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Ohshima, Hiroyuki; Morishita, Masaki*; Aizawa, Kosuke; Ando, Masanori; Ashida, Takashi; Chikazawa, Yoshitaka; Doda, Norihiro; Enuma, Yasuhiro; Ezure, Toshiki; Fukano, Yoshitaka; et al.
Sodium-cooled Fast Reactors; JSME Series in Thermal and Nuclear Power Generation, Vol.3, 631 Pages, 2022/07
This book is a collection of the past experience of design, construction, and operation of two reactors, the latest knowledge and technology for SFR designs, and the future prospects of SFR development in Japan. It is intended to provide the perspective and the relevant knowledge to enable readers to become more familiar with SFR technology.
Segawa, Tomoomi; Kawaguchi, Koichi; Kato, Yoshiyuki; Ishii, Katsunori; Suzuki, Masahiro; Fujita, Shunya*; Kobayashi, Shohei*; Abe, Yutaka*; Kaneko, Akiko*; Yuasa, Tomohisa*
Proceedings of 2019 International Congress on Advances in Nuclear Power Plants (ICAPP 2019) (Internet), 9 Pages, 2019/05
A solution of plutonium nitrate and uranyl nitrate is converted into a mixed oxide by microwave heating denitration method. In the present study, for improving the efficiency of microwave heating and achieving high-temperature uniformity to produce homogeneous UO
powder, the microwave heating test of potassium chloride and uranyl nitrate solution, and numerical simulation analysis were conducted. The potassium chloride agar was adjusted to the dielectric loss, which is close to that of the uranyl nitrate solution and the optimum support table height was estimated to be 50 mm for denitration of the uranyl nitrate solution by microwave heating. The adiabator improved the efficiency of microwave heating denitration. Moreover, the powder yield was improved by using the adiabator owing to ease of scraping of the denitration product from the bottom of the denitration vessel.
C discharge at RI facilities; A Comparison of collection and oxidation methodsUeno, Yumi; Koarashi, Jun; Iwai, Yasunori; Sato, Junya; Takahashi, Teruhiko; Sawahata, Katsunori; Sekita, Tsutomu; Kobayashi, Makoto; Tsunoda, Masahiko; Kikuchi, Masamitsu
Hoken Butsuri, 49(1), p.39 - 44, 2014/03
The Japan Atomic Energy Agency has conducted a monthly monitoring of airborne C discharge at the forth research building (RI facility) of the Tokai Research and Development Center. In the current monitoring, C, which exists in various chemical forms in airborne effluent, is converted into CO
with CuO catalyst and then collected using monoethanolamine (MEA) as CO absorbent. However, this collection method has some issues on safety management because the CuO catalyst requires a high heating temperature (600
C) to ensure a high oxidation efficiency and the MEA is specified as a poisonous and deleterious substance. To establish a safer, manageable and reliable method for monitoring airborne C discharge, we examined collection methods that use different CO absorbents (MEA and Carbo-Sorb E) and oxidation catalysts (CuO, Pt/Alumina and Pd/ZrO). The results showed 100% CO collection efficiency of MEA during a 30-day sampling period under the condition tested. In contrast, Carbo-Sorb E was found to be unsuitable for the monthly-long CO collection because of its high volatile nature. Among the oxidation catalysts, the Pd/ZrO showed the highest oxidation efficiency for CH
at a lower temperature.
Yamada, Katsunori; Fujii, Katsutoshi; Kanda, Hiroshi; Higashi, Daisuke; Kobayashi, Toshiaki; Nakagawa, Masahiro; Fukami, Tomoyo; Yoshida, Keisuke; Ueno, Yumi; Nakajima, Junya; et al.
JAEA-Review 2013-033, 51 Pages, 2013/12
JAEA-Review-2013-033.pdf:2.73MB
After the accident at Fukushima Dai-ichi Nuclear Power Plant, various numerical criteria relevant to radiation protection were defined. We surveyed these criteria through internet. As a result of survey, the following 13 items were identified: (1) criteria for taking stable iodine tablets, (2) criteria for the screening of surface contamination, (3) evacuation area, sheltering area, etc., (4) activity concentrations in food, drinking water, etc., (5) dose limit for radiation workers engaged in emergency work, (6) guideline levels of radioactive substances in bathing areas, (7) criteria for use of school buildings and schoolyards, (8) restriction on planting rice, (9) acceptable activity concentrations in feedstuff, (10) acceptable activity concentrations in compost, (11) criteria for export containers and ships, (12) criteria for contaminated waste, (13) standards for radiation workers engaged in decontamination work. In this report, the basis of and issues on these criteria are summarized.
