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JAEA Reports

Conceptual design of multipurpose compact research reactor; Annual report FY2010 (Joint research)

Imaizumi, Tomomi; Miyauchi, Masaru; Ito, Masayasu; Watahiki, Shunsuke; Nagata, Hiroshi; Hanakawa, Hiroki; Naka, Michihiro; Kawamata, Kazuo; Yamaura, Takayuki; Ide, Hiroshi; et al.

JAEA-Technology 2011-031, 123 Pages, 2012/01

JAEA-Technology-2011-031.pdf:16.08MB

The number of research reactors in the world is decreasing because of their aging. However, the planning to introduce the nuclear power plants is increasing in Asian countries. In these Asian countries, the key issue is the human resource development for operation and management of nuclear power plants after constructed them, and also the necessity of research reactor, which is used for lifetime extension of LWRs, progress of the science and technology, expansion of industry use, human resources training and so on, is increasing. From above backgrounds, the Neutron Irradiation and Testing Reactor Center began to discuss basic concept of a multipurpose low-power research reactor for education and training, etc. This design study is expected to contribute not only to design tool improvement and human resources development in the Neutron Irradiation and Testing Reactor Center but also to maintain and upgrade the technology on research reactors in nuclear power-related companies. This report treats the activities of the working group from July 2010 to June 2011 on the multipurpose low-power research reactor in the Neutron Irradiation and Testing Reactor Center and nuclear power-related companies.

Journal Articles

R&D on major components of control system for ITER blanket maintenance equipment

Takeda, Nobukazu; Kakudate, Satoshi; Matsumoto, Yasuhiro; Kozaka, Hiroshi; Aburadani, Atsushi; Negishi, Yusuke; Nakahira, Masataka*; Tesini, A.*

Fusion Engineering and Design, 85(7-9), p.1190 - 1195, 2010/12

 Times Cited Count:1 Percentile:11(Nuclear Science & Technology)

Several R&Ds for the ITER blanket remote handling system had been performed from the Engineering Design Activity phase until now and only several technical issues regarding the control system remained such as noise caused by slip ring, control of cable handling system, signal transmission through very long cable and radiation-hard amplifier. This study concentrates on these issues. As a conclusion, major issues for the control system have been solved and the ITER blanket remote handling system becomes further feasible.

JAEA Reports

Evaluation method of pH elevation due to reaction between hydrates of ordinary Portland cement and saline groundwater

Masuda, Kenta; Oda, Chie; Nakanishi, Hiroshi*; Sasaki, Ryoichi*; Takase, Toshio*; Akagi, Yosuke*; Fujita, Hideki*; Negishi, Kumi*; Honda, Akira

JAEA-Research 2008-104, 194 Pages, 2009/03

JAEA-Research-2008-104.pdf:9.43MB

Saline groundwater contains high concentrations of chloride ions, which possibly elevate the pH of cement pore water by reacting with hydrogarnet and producing Friedel's salt. Calcium aluminate hydrates and portlandite, which can be found in hydrated ordinary Portland cement (OPC), were immersed in a sodium chloride solution, which had concentrations similar to those found in seawater.

Journal Articles

Modeling of pH elevation due to the reaction of saline groundwater with hydrated ordinary Portland cement phases

Honda, Akira; Masuda, Kenta; Nakanishi, Hiroshi*; Fujita, Hideki*; Negishi, Kumi*

Materials Research Society Symposium Proceedings, Vol.1124, p.365 - 372, 2009/00

Journal Articles

Effects of locally targeted heavy-ion and laser microbeam on root hydrotropism in ${it Arabidopsis thaliana}$

Miyazawa, Yutaka*; Sakashita, Tetsuya; Funayama, Tomoo; Hamada, Nobuyuki*; Negishi, Hiroshi*; Kobayashi, Akie*; Kaneyasu, Tomoko*; Oba, Atsushi*; Morohashi, Keita*; Kakizaki, Takehiko*; et al.

Journal of Radiation Research, 49(4), p.373 - 379, 2008/07

 Times Cited Count:24 Percentile:62.01(Biology)

We examined the role of root cap and elongation zone cells in root hydrotropism using heavy-ion and laser microbeam. Heavy-ion microbeam irradiation of the elongation zone, but not that of the columella cells, significantly and temporary suppressed the development of hydrotropic curvature. However, laser ablation confirmed that columella cells are indispensable for hydrotropism. Systemic heavy-ion broad-beam irradiation suppressed ${it de novo}$ expression of ${it INDOLE ACETIC ACID 5}$ gene, but not ${it MIZU-KUSSEI1}$ gene. Our results indicate that both the root cap and elongation zone have indispensable and functionally distinct roles in root hydrotropism, and that ${it de novo}$ gene expression might be required for hydrotropism in the elongation zone, but not in columella cells.

