2016.09.29
Encouragement Award 2016 of The Japan Society of Nuclear and Radiochemical Sciences

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."

M. Kaneko

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.


2016.07.15
2016 JSCE Award for Go Okamoto's Memorial Lecture

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.

M. Yamamoto

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.


2016.07.15
2016 JSCE Thesis Award

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.

M. Yamamoto, T. Motooka, A. Komatsu, F. Ueno, M. Makino(Ascend Co., Ltd.)

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.


2016.07.15
2016 JSCE Technology Award

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°….

C. Kato

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.


2016.07.15
2016 JSCE Young Scientist Award

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.

A. Komatsu

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.


2016.05.18
The Prize for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology

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.

A. Kimura, H. Harada, Y. Toh

Highlights of achievements: Click here.


2016.05.18
The 2016 Thesis Award

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.

T. Matsunaga, K. Tsuduki, N. Yanase

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).


2016.05.18
2015 AESJ Award for Encouragement

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 °»Improvement of a simulation technique for radiation-induced temporal malfunction on electronic devices°… on 27 March 2016.

S. Abe

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.


2016.05.18
The 2016 Thesis Award

Dr. Keiichi Shibata of Nuclear Data Center received a Thesis Award from the Atomic Energy Society of Japan for the paper entitled, °»Evaluation of Neutron Nuclear Data on Iodine Isotopes°… (J. Nucl. Sci. Technol. Vol. 52, 1174-1185 (2015)) on the 27th of March 2016.

K. Shibata

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.
eprint: http://www.tandfonline.com/eprint/KBrWnz3y63DzkvI5RGdU/full.


2016.05.18

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.

O. Iwamoto

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.


2016.05.18
2016 AESJ Award for Distinguished Technology Development

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.
Click here for details

M. Koizumi, P. Schillebeeck, H. Harada


2015.06.09
2015 AESJ Award for Distinguished Technology

Dr. Tetsushi Nagano and Dr. Hirochika Naganawa of Research Group for Green Chemistry, and Mr. Yutaka Mita of Ningyo-toge Environmental Engineering Center have received the 47th Award for Distinguished Technology from the Atomic Energy Society of Japan for the technology entitled, "Development of purification technology for radioactive liquid wastes originated from decontamination by "emulsion flow" method" on 21 March 2015.

H. Naganawa, T. Nagano, Y. Mita

The recipients of the award have developed a purification technology to remove uranium selectively from a large amount of radioactive liquid wastes containing uranium by using new liquid-liquid extraction manner, "emulsion flow method" where simplicity, safety, low cost, high processing speed, and high efficiency go together. This technology can actualize more than tenfold processing speed and less than one fifth cost for the removal of uranium from radioactive waste solutions to the level less than its effluent standard in comparison with typical conventional liquid-liquid extraction manner of mixer-settler method and column method filled with ion exchange resin. In addition, the emulsion flow extractor having no drive part in its main body has less trouble and is safer than the conventional extractor. The emulsion flow method is expected to be widely useful for the treatment of domestic radioactive waste solutions, moreover, has attracted attention in the recovery of rare metals (minor metals) and many industries other than atomic energy area.


2015.04.23
The Prize for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology

Drs. Masamichi Chino, Haruyasu Nagai, Hiroaki Terada and Genki Katata have received the Prize for Science and Technology (Development Category) of the 2015 Commendation for Science and Technology by the Minister of Education, Culture, Sports, Science and Technology. The Prize is awarded for "Development of WSPEEDI: Worldwide version of System for Prediction of Environmental Emergency Dose Information"

H. Terada, M. Chino, H. Nagai, G. Katata

Considering the increase of nuclear facilities in the world to meet growing energy need, the prediction of atmospheric transport of radionuclides is important for countermeasures against accidental massive release of radionuclides from those facilities. A simulation system for detailed and quick prediction of atmospheric dispersion, surface deposition, and radiological doses for any nuclear accident in the world, which consists of numerical models considering sophisticated dispersion and deposition processes and system software for advanced support functions, has been developed and validated by using data obtained by field experiments and at some nuclear accidents. The system has been applied to the analysis of source term and atmospheric dispersion of radionuclides released from the Fukushima Dai-ichi Nuclear Power Station, and the results have been used for countermeasures in Japan and impact assessments by World Health Organization (WHO), United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR), etc. The system was also used to nuclear test by North Korea to provide prediction of atmospheric dispersion to the national government, showing its completeness as practical system. This system contributes to the national and local governments by providing useful information for their countermeasures, such as planning of monitoring and public safety, against nuclear accidents at home and abroad. This system is also applicable to non-nuclear field, such as real-time prediction for long-range atmospheric transport of substance of concern.