Nagai, Haruyasu; Kobayashi, Takuya; Tsuzuki, Katsunori; Terada, Hiroaki
Progress in Nuclear Science and Technology (Internet), 2, p.556 - 567, 2011/10
A general-purpose model coupling program (JAEA-Coupler) has been developed to construct local to regional scale coupled models for environmental studies. In this coupled model, calculations of component models are carried out by different processors of parallel computers and the coupler controls these processes and handles data exchanges among component models using MPI. The coupler handles the data distribution to target models with interfacing spatial, temporal, and physical discrepancies among component models. By using JAEA-Coupler, an integrated coupled model system to simulate regional water cycle and material transport has been constructed. Test calculations were carried out to simulate water movement after heavy rainfall and dissolved material transport after a hypothetical release to the atmosphere. These results show the validity of the coupled model system in appropriate data exchanges among component models and reasonable reproduction of the target phenomena.
Nagai, Haruyasu; Tsuzuki, Katsunori; Kobayashi, Takuya
Extended abstract of 9th Annual WRF Users' Workshop (Internet), 4 Pages, 2008/06
As a part of construction of numerical simulation system for environmental studies: SPEEDI-MP, coupled water cycle model was developed to simulate mesoscale water and energy circulations. The coupled model consists of the atmosphere, land-surface, hydrology, ocean-wave, and ocean-current models. Calculations of models are carried out as parallel processes and a model coupling program (model coupler) controls these processes and data exchanges among models using Message Passing Interface (MPI). The first version has been constructed with the atmospheric dynamic model MM5, land surface model SOLVEG and hydrology model RIVERS developed at Japan Atomic Energy Agency, ocean-wave model WW3, and ocean-current model POM. The introduction of WRF into this coupled model is currently under way, and coupled calculations using MM5 and WRF are compared.
Abe, Kazuyuki; Kobayashi, Takashi*; Kajima, Hisashi*; Yoshikawa, Katsunori; Nagamine, Tsuyoshi; Nakamura, Yasuo
JAEA-Technology 2008-008, 53 Pages, 2008/03
JAEA-Technology-2008-008.pdf:19.28MB
MARICO-2 is a Testing Rig for the continuous irradiation examination of ODS ferrite steel etc.. It was necessary to re-assemble of MARICO-2 in Fuel Monitoring Facility (FMF). However, MARICO-2 is not applicable a past technology of re-assembly because it is a Rig of the total length about 11 m and its hex-tube must be welded by remote control. Then, MARICO-2 re-assembly technology development was executed, the device was designed, it produced, and the procedure of re-assembly by remote control was established.
Nagai, Haruyasu; Kobayashi, Takuya; Tsuzuki, Katsunori; Kim, K.
JAEA-Data/Code 2007-002, 65 Pages, 2007/02
JAEA-Data-Code-2007-002.pdf:3.77MB
As a numerical simulation tool of the numerical simulation system SPEEDI-MP, which is applicable for various environmental studies, a model coupling program (model coupler) has been developed. It controls parallel calculations of several models and data exchanges among them to realize the dynamical coupling of the models. It is applicable for any models with three-dimensional structured grid system, which is used by most environmental and hydrodynamic models. A coupled model system for water circulation has been constructed with atmosphere, ocean, wave, hydrology, and land-surface models using the model coupler. Performance tests of the coupled model system for water circulation were also carried out for the flood event at Saudi Arabia in January 2005 and the storm surge case by the hurricane KATRINA in August 2005.
Nagai, Haruyasu; Chino, Masamichi; Terada, Hiroaki; Harayama, Takaya*; Kobayashi, Takuya; Tsuzuki, Katsunori; Kim, K.; Furuno, Akiko
JAEA-Research 2006-057, 67 Pages, 2006/09
JAEA-Research-2006-057.pdf:13.49MB
A numerical simulation system SPEEDI-MP has been developed to apply for various environmental studies. SPEEDI-MP consists of dynamical models and material transport models for the atmospheric, terrestrial, and oceanic environments, database for model inputs, and system utilities for file management, visualization, etc. As a numerical simulation tool, a model coupling program (model coupler) has been developed. A coupled model system for water circulation has been constructed with atmosphere, ocean, wave, hydrology, and land-surface models using the model coupler. System utility GUIs are based on the Web technology, allowing users to manipulate all the functions on the system using their own PCs via the internet. In this system, the source estimation function in the atmospheric transport model can be executed on the grid computer system. Performance tests of the coupled model system for water circulation were also carried out for the flood and the storm surge events.