Journal Articles

Functional analysis of root elongation zone in hydrotropism in ${it Arabidopsis}$ using heavy-ion microbeam

Miyazawa, Yutaka*; Sakashita, Tetsuya; Negishi, Hiroshi*; Kobayashi, Akie*; Kaneyasu, Tomoko*; Oba, Atsushi*; Morohashi, Keita*; Kakizaki, Takehiko*; Funayama, Tomoo; Hamada, Nobuyuki*; et al.

JAEA-Review 2007-060, JAEA Takasaki Annual Report 2006, P. 116, 2008/03

We examined the role of root cap and elongation zone cells in root hydrotropism of ${it Arabidopsis thaliana}$ using heavy ion and laser microbeam. Heavy ion microbeam irradiation of the elongation zone, but not that of the columella cells, significantly and temporarily suppressed the development of hydrotropic curvature. However, laser ablation confirmed that columella cells are indispensable for hydrotropism. Systemic heavy ion broad beam irradiation suppressed de novo expression of INDOLE ACETIC ACID 5 gene. Our results indicate that both the root cap and elongation zone have indispensable and functionally distinct roles in root hydrotropism, and that de novo gene expression might be required for hydrotropism in the elongation zone, but not in columella cells.

Journal Articles

Identification of the functional tissues for hydrotropism in comparison with those for gravitropism

Miyazawa, Yutaka*; Negishi, Hiroshi*; Sakashita, Tetsuya; Kobayashi, Akie*; Kaneyasu, Tomoko*; Oba, Atsushi*; Funayama, Tomoo; Wada, Seiichi*; Hamada, Nobuyuki*; Kakizaki, Takehiko; et al.

JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 119, 2007/02

Journal Articles

Experimental study on long-term safety assessment considering uncertainties for geological disposal of radioactive wastes; JAERI status at 2005

Yamaguchi, Tetsuji; Sakamoto, Yoshifumi; Iida, Yoshihisa; Negishi, Kumi; Taki, Hiroshi; Akai, Masanobu; Jinno, Fumika; Kimura, Yuichiro; Ueda, Masato; Tanaka, Tadao; et al.

Proceedings of International Conference on Nuclear Energy System for Future Generation and Global Sustainability (GLOBAL 2005) (CD-ROM), 6 Pages, 2005/10

no abstracts in English

Journal Articles

Data acquisition on migration of radionuclides under deep geological environments

Iida, Yoshihisa; Taki, Hiroshi; Yamaguchi, Tetsuji; Tanaka, Tadao; Negishi, Kumi; Nakayama, Shinichi

JAERI-Conf 2005-007, p.230 - 235, 2005/08

A variation in data should be quantitatively incorporated in a probabilistic safety assessment of radioactive waste disposal. We focus our experimental efforts on parameters that induce major uncertainties in the radionuclide migration analysis and that have not been quantitatively assessed. Possible sources of uncertainty includes increase in ionic strength of groundwater caused by intrusion of seawater and/or dissolution of sodium nitrate in TRU waste, highly alkaline conditions originating from cementitious materials, and a variation of porewater composition accompanied with corrosion of. This study is a summary of current status of our investigations for solubility and diffusion.

Journal Articles

Magnetic circular dichroism in the soft X-ray absorption spectra of intercalation compounds Fe$$_{x}$$TiS$$_{2}$$

Yamasaki, Atsushi*; Imada, Shin*; Utsunomiya, Hiroshi*; Muro, Takayuki*; Saito, Yuji; Negishi, H.*; Sasaki, M.*; Inoue, M.*; Suga, Shigemasa*

Physica E, 10(1-3), p.387 - 390, 2001/05

 Times Cited Count:5 Percentile:33.67(Nanoscience & Nanotechnology)

no abstracts in English

Oral presentation

Identification of the functional tissues for hydrotropism and gravitropism; Comparative study using heavy ion and laser microbeams

Negishi, Hiroshi*; Miyazawa, Yutaka*; Sakashita, Tetsuya; Kobayashi, Akie*; Kaneyasu, Tomoko*; Oba, Atsushi*; Funayama, Tomoo; Wada, Seiichi; Hamada, Nobuyuki; Kakizaki, Takehiko; et al.

