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Journal Articles

Hydrogen absorption mechanism into iron in aqueous solution including metal cations by laser ablation tests and first-principles calculations

Igarashi, Takahiro; Otani, Kyohei; Kato, Chiaki; Sakairi, Masatoshi*; Togashi, Yusuke*; Baba, Kazuhiko*; Takagi, Shusaku*

ISIJ International, 61(4), p.1085 - 1090, 2021/04

 Times Cited Count:0 Percentile:8.46(Metallurgy & Metallurgical Engineering)

In order to clarify the effect of metal cations (Zn$$^{2+}$$, Mg$$^{2+}$$, Na$$^{+}$$) in aqueous solution on hydrogen permeation into iron, the amount of hydrogen permeation from iron surface was measured by electrochemical tests with a laser ablation. Moreover, in order to obtain the basic mechanism of hydrogen permeation with metal cation, first-principles calculations were used to acquire the adsorption potential of the metal cation and the electronic state around iron surface. By Zn$$^{2+}$$ in solution, anodic reaction on ablated surface by laser irradiation was suppressed. Also, by quantum analysis Zn atoms were chemically bonded stronger than Na and Mg atoms to iron surface. It was suggested that the dissolution reaction of iron was suppressed by the formation of the Zn layer, and that lead suppression of hydrogen permeation into iron.

Journal Articles

Analysis of bonding structure of ultrathin films of oligothiophene molecules grown on passivated silicon surfaces

Toyoshima, Hiroaki*; Hiraga, Kenta*; Ono, Shinya*; Tanaka, Masatoshi*; Ozawa, Kenichi*; Mase, Kazuhiko*; Hirao, Norie; Sekiguchi, Tetsuhiro; Shimoyama, Iwao; Baba, Yuji

Photon Factory Activity Report 2011, Part B, P. 102, 2012/00

The knowledge of the interaction between organic molecules and semiconductor surfaces plays an important role in adapting organic semiconductors into the semiconductor technology. In the present study, the process of $$alpha$$-sexithiophene ($$alpha$$-6T) thin layer formation on passivated silicon (Si) surfaces has been investigated in-situ by means of PES, angle-depended NEXAFS (near-edge X-ray absorption fine-structure), SDRS, and RDS. For water-adsorbed Si(001), it was found that the majority of $$alpha$$-6T molecules are standing on the substrate. Above 3 nm, most of molecules are standing and constitute well ordered islands or films. For ethylene adsorbed Si(001) on the contrary, some of $$alpha$$-6T molecules are flat-lying, resulting in less prominent orientation. Thus, the orientation of molecules depends on the method of passivation, which opens the possibility of controlling the molecular orientation by the surface modification.

JAEA Reports

The Approaches of safety design and safety evaluation at HTTR (High Temperature Engineering Test Reactor)

Iigaki, Kazuhiko; Saikusa, Akio; Sawahata, Hiroaki; Shinozaki, Masayuki; Tochio, Daisuke; Homma, Fumitaka; Tachibana, Yukio; Iyoku, Tatsuo; Kawasaki, Kozo; Baba, Osamu*

JAEA-Review 2006-010, 90 Pages, 2006/07

JAEA-Review-2006-010.pdf:5.65MB

Gas Cooled Reactor has long history of nuclear development, and High Temperature Gas Cooled Reactor (HTGR) has been expected that it can be supply high temperature energy to chemical industry and to power generation from the points of view of the safety, the efficiency, the environment and the economy. The HTGR design is tried to installed passive safety equipment. The current licensing review guideline was made for a Low Water Reactor (LWR) on safety evaluation therefore if it would be directly utilized in the HTGR it needs the special consideration for the HTGR. This paper describes that investigation result of the safety design and the safety evaluation traditions for the HTGR, comparison the safety design and safety evaluation feature for the HTGT with it's the LWR, and reflection for next HTGR based on HTTR operational experiment.

Journal Articles

Safety concept of severe accident free HTR and its demonstration by the HTTR

Kunitomi, Kazuhiko; Shiozawa, Shusaku; Baba, Osamu

Proc. of ASME$$cdot$$JSME 4th Int. Conf. on Nuclear Engineering 1996 (ICONE-4), 2, p.303 - 307, 1996/00

no abstracts in English

Journal Articles

Design and present status of high-temperature engineering test reactor

Baba, Osamu; Kunitomi, Kazuhiko; Kawaji, Satoshi; Tanaka, Toshiyuki; Shiozawa, Shusaku; Okubo, Minoru

Proc. of ASME$$cdot$$JSME 4th Int. Conf. on Nuclear Engineering 1996 (ICONE-4), 2, p.281 - 287, 1996/00

no abstracts in English

JAEA Reports

Design of High Temperature Engineering Test Reactor (HTTR)

Saito, Shinzo; Tanaka, Toshiyuki; Sudo, Yukio; Baba, Osamu; Shindo, Masami; Shiozawa, Shusaku; Mogi, Haruyoshi; Okubo, Minoru; Ito, Noboru; Shindo, Ryuichi; et al.

JAERI 1332, 247 Pages, 1994/09

JAERI-1332.pdf:11.53MB

no abstracts in English

Journal Articles

The Three-dimensional thermal analysis for the stand-pipe room of HTTR by the STREAM code

Takeda, Takeshi; Kunitomi, Kazuhiko; Baba, Osamu

Proc. 6th Int. Topical Meeting on Nuclear Reactor Thermal Hydraulics,Vol. 1; NURETH6, 0, p.1483 - 1488, 1994/00

no abstracts in English

JAEA Reports

Stress and strain evaluation of the heat transfer tubes in the intermediate heat exchanger for the HTTR

Kunitomi, Kazuhiko; Shinozaki, Masayuki; ; Okubo, Minoru; Baba, Osamu; *; Otani, Akihito*

JAERI-M 92-147, 77 Pages, 1992/10

JAERI-M-92-147.pdf:1.77MB

no abstracts in English

JAEA Reports

Developments of high-temperature Structural design rules for the HTTR class 1 boltings and core-restraint-bands

Motoki, Yasuo; Hada, Kazuhiko; *; Baba, Osamu

JAERI-M 91-056, 44 Pages, 1991/03

JAERI-M-91-056.pdf:1.68MB

no abstracts in English

Journal Articles

Application of new design methodologies to very high-temperature metallic components of the HTTR

Hada, Kazuhiko; Okubo, Minoru; Baba, Osamu

Nucl. Eng. Des., 132, p.13 - 21, 1991/00

 Times Cited Count:1 Percentile:19.93(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Development of methods for generating design allowable limits for the HTTR high-temperature structural design code

Hada, Kazuhiko; Motoki, Yasuo; Baba, Osamu

JAERI-M 90-148, 231 Pages, 1990/09

JAERI-M-90-148.pdf:3.85MB

no abstracts in English

Journal Articles

Structural integrity evaluation of a helically-coiled He/He intermediate heat exchanger

Okubo, Minoru; Hada, Kazuhiko; Baba, Osamu

High Temperature Metallic Materials for Gas-Cooled Reactors, p.42 - 49, 1989/00

no abstracts in English

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