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Journal Articles

Routing study of above core structure with mock-up experiment for ASTRID

Takano, Kazuya; Sakamoto, Yoshihiko; Morohoshi, Kyoichi*; Okazaki, Hitoshi*; Gima, Hiromichi*; Teramae, Takuma*; Ikarimoto, Iwao*; Botte, F.*; Dirat, J.-F.*; Dechelette, F.*

Proceedings of 2019 International Congress on Advances in Nuclear Power Plants (ICAPP 2019) (Internet), 8 Pages, 2019/05

ASTRID has the objective to integrate innovative options in order to prepare the 4th generation reactors. In ASTRID, large number of tubes are installed above each fuel subassembly to monitor the core. These instrumentations such as thermocouples (TC) and Failed Fuel Detection and Location (FFDL) systems are integrated into Above Core Structure (ACS) with various sizes tubes. In the present study, the routing study for TC tubes and FFDL tubes was performed with 3D modeling and mock-up experiment of the ACS designed for ASTRID with 1500 MW thermal power in order to clarify the integration process and secure the design hypotheses. Although some problems on fabricability were found in the mock-up experiment, the possible solutions were proposed. The present study gives manufacturing feedback to design team and will contribute to increase the knowledge for ACS design and fabricability.

Journal Articles

Electronic structure of BaFeO$$_{3}$$ studied by X-ray spectroscopy

Mizumaki, Masaichiro*; Fujii, Hitoshi*; Yoshii, Kenji; Hayashi, Naoaki*; Saito, Takashi*; Shimakawa, Yuichi*; Uozumi, Takayuki*; Takano, Mikio*

Physica Status Solidi (C), 12(6), p.818 - 821, 2015/06

 Times Cited Count:10 Percentile:94.66

We investigated the electronic structure of BaFeO$$_{3}$$ by using HAXPES and XAS measurements and first principle studies. The experimental and theoretical results indicated that BaFeO$$_{3}$$ is a negative charge transfer compound. We concluded that the on-site Coulomb energy and the strong hybridization between Fe-3d and O-2p orbitals play a very important role of emergence of negative charge transfer. And we found the new structure in the Fe-2p XPS spectrum and concluded this structure is originated from non-local screening.

JAEA Reports

None

Takano, Hitoshi*; Kimura, Hitoshi*

JNC TJ7440 2005-090, 210 Pages, 2004/03

JNC-TJ7440-2005-090.PDF:8.35MB

no abstracts in English

JAEA Reports

None

Takano, Hitoshi*; Kimura, Hitoshi*

JNC TJ7440 2005-089, 35 Pages, 2004/03

JNC-TJ7440-2005-089.PDF:1.02MB

no abstracts in English

JAEA Reports

Stability investigation of the foundation around mill tailing yard

Hasegawa, Osanu*; Takano, Hitoshi*

JNC TJ6420 2004-001, 50 Pages, 2004/02

JNC-TJ6420-2004-001.pdf:1.61MB

In order to evaluate the possibility of slope failure and landsliding, aerial photograph interpretation has been carried out around mill tailing and waste rock yards.Almost of small-scale slope failure features are recognized in steep slope area (over 20$$^{circ}$$ dip), in which Cretaceous granitic rocks and Tertiary volcanic rocks are distributed. Furthermore small-scale slope failure features are also recognized in artificially deforested area. Therefore it seems that many factors are related to occurrence of slope failure.Landslide features are recognized at 2 localities in the distribution of Tertiary stratified volcanic rocks. The landslide may be closely related to the geological setting. In addition, these slope failure and landslide topographic features have no relation to lineament or active fault. Mill tailing and waste rock yards are especially located in gently slope area (under 20$$^{circ}$$ dip). It is suggested that these yards are topographically on stable landform. Although, there exist steep gradient slopes (over 20$$^{circ}$$ dip) at upward of Choja and Kannokura waste rock yards. And slope failure features are recognized around these yards. Therefore it may be inferred that slope failure will take place there.

