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Journal Articles

NH$$_4$$$$^+$$ generation; The Role of NO$$_3$$$$^-$$ in the crevice corrosion repassivation of type 316L stainless steel

Aoyama, Takahito; Sugawara, Yu*; Muto, Izumi*; Hara, Nobuyoshi*

Journal of the Electrochemical Society, 166(10), p.C250 - C260, 2019/01

 Times Cited Count:2 Percentile:13.91(Electrochemistry)

The role of NO$$_3$$$$^-$$ in the repassivation of crevice corrosion of Type 316L stainless steel was investigated. In crevice corrosion tests, the solution was changed from 1 M NaCl to NaCl-NaNO$$_3$$. NO$$_3$$$$^-$$ led to complete repassivation. Repassivation of the crevice corrosion was found to take place in two steps. In the first step, the estimated current density inside the crevice gradually decreased from ca. 5 mA cm$$^{-2}$$ to ca. 5 $$mu$$A cm$$^{-2}$$. After that, the current density suddenly decreased to less than 0.1 $$mu$$A cm$$^{-2}$$. From the potentiodynamic polarization in acidic solutions simulated inside the crevice (pH 0.2) and in situ observations of the crevice corrosion morphology, the first step was thought to be generated by the suppression of active dissolution by NO$$_3$$$$^{-}$$. It would appear that the generation of NH$$_{4}^{+}$$ results in a pH increase and the further suppression of active dissolution, and then repassivation occurs.

Journal Articles

Development of high-grade VPS-tungsten coatings on F82H reduced activation steel

Tokunaga, Tomonori*; Watanabe, Hideo*; Yoshida, Naoaki*; Nagasaka, Takuya*; Kasada, Ryuta*; Lee, Y.-J.*; Kimura, Akihiko*; Tokitani, Masayuki*; Mitsuhara, Masatoshi*; Hinoki, Tatsuya*; et al.

Journal of Nuclear Materials, 442(1-3), p.S287 - S291, 2013/11

 Times Cited Count:6 Percentile:49.64(Materials Science, Multidisciplinary)

Journal Articles

Report on ITPA (International Tokamak Physics Activity) meeting, 22

Takenaga, Hidenobu; Ogawa, Yuichi*; Takizuka, Tomonori; Yagi, Masatoshi*; Yamada, Hiroshi*; Sakamoto, Yoshiteru; Toi, Kazuo*; Fukuda, Takeshi*; Fukuyama, Atsushi*; Fujita, Takaaki; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 84(7), p.465 - 467, 2008/07

no abstracts in English

Journal Articles

Report on ITPA (International Tokamak Physics Activity) meeting, 20

Fujita, Takaaki; Fukuda, Takeshi*; Fukuyama, Atsushi*; Sakamoto, Yoshiteru; Toi, Kazuo*; Ogawa, Yuichi*; Takenaga, Hidenobu; Takizuka, Tomonori; Yagi, Masatoshi*; Yamada, Hiroshi*; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 84(1), p.70 - 72, 2008/01

no abstracts in English

Journal Articles

Report of meetings of ITPA (International Tokamak Physics Activity), 19

Sasao, Mamiko*; Kusama, Yoshinori; Kawano, Yasunori; Kawahata, Kazuo*; Mase, Atsushi*; Sugie, Tatsuo; Fujita, Takaaki; Fukuda, Takeshi*; Fukuyama, Atsushi*; Sakamoto, Yoshiteru; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 83(9), p.779 - 782, 2007/09

This is a report of highlights from 2007 spring meetings of seven Topical Groups (TG) of International Tokamak Physics Activity (ITPA). In each meeting, high priority issues in physics of International Thermonuclear Experimental Reactor (ITER) and other burning plasma experiments have been discussed and investigated. Twenty-seven scientists from Japan have participated in those meetings. Dates and places of the meetings are shown below. (1) Diagnostics TG: 26-30 March, Princeton (USA), (2) Transport Physics TG: 7-10 May, Lausanne (Switzerland), (3) Confinement Database and Modeling TG: 7-10 May, Lausanne (Switzerland), (4) Edge Pedestal Physics TG: 7-10 May, Garching (Germany) (5) Steady State Operation TG: 9-11 May, Daejeon (South Korea), (6)MHD TG: 21-24 May, San Diego (USA), (7) Scrape-off-layer and Divertor Physics TG: 7-10 May, Garching (Germany).