2015.04.23
The 2015 Thesis Award

Dr. Hiroaki Terada and Dr. Haruyasu Nagai of Research Group for Environmental Science, and Professor Hiromi Yamazawa of Nagoya University received °»Thesis Awarded°… from the Atomic Energy Society of Japan for the paper entitled, "Validation of a Lagrangian atmospheric dispersion model against middle-range scale measurements of 85Kr concentration in Japan" (J. Nucl. Sci. Technol., Vol.50, 1198-1212 (2013)) on 21 March 2015.

H. Yamazawa, H. Terada, H. Nagai

This paper showed the validation of the atmospheric dispersion model in horizontally hundreds-of-km (middle-range) scale area. In the scale area, the validation of the atmospheric dispersion model has not been done sufficiently due to the limitation of available data. By focusing on the atmospheric dispersion of 85Kr discharged from the Rokkasho reprocessing plant, a Lagrangian dispersion model was validated for the middle-range scale by using measurement data of atmospheric concentration of 85Kr at several monitoring points in Japan. This study also proposed a method to get a reasonable horizontal diffusion coefficient according to model grid resolution.


2015.04.23
JNST Most Popular Article Award 2014

Dr. Takuya Kobayashi of Research Group for Environmental Science received the Prize of "JNST Most Popular Article Award 2014" for the paper entitled, "Source term estimation of atmospheric release due to the Fukushima Dai-ichi Nuclear Power Plant accident by atmospheric and oceanic dispersion simulations" (J. Nucl. Sci. Technol., Vol.50, 255-264 (2013)).

T. Kobayashi

The paper showed that the source term of the atmospheric release of I-131 and Cs-137 due to the Fukushima Dai-ichi Nuclear Power Plant accident estimated by previous studies was validated and refined by coupling atmospheric and oceanic dispersion simulations with observed Cs-134 in seawater collected from the Pacific Ocean. By assuming the same release rate for Cs-134 and Cs-137, the sea surface concentration of Cs-134 was calculated using the previously estimated source term and was compared with measurement data. Simulation results in some area of the eastern North Pacific showed a tendency of underestimation against observed data. So, the release period was separated into small segments and atmosphere-ocean dispersion simulation was carried out for each release segment. Then, contribution rate of each release segment to sea surface concentration of Cs-134 at each measuring point was obtained. Finally, the release rate was refined based on the contribution rate for each release segment to reduce underestimation of measurements. As a result, the source term was re-estimated to have a larger release amount than previously estimated one.


2015.04.23
JNST Most Popular Article Award 2014

Dr. Tatsuhiko Sato of Research Group for Radiation Transport Analysis and his colleagues received the Prize of "JNST Most Popular Article Award 2014" for the paper entitled "Particle and Heavy Ion Transport Code System PHITS, Version 2.52" (J. Nucl. Sci. Technol., Vol.50, 913-923 (2013)).

PHITS is a general purpose Monte Carlo particle transport simulation code developed under collaboration between JAEA, RIST, KEK and several other institutes. It can deal with the transport of all particles over wide energy ranges, using several nuclear reaction models and nuclear data libraries. The paper describes the update features of PHITS version 2.52, which was released in 2013. PHITS2.52 had been greatly improved from the previously released version, PHITS2.24, in terms of not only the code itself but also the contents of its package, such as the attached data libraries. Due to these improvements, PHITS became a more powerful tool for particle transport simulation applicable to various research and development fields, such as nuclear technology, accelerator design, medical physics, and cosmic-ray research.