JAEA Reports

Geological Structure Modeling Around Mill Tailing Yard

Takano, Hitoshi*; Sugimoto, Yoshihiro*; Yamashita, Tadashi*; Yamada, Naoyuki*

JNC TJ6420 2003-011, 127 Pages, 2003/02

JNC-TJ6420-2003-011.pdf:4.56MB

Drilling and high resolution electrical survey was carried out to make a geological structure model around mill tailing yard. Following by drill investigation, Distribution of the granite which became fragility was confirmed by the development of fractures with hydrothermal vein. However, fresh bedrock is distributed deeper than 40m. Permeability of weathering granite is about in 1.15$$times$$10$$^{-6}$$m/sec. The value agrees previous findings. In fresh granite, permeability is 4.33$$times$$10$$^{-7}$$m/sec, and it value is larger than existing data. It is for developing of fractures in fresh granite. At high resolution electrical survey, analysis is done by 3 dimensions. By analyzing it with 3 dimensions, good resistivity distribution was provided. From resistivity distribution, tailing, weathered granite or sedimentary rock and fresh granite are classified. Resistivity distribution was taken out from lines or seismic exploration refraction method, and compared between two methods. As a result, low resistivity region is fitted low velocity zone and high resistivity region is fitted high velocity zone. Topography and 4 geological models are created. These models are output as versatile text data to show relation of a coordinate and the point of contact.

JAEA Reports

JNDC nuclear data library of fission products; Second version

Tasaka, Kanji; Katakura, Junichi; Ihara, Hitoshi; Yoshida, Tadashi*; Iijima, Shungo*; Nakashima, Ryuzo*; Nakagawa, Tsuneo; Takano, Hideki

JAERI 1320, 253 Pages, 1990/09

JAERI-1320.pdf:10.61MB

no abstracts in English

Journal Articles

Japanese evaluated nuclear data library, JENDL-3

Asami, Tetsuo*; Iijima, Shungo*; ; Ihara, Hitoshi; Kawai, Masayoshi*; ; Komuro, Yuichi; Shibata, Keiichi; Takano, Hideki; *; et al.

Nihon Genshiryoku Gakkai-Shi, 31(11), p.1190 - 1217, 1989/11

no abstracts in English

JAEA Reports

Natural Analogue Study of Volcanic Glass; A Case Study of Basaltic Glasses in Pyroclastic Fall Deposits of Fuji Volcano, Japan

Arai, Takashi; Yusa, Yasuhisa; Sasaki, Noriaki; Tsunoda, Naomi; Takano, Hitoshi*

PNC TN8410 89-010, 17 Pages, 1989/02

PNC-TN8410-89-010.pdf:0.85MB

A considerable range in alteration rates of basaltic glasses in various environments has been reported in previous studies. However, these studies paid only cursory attention to the environmental conditions under which the glass had been altered. In this study, the alteration of basaltic glasses was investigated and the environmental conditions and the alteration rate were discussed. Two sample ages were represented: 280 years and 2800 years. Basaltic glasses and their alteration layers were analyzed by electron probe microanalyzer (EMPA) and the thickness of the alteration layers were measured by scanning electron microscope (SEM). The ground water collected near the sampling point of Zunazawa Scoria (2800 years) and the pore water of both samples were analyzed. The alteration temperature and flow rate of water are estimated to be about 13$$^{circ}$$C and 0.2 l/m$$^{2}$$/y respectively on the basis of meteorological data. The alteration layers of young aged basaltic glasses in freshwater conditions are similar to those of leached borosilicate glasses. The alteration rates of these basaltic glasses are estimated to be several $$mu$$m/1000y. The elemental concentrations in the ground water can be roughly explained as the result of leaching of the glasses.