Journal Articles

Report on ITPA (International Tokamak Physics Activity) meeting, 18

Kawahata, Kazuo*; Kawano, Yasunori; Kusama, Yoshinori; Mase, Atsushi*; Sasao, Mamiko*; Sugie, Tatsuo; Fujita, Takaaki; Fukuda, Takeshi*; Fukuyama, Atsushi*; Sakamoto, Yoshiteru; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 83(2), p.195 - 198, 2007/02

no abstracts in English

Journal Articles

Low-density tin targets for efficient extreme ultraviolet light emission from laser-produced plasmas

Okuno, Tomoharu*; Fujioka, Shinsuke*; Nishimura, Hiroaki*; Tao, Y.*; Nagai, Keiji*; Gu, Q.*; Ueda, Nobuyoshi*; Ando, Tsuyoshi*; Nishihara, Katsunobu*; Norimatsu, Takayoshi*; et al.

Applied Physics Letters, 88(16), p.161501_1 - 161501_3, 2006/04

 Times Cited Count:63 Percentile:88.67(Physics, Applied)

no abstracts in English

Journal Articles

Opacity effect on extreme ultraviolet radiation from laser-produced tin plasmas

Fujioka, Shinsuke*; Nishimura, Hiroaki*; Nishihara, Katsunobu*; Sasaki, Akira; Sunahara, Atsushi*; Okuno, Tomoharu*; Ueda, Nobuyoshi*; Ando, Tsuyoshi*; Tao, Y.*; Shimada, Yoshinori*; et al.

Physical Review Letters, 95(23), p.235004_1 - 235004_4, 2005/12

 Times Cited Count:135 Percentile:95.53(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Comparison of electron internal transport barriers in the large helical device and JT-60U plasmas

Ida, Katsumi*; Fujita, Takaaki; Fukuda, Takeshi*; Sakamoto, Yoshiteru; Ide, Shunsuke; Toi, Kazuo*; Inagaki, Shigeru*; Shimozuma, Takashi*; Kubo, Shin*; Idei, Hiroshi*; et al.

Plasma Physics and Controlled Fusion, 46(5A), p.A45 - A50, 2004/05

 Times Cited Count:19 Percentile:55.85(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Understanding of the H mode pedestal characteristics using the multimachine pedestal database

Hatae, Takaki; Sugihara, Masayoshi; Hubbard, A. E.*; Igitkhanov, Y.*; Kamada, Yutaka; Janeschitz, G.*; Horton, L. D.*; Oyabu, Nobuyoshi*; Osborne, T. H.*; Osipenko, M.*; et al.

Nuclear Fusion, 41(3), p.285 - 293, 2001/03

 Times Cited Count:39 Percentile:75.89(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Deuterium pumping experiment with superpermeable Nb membrane in JFT-2M tokamak

Nakamura, Yukio*; Sengoku, Seio; Nakahara, Yukio*; Suzuki, Naoyuki*; Suzuki, Hajime*; Oyabu, Nobuyoshi*; Busnyuk, A.*; Notkin, M.*; Livshits, A.*

Journal of Nuclear Materials, 278(2-3), p.312 - 319, 2000/04

 Times Cited Count:9 Percentile:55.69(Materials Science, Multidisciplinary)

no abstracts in English

Oral presentation

Development of the Integrated System for Repository Engineering (iSRE), 4; Current status of the prototype of the iSRE

Yoshino, Hiroyuki*; Fujisawa, Yasuo*; Kobayashi, Yuichi*; Sugita, Yutaka; Kageyama, Takeshi; Hane, Koji*; Sahara, Fumihiro*; Yabuki, Nobuyoshi*; Makanae, Koji*

no journal, , 

This paper reports development of ISRE (the Integrated System for Repository Engineering), as a knowledge management tool on the repository design and engineering technology, which manages and inherits the information and knowledge of each phase of the disposal project of the radioactive waste during around 100 years, which also enables reasonable design of the repository by using accumulated and integrated information. Content of this paper is current status of the prototype of the iSRE.