Harada, Hideo; Nakamura, Shoji; Kato, Toshio; Kobayashi, Katsunori*; Motoishi, Shoji*; Tanase, Masakazu*
Journal of Nuclear Science and Technology, 36(8), p.635 - 640, 1999/08
Times Cited Count：3 Percentile：28.67(Nuclear Science & Technology)None
Cs(n,
)
Cs; Fundamental data for the transmutation of nuclear wasteHatsukawa, Yuichi*; Shinohara, Nobuo*; Hata, Kentaro*; Kobayashi, Katsunori*; Motoishi, Shoji*; Tanase, Masakazu*; Kato, Toshio; Nakamura, Shoji; Harada, Hideo
Journal of Radioanalytical and Nuclear Chemistry, 239(3), p.455 - 458, 1999/03
Times Cited Count：2 Percentile：21.17(Chemistry, Analytical)no abstracts in English
Harada, Hideo; Nakamura, Shoji; Kato, Toshio; Kobayashi, Katsunori*; Motoishi, Shoji*; Tanase, Masakazu*
Journal of Nuclear Science and Technology, 36(8), p.635 - 640, 1999/00
None
Cs(n,)CsKato, Toshio; Nakamura, Shoji; Harada, Hideo; Hatsukawa, Yuichi*; Shinohara, Nobuo*; Hata, Kentaro*; Kobayashi, Katsunori*; Motoishi, Shoji*; Tanase, Masakazu*
Journal of Nuclear Science and Technology, 34(5), p.431 - 438, 1997/05
no abstracts in English
Kato, Toshio; Nakamura, Shoji; Harada, Hideo; Hatsukawa, Yuichi*; Shinohara, Nobuo*; Hata, Kentaro*; Kobayashi, Katsunori*; Motoishi, Shoji*; Tanase, Masakazu*
Italian Physical Society Conference Proceedings 59, p.1335 - 1337, 1997/00
no abstracts in English
Harada, Hideo; Nakamura, Shoji; Kato, Toshio; Kobayashi, Katsunori*; Motoishi, Shoji*; Tanase, Masakazu*
Proceedings of Asia-Pacific Symposium on Radiochemistry (APSORC '97), 0 Pages, 1997/00
None
Sr(
)
Sr reactionHarada, Hideo; Sekine, Toshiaki*; Hatsukawa, Yuichi*; Shigeta, Noriko*; Kobayashi, Katsunori*; Otsuki, Tsutomu*; Kato, Toshio*
Journal of Nuclear Science and Technology, 31(3), p.173 - 179, 1994/03
no abstracts in English
Cs(n,)
CsSekine, Toshiaki*; Hatsukawa, Yuichi*; Kobayashi, Katsunori*; Harada, Hideo; Watanabe, Hisashi; Kato, Toshio*
Proceedings of International Conference on Nuclear Data for Science and Technology, p.57 - 58, 1992/00
no abstracts in English
Cs(n,)Cs reactionHarada, Hideo; Watanabe, Hisashi; Sekine, Toshiaki*; Hatsukawa, Yuichi*; Kobayashi, Katsunori*; Kato, Toshio*
Journal of Nuclear Science and Technology, 27(6), p.577 - 580, 1990/06
Times Cited Count：26 Percentile：95.89(Nuclear Science & Technology)The thermal neutron cross section of the Cs(n,)Cs reaction was measured in order to supply a basic data for the nuclear transmutation research of radioactive waste. Irradiated Cs samples were chemically purified and their -ray spectra were measured with a HPGe detector. From the intensity ratio between the Cs -rays and the Cs -ray, the capture cross section was deduced to be 0.250
0.013 barn, which is 2.3 times larger than the one measured by Stupegia.
Nagai, Haruyasu; Kobayashi, Takuya; Tsuzuki, Katsunori; Kim, K.
no journal, ,
no abstracts in English
Nagai, Haruyasu; Chino, Masamichi; Terada, Hiroaki; Kobayashi, Takuya; Tsuzuki, Katsunori
no journal, ,
no abstracts in English