JAEA Reports

A Study on the characteristics of the weathering of natural glass from Japan

Takano, Hitoshi*; Sakuramoto, Yuji*; Okazaki, Kazuhiko*

JNC TJ1400 2005-013, 132 Pages, 1987/06

JNC-TJ1400-2005-013.pdf:8.43MB

The literature investigation and field survey done to get basic data to clarify the weathering characterristics of natureal glass from Japan as a study on geological disposal of highly radioactive waste.

Oral presentation

Development of simplified pellet fuel production technology, 6; Sintering and O/M ratio adjustment technology

Takano, Tatsuo; Kobayashi, Hitoshi; Suzuki, Yuichiro*; Haga, Tetsuya; Takeuchi, Kentaro; Kashimura, Motoaki; Suzuki, Masahiro; Kihara, Yoshiyuki

no journal, , 

no abstracts in English

Oral presentation

Dynamic and static structure factors for random copolymers

Endo, Hitoshi; Takano, Atsushi*

no journal, , 

no abstracts in English

Oral presentation

Dynamic structure factor for random copolymers investigated by neutron spin echo

Endo, Hitoshi; Takano, Atsushi*

no journal, , 

To study dynamics of polymers on the molecular level, it is necessary to perform experiments in the wide spatiotemporal scale. Neutron spin echo (NSE) technique allows us to access the time scale from sub-nanosecond to sub-microsecond with the length scale from sub-nanometer to sub-micrometer with relatively little efforts. Another important feature of the neutron scattering is deuterium labeling, i.e., with neutrons as probe, contrast variation techniques based on hydrogen/deuterium replacement can be used to modify the visibility of different component in the system. In this study, the dynamic structure factors of a linear random block copolymer with deuterated and protonated monomers were measured by NSE quantitatively, and were compared with those of the fully protonated polymer with the same polymerization degree. The observed dynamic structure factors have confirmed the high measurement accuracy of the NSE spectrometer in Japan.

Oral presentation

Dynamic structure factor for random block copolymer investigated by neutron spin echo technique

Endo, Hitoshi; Takano, Atsushi*

no journal, , 

The dynamic structure factor of random copolymer was investigated by neutron spin echo technique. The theoretical dynamic structure for random copolymer was derived theoretically, which was deviated from that of homo polymer. Our experimental results supported this theoretical prediction. Furthermore, it became apparent that the theory based on Gaussian approximation violated gradually from large to small space.

Oral presentation

Mach-Zehnder type thermo-optic switch fabricated by proton beam writing

Ozawa, Yusuke*; Kubota, Hitoshi*; Miura, Kenta*; Hanaizumi, Osamu*; Noguchi, Katsuya*; Sato, Takahiro; Ishii, Yasuyuki; Koka, Masashi; Takano, Katsuyoshi*; Okubo, Takeru; et al.

no journal, , 

Oral presentation

Development of treatment for low radioactive effluent in Tokai Reprocessing Plant, 14; Study of Cs/Sr adsorption process by two linked column experiment

Takano, Masato; Ito, Yoshiyuki; Suzuki, Tatsuya*; Takimoto, Mayumi*; Matsukura, Minoru*; Mimura, Hitoshi*; Mori, Koichi*; Iwasaki, Mamoru*

no journal, , 

no abstracts in English

Oral presentation

Improvement of signal strength on primary heat transport system flow rate in pool type SFR

Takano, Kazuya; Kato, Atsushi; Uchita, Masato*; Okazaki, Hitoshi*; Ikari, Risako*

no journal, , 

Primary Heat Transport System (PHTS) flow rate is the most promising signal to detect the pump/diagrid link rupture in pool type SFR. The electromagnetic flowmeter is considered to measure the PHTS flow rate and is designed to install nearby outlet of the PHTS circulation pump in the current design of pool-type SFR with 600 MWe. The flowmeter could be significantly affected by the noise from pump motor. In order to improve the signal strength, the structure of flowmeter is drastically modified with the D-shape yokes and the magnetic circuits above and below an electrode.

17 (Records 1-17 displayed on this page)
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