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Journal Articles

Progress report of Japanese simulation research projects using the high-performance computer system Helios in the International Fusion Energy Research Centre

Ishizawa, Akihiro*; Idomura, Yasuhiro; Imadera, Kenji*; Kasuya, Naohiro*; Kanno, Ryutaro*; Satake, Shinsuke*; Tatsuno, Tomoya*; Nakata, Motoki*; Nunami, Masanori*; Maeyama, Shinya*; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 92(3), p.157 - 210, 2016/03

The high-performance computer system Helios which is located at The Computational Simulation Centre (CSC) in The International Fusion Energy Research Centre (IFERC) started its operation in January 2012 under the Broader Approach (BA) agreement between Japan and the EU. The Helios system has been used for magnetised fusion related simulation studies in the EU and Japan and has kept high average usage rate. As a result, the Helios system has contributed to many research products in a wide range of research areas from core plasma physics to reactor material and reactor engineering. This project review gives a short catalogue of domestic simulation research projects. First, we outline the IFERC-CSC project. After that, shown are objectives of the research projects, numerical schemes used in simulation codes, obtained results and necessary computations in future.

JAEA Reports

Materials for the information security education

Yashiro, Shigeo; Aoki, Kazuhisa; Sato, Tomohiko; Tanji, Kazuhiro

JAEA-Review 2013-038, 123 Pages, 2014/01

JAEA-Review-2013-038.pdf:23.19MB

With the rapid progress of the utilization of Information Technology (IT), IT infrastructure (network environment and information system) became crucial as a lifeline for promoting business. At the same time, changes in the circumstances surrounding the IT infrastructure globalize the threat of cyber attacks and increase the risk of the information security such as unlawful access to an information system, viral infection, an alteration of a website, disclosure of subtlety information, destruction of an information system and so on. Information security measure is an important issue in Japan Atomic Energy Agency (JAEA). In order to protect the information property of JAEA from the threat, Center for Computational Science & e-Systems (CCSE) has been taking triadic measures for information security: (1) to lay down a set of information security rules, (2) to introduce security equipments to backbone network and (3) to provide information security education. This report is a summary of the contents of the information security education by e-learning.

JAEA Reports

Introduction of the WAN accelerator in JAEA network

Hirayama, Takashi; Kannari, Masaaki; Sato, Tomohiko

JAEA-Testing 2012-002, 29 Pages, 2012/06

JAEA-Testing-2012-002.pdf:2.98MB

In pursuance of "The Optimization Plan on the network of JAEA", which aims to ensure network reliability and information security and to improve convenience in using the network, we are engaged in the optimization of inter-institute/center network bandwidth. This is a record of an introduction of WAN accelerator into the network to Ningyo-toge Environmental Engineering Center which bandwidth is limited due to a geographically constraint.

Journal Articles

Burning of MOX fuels in LWRs; Fuel history effects on thermal properties of hull and end piece wastes and the repository performance

Hirano, Fumio; Sato, Seichi*; Kozaki, Tamotsu*; Inagaki, Yaohiro*; Iwasaki, Tomohiko*; Oe, Toshiaki*; Kato, Kazuyuki*; Kitayama, Kazumi*; Nagasaki, Shinya*; Niibori, Yuichi*

Journal of Nuclear Science and Technology, 49(3), p.310 - 319, 2012/03

AA2011-0278.pdf:0.56MB

 Times Cited Count:0 Percentile:0.01(Nuclear Science & Technology)

The thermal impacts of hull and end piece wastes from the reprocessing of MOX spent fuels burned in LWRs on repository performance were investigated. The heat generation rates in MOX spent fuels and the resulting heat generation rates in hull and end piece wastes change depending on the fuel histories including the burn-up of UO$$_{2}$$ spent fuels, the cooling period before reprocessing, the storage period of fresh MOX fuels. The heat generation rates of hull and end piece wastes from the reprocessing of MOX spent fuels with any of those histories are significantly larger than those from UO$$_{2}$$ spent fuels with burn-ups of 45 GWd/THM. If a temperature below 80$$^{circ}$$C is specified for cement-based materials used in waste packages after disposal, the allowable number of canisters containing compacted hull and end pieces in a package for 45 GWd-MOX needs to be limited to a value of 0.7 to 1.6, which is significantly lower than the value of 4.0 for 45 GWd-UO$$_{2}$$.

Journal Articles

Roles of arabidopsis ${it AtREV1}$ and ${it AtREV7}$ in translation synthesis

Takahashi, Shinya; Sakamoto, Ayako; Sato, Shusei*; Kato, Tomohiko*; Tabata, Satoshi*; Tanaka, Atsushi

Plant Physiology, 138(2), p.870 - 881, 2005/06

 Times Cited Count:45 Percentile:72.59(Plant Sciences)

The error-prone DNA translation synthesis (error-prone TLS) has been well characterized in yeast and mammalians, but not in higher plants. Recent finding of an ${it AtREV3}$-disrupted mutant (${it rev3}$) in Arabidopsis suggested that the error-prone TLS is significant for tolerance to DNA damages in higher plant. To clarify the details of the error-prone TLS in higher plants, we analyzed the T-DNA inserted Arabidopsis mutants defective in ${it AtREV1}$ or ${it AtREV7}$ genes, which are thought to be involved in the error-prone TLS system. The ${it AtREV1}$ mutant (${it rev1}$) was sensitive to UV-B and cisplatin. The ${it AtREV7}$ mutant (${it rev7}$) was sensitive to long-term UV-B and cisplatin. These results suggest TLS mechanism exists in a higher plant and show that ${it AtREV1}$ and ${it AtREV7}$ have important roles in tolerating exposure to DNA-damaging agents, but their function might be redundant.

