
JNST Most Cited Article Award 2015 was presented to the paper of Osamu Iwamoto et al. in Nuclear Data Center, entitled "JENDL Actinoid File 2008" published in JNST Vol. 46, page 510-528, 2009 for being frequently cited during the first 5 years after its publication.
The paper described the evaluated nuclear data file, JENDL Actinoid File 2008, which was released in March 2008. It included the nuclear data of neutron-induced reactions for 79 actinide nuclides extensively updated based on a newly developed nuclear reaction model code CCONE and the latest experimental data. It is expected to improve accuracies to simulate nuclear reactors with this file. Its major part is adopted by the latest general purpose file JENDL-4.0 released in 2010.
The data can be downloaded from http://wwwndc.jaea.go.jp/ftpnd/jendl/jendl-ac-2008.html.
M. Koizumi, P. Schillebeeck, H. Harada
On 27 March 2016, the 48th Award for Distinguished Technology Development of the Atomic Energy Society of Japan was presented to the joint NRD (Neutron Resonance Densitometry) development team for their work of "Development of Neutron Resonance Densitometry for Accounting Nuclear Materials with Complex Geometries and Compositions". The team was composed of researchers from JAEA-NSEC (Nuclear Science and Engineering Center), EC-JRC-IRMM (Institute for Reference Materials and Measurement) and JAEA-ISCN (Integrated Support Center for Nuclear Nonproliferation and Nuclear Security). Drs. H. Harada (JAEA-NSEC), P. Schillebeeckx (EC-JRC-IRMM), and M. Koizumi (JAEA-ISCN) received the commendation plaque on behalf of the joint NRD development team.
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