no journal, , 

no abstracts in English

Oral presentation

Identification of the functional tissues for hydrotropism in comparison with those for gravitropism

Negishi, Hiroshi*; Miyazawa, Yutaka*; Sakashita, Tetsuya; Kobayashi, Akie*; Kaneyasu, Tomoko*; Oba, Atsushi*; Funayama, Tomoo; Wada, Seiichi; Hamada, Nobuyuki; Kakizaki, Takehiko; et al.

no journal, , 

no abstracts in English

Oral presentation

Investigation of pH elevation caused by reaction between cement hydrates and saline water

Nakanishi, Hiroshi; Honda, Akira; Oda, Chie; Sasaki, Ryoichi; Fujita, Hideki*; Negishi, Kumi*; Takase, Toshio*; Akagi, Yosuke*

no journal, , 

no abstracts in English

Oral presentation

Experimental research for long term evaluation on radioactive waste disposal; Progress in 2006

Tanaka, Tadao; Yamaguchi, Tetsuji; Iida, Yoshihisa; Kimura, Yuichiro; Taki, Hiroshi; Fujiwara, Takeshi; Ueda, Masato*; Mukai, Masayuki; Yamada, Fumika; Mizuno, Tsuyoshi; et al.

no journal, , 

no abstracts in English

Oral presentation

Mapping of arabidopsis root cap cells that function in hydrotropic response using heavy-ion and laser microbeam irradiation

Miyazawa, Yutaka*; Negishi, Hiroshi*; Kobayashi, Akie*; Kaneyasu, Tomoko*; Oba, Atsushi*; Fujii, Nobuharu*; Takahashi, Hideyuki*; Sakashita, Tetsuya; Funayama, Tomoo; Wada, Seiichi*; et al.

no journal, , 

no abstracts in English

Oral presentation

Effects of heavy-ion and laser microbeam irradiation on root hydrotropism of ${it Arabidopsis thaliana}$

Miyazawa, Yutaka*; Sakashita, Tetsuya; Negishi, Hiroshi*; Kobayashi, Akie*; Oba, Atsushi*; Kaneyasu, Tomoko*; Morohashi, Keita*; Takahashi, Akiko*; Kakizaki, Takehiko*; Funayama, Tomoo; et al.

no journal, , 

We examined the function of root cap and elongation zone cells in root hydrotropism by nondestructive cell inactivation using heavy-ion microbeam irradiation. Systemic heavy-ion irradiation inactivated de novo indole acetic acid 5 gene expression. Local irradiation of the elongation zone significantly suppressed the development of hydrotropic curvature, whereas local irradiation of the columella cells did not. However, laser ablation confirmed that columella cells are indispensable for hydrotropism. Our results indicate that both the root cap and elongation zone have indispensable and functionally distinct roles in root hydrotropism, and that in the elongation zone, de novo gene expressions, including auxin-responsible gene expression, is required for hydrotropism, whereas in columella cells, it is not.

Oral presentation

Tribological proof test results of Diamond Like Carbon (DLC) film to lubricate the mechanical gear for ITER remote handling equipment under GPa level high contact stress

Kakudate, Satoshi; Takeda, Nobukazu; Nakahira, Masataka*; Aburadani, Atsushi; Matsumoto, Yasuhiro; Kozaka, Hiroshi; Negishi, Yusuke

no journal, , 

no abstracts in English

Oral presentation

Verification test of rail connection mechanism for ITER blanket remote handling system

Kozaka, Hiroshi; Takeda, Nobukazu; Aburadani, Atsushi; Matsumoto, Yasuhiro; Negishi, Yusuke; Kakudate, Satoshi

no journal, , 

no abstracts in English

Oral presentation

Installation and removal of ITER blanket module using torque limiting control

Aburadani, Atsushi; Takeda, Nobukazu; Matsumoto, Yasuhiro; Kozaka, Hiroshi; Negishi, Yusuke; Kakudate, Satoshi

no journal, , 

no abstracts in English

Oral presentation

Remote handling of large and heavy component for ITER maintenance

Shigematsu, Soichiro; Aburadani, Atsushi; Takeda, Nobukazu; Kozaka, Hiroshi; Negishi, Yusuke; Kakudate, Satoshi

no journal, , 

no abstracts in English

23 (Records 1-20 displayed on this page)