Oral presentation

Development of neutron spectrometer for measurement of fuel ratio planned on ITER

Nishitani, Takeo; Okada, Koichi; Sato, Satoshi; Sasao, Mamiko*; Iwasaki, Tomohiko*; Sugawara, Takanori; Shinto, Katsuhiro*; Kitajima, Sumio*; Nomura, Ken*

no journal, , 

no abstracts in English

Oral presentation

Study of ${it AtREV1}$ and ${it AtREV7}$ involved in the translesion synthesis in Arabidopsis

Takahashi, Shinya*; Sakamoto, Ayako; Shimizu, Kikuo*; Sato, Shusei*; Kato, Tomohiko*; Tanaka, Atsushi

no journal, , 

no abstracts in English

Oral presentation

Development of simultaneous measurement for DT and DD neutrons by TOF method

Okada, Koichi; Kondo, Keitaro; Sato, Satoshi; Nishitani, Takeo; Nomura, Ken*; Okamoto, Atsushi*; Iwasaki, Tomohiko*; Kitajima, Sumio*; Sasao, Mamiko*

no journal, , 

no abstracts in English

Oral presentation

Development of hydride neutron absorber for fast reactor, 4; Safety analysis of fast reactor with hydride neutron absorber

Sato, Ikken; Iwasaki, Tomohiko*; Konashi, Kenji*

no journal, , 

no abstracts in English

Oral presentation

Nuclear design of hydride neutron absorber for fast reactor, 2; Safety analysis of fast reactor with Hf hydride control rod

Sato, Ikken; Iwasaki, Tomohiko*; Konashi, Kenji*

no journal, , 

Concerning safety characteristics of FBR core with hydride control materials, representative accidents for design basis and those beyond the design basis were selected and transient responses were evaluated. Based on this result, it was concluded that no unfavorable response was expected for this option.

Oral presentation

High-order harmonics from relativistic electron spikes

Pirozhkov, A. S.; Kando, Masaki; Esirkepov, T. Z.; Pikuz, T.; Faenov, A. Ya.*; Ogura, Koichi; Hayashi, Yukio; Kotaki, Hideyuki; Ragozin, E. N.*; Neely, D.*; et al.

no journal, , 

Oral presentation

Source structure of high-order harmonics from relativistic electron spikes

Pirozhkov, A. S.; Kando, Masaki; Esirkepov, T. Z.; Pikuz, T.; Faenov, A. Ya.*; Ogura, Koichi; Hayashi, Yukio; Kotaki, Hideyuki; Ragozin, E. N.*; Neely, D.*; et al.

no journal, , 

Oral presentation

High-resolution XUV imaging of catastrophes in relativistic plasma

Pirozhkov, A. S.; Kando, Masaki; Esirkepov, T. Z.; Pikuz, T.; Faenov, A. Ya.*; Ogura, Koichi; Hayashi, Yukio; Kotaki, Hideyuki; Ragozin, E. N.*; Neely, D.*; et al.

no journal, , 

Oral presentation

Estimation of depth profile of radiocesium in soil based on characteristics of $$gamma$$-ray spectra obtained by airborne radiation monitoring

Ochi, Kotaro; Sasaki, Miyuki; Ishida, Mutsushi*; Sato, Tomohiko*; Hamamoto, Shoichiro*; Nishimura, Taku*; Sanada, Yukihisa

no journal, , 

A large amount of radiocesium ($$^{134}$$Cs & $$^{137}$$Cs) were released into the atmosphere as a result of 2011 Fukushima Daiichi Nuclear Power Plant (FDNPP) accident. To estimate the impact of the accident to the environment, dose rate around FDNPP have been measured by MEXT. Dose rate nearby FDNPP, however, still stay high even though decontamination work was carried out, which means it is necessary to develop an effective decontamination method promptly. Information of depth profile of radiocesium in soil is required to realize it, though, most of measurement methods have trouble due to collection and measurement of soil samples. As we have developed the radiation measurement techniques using unmanned aerial vehicle to measure dose rate distribution over wide areas for years, we attempt to establish the estimation method of depth profile of radiocesium in soil based on characteristics of $$gamma$$-ray spectra obtained by airborne radiation monitoring in this paper.

Oral presentation

R&D for introducing advanced fuels contributing to safety improvement of current LWRs, 3; SiC for BWR

Sato, Hisaki*; Kakiuchi, Kazuo*; Ishibashi, Ryo*; Ikegawa, Tomohiko*; Kondo, Takao*; Yamashita, Shinichiro; Fukahori, Tokio

no journal, , 

SiC composite materials applied to a cladding tube and a channel box for BWR have been developed for introduction of the accident tolerant fuel to an existing LWRs. The outline of the outcome in fiscal year 2017 will be introduced by this presentation.

Oral presentation

Examination of measurement method of the hardness by Laser Induced Breakdown Spectroscopy (LIBS)

Okazaki, Kodai*; Kawakami, Tomohiko*; Abe, Yuta; Otaka, Masahiko; Sato, Ikken

no journal, , 

no abstracts in English

16 (Records 1-16 displayed on this page)
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