Oral presentation

Development of the Integrated System for Repository Engineering (iSRE), 5; Utilization of the protype of the iSRE

Hane, Koji*; Sahara, Fumihiro*; Sugita, Yutaka; Kageyama, Takeshi; Fujisawa, Yasuo*; Yoshino, Hiroyuki*; Kobayashi, Yuichi*; Yabuki, Nobuyoshi*; Makanae, Koji*

no journal, , 

This paper reports development of ISRE (the Integrated System for Repository Engineering), as a knowledge management tool on the repository design and engineering technology, which manages and inherits the information and knowledge of each phase of the disposal project of the radioactive waste during around 100 years, which also enables reasonable design of the repository by using accumulated and integrated information. Content of this paper is outline of trial utilization of the prototype of the iSRE and the extracted issues.

Oral presentation

Development of multi-level, multi-scenario simulation systems for sodium cooled fast reactor, 4; Experimental database construction for code V&V

Kikuchi, Shin; Kurihara, Akikazu; Koga, Nobuyoshi*; Deguchi, Yoshihiro*; Takata, Takashi; Ohshima, Hiroyuki

no journal, , 

Development of multi-level, multi-scenario simulation systems for the safety fundamental technology of sodium cooled fast reactor is under way. In this study, authours report the experimental plan and current status on sodium fire and sodium-concrete reaction as important specific events of sodium cooled fast reactor for code V&V.

Oral presentation

Development of the Integrated System for Repository Engineering (iSRE), 6; Expansion of function for practical use of the iSRE

Numata, Taro*; Fujisawa, Yasuo*; Kobayashi, Yuichi*; Sugita, Yutaka; Kageyama, Takeshi; Hane, Koji*; Sahara, Fumihiro*; Yabuki, Nobuyoshi*; Makanae, Koji*

no journal, , 

This paper reports development of ISRE (the Integrated System for Repository Engineering), as a knowledge management tool on the repository design and engineering technology, which manages and inherits the information and knowledge of each phase of the disposal project of the radioactive waste during around 100 years, which also enables reasonable design of the repository by using accumulated and integrated information. Content of this paper is expansion of function for practical use of the iSRE.

Oral presentation

Development of the Integrated System for Repository Engineering (iSRE), 7; Utilization of for practical use of prototype of the iSRE

Hane, Koji*; Sahara, Fumihiro*; Sugita, Yutaka; Kageyama, Takeshi; Fujisawa, Yasuo*; Numata, Taro*; Kobayashi, Yuichi*; Yabuki, Nobuyoshi*; Makanae, Koji*

no journal, , 

This paper reports development of ISRE (the Integrated System for Repository Engineering), as a knowledge management tool on the repository design and engineering technology, which manages and inherits the information and knowledge of each phase of the disposal project of the radioactive waste during around 100 years, which also enables reasonable design of the repository by using accumulated and integrated information. Content of this paper is outline of trial utilization of prototype of the iSRE and the extracted issues for practical system.

Oral presentation

Development of multi-level, multi-scenario simulation systems for sodium cooled fast reactor, 9; Fundamental experiment on sodium-concrete reaction

Kikuchi, Shin; Koga, Nobuyoshi*; Kurihara, Akikazu; Takata, Takashi; Ohshima, Hiroyuki

no journal, , 

Development of multi-level, multi-scenario simulation systems for the safety fundamental technology of sodium cooled fast reactor is under way. In this study, authors report the experimental results on sodium-concrete reaction as important specific events of sodium cooled fast reactor for code V&V.

Oral presentation

Development of multi-level, multi-scenario simulation systems for sodium cooled fast reactor, 12-2; Fundamental experiment on sodium-concrete reaction

Kikuchi, Shin; Koga, Nobuyoshi*; Kurihara, Akikazu; Takata, Takashi; Ohshima, Hiroyuki

no journal, , 

Development of multi-level, multi-scenario simulation systems for the safety fundamental technology of sodium cooled fast reactor is under way. In this study, authors report the experimental results and analysis on sodium-concrete reaction as important specific events of sodium cooled fast reactor for code V&V.

Oral presentation

Development of multi-level, multi-scenario simulation systems for sodium cooled fast reactor, 17; Reaction behavior evaluation based on fundamental experiments for sodium-concrete reaction

Kikuchi, Shin; Koga, Nobuyoshi*; Kurihara, Akikazu; Takata, Takashi; Ohshima, Hiroyuki

no journal, , 

Multi-level, multi-scenario simulation systems as safety fundamental technology for sodium cooled fast reactors (SFRs) has been developed. In this report, the reaction behavior evaluation based on the fundamental experiments for sodium-concrete reaction as specific safety issue of SFR for V&V is presented.

19 (Records 1-19 displayed on this page)
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