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Journal Articles

Evaluation of tritium confinement performance of alumina and zirconium for tritium production in a high-temperature gas-cooled reactor for fusion reactors

Katayama, Kazunari*; Ushida, Hiroki*; Matsuura, Hideaki*; Fukada, Satoshi*; Goto, Minoru; Nakagawa, Shigeaki

Fusion Science and Technology, 68(3), p.662 - 668, 2015/10

https://doi.org/10.13182/FST14-968
 Times Cited Count：18 Percentile：79.30(Nuclear Science & Technology)

Tritium production utilizing nuclear reactions by neutron and lithium in a high-temperature gas-cooled reactor is attractive for development of a fusion reactor. From viewpoints of tritium safety and production efficiency, tritium confinement technique is an important issue. It is known that alumina has high resistance for gas permeation. In this study, hydrogen permeation experiments in commercial alumina tubes were conducted and hydrogen permeability, diffusivity and solubility was evaluated. By using obtained data, tritium permeation behavior from an Al$$_{2}$$O$$_{3}$$-coated Li-compound particle was simulated. Additionally, by using literature data for hydrogen behavior in zirconium, an effect of Zr incorporation into an Al$$_{2}$$O$$_{3}$$ coating on tritium permeation was discussed. It was indicated that the majority of produced tritium was released through the Al$$_{2}$$O$$_{3}$$ coating above 500$$^{circ}$$C. However, it is expected that total tritium leak is suppressed to below 0.67% of total tritium produced at 500$$^{circ}$$C by incorporating Zr fine particles into the inside of Al$$_{2}$$O$$_{3}$$ coating.

Journal Articles

Electron spin resonance study on H$$_6$$$$^+$$, H$$_5$$D$$^+$$, H$$_4$$D$$_2$$$$^+$$, and H$$_2$$D$$_4$$$$^+$$ in solid parahydrogen

Kumagai, Jun*; Inagaki, Hiroki*; Kariya, Susumu*; Ushida, Takahiro*; Shimizu, Yuta*; Kumada, Takayuki

Journal of Chemical Physics, 127(2), p.024505_1 - 024505_13, 2007/07

https://doi.org/10.1063/1.2748046

We carried out an electron spin resonance (ESR) study on hydrogen ion radicals produced by radiolysis of solid parahydrogen. We newly observed totally more than fifty resolved lines in irradiated solid parahydrogens. We assigned these lines to be isotope substituents of H$$_2$$$$^+$$-core H$$_6$$$$^+$$ ions such as H$$_5$$D$$^+$$, H$$_4$$D$$_2$$$$^+$$, and H$$_2$$D$$_4$$$$^+$$ throughout comparison of their ESR parameters with theoretical results. These results show conclusive evidence that H$$_2$$$$^+$$-core H$$_6$$$$^+$$ ions are produced and stably trapped in irradiated solid hydrogens. We also observed a lowering symmetry on electron wave function in H$$_5$$D$$^+$$ and H$$_4$$D$$_2$$$$^+$$, and isotope-substitution reactions such as H$$_6$$$$^+$$+D$$_2$$$$rightarrow $$H$$_4$$D$$_2$$$$^+$$+H$$_2$$ and H$$_6$$$$^+$$+HD$$rightarrow $$H$$_5$$D$$^+$$+H$$_2$$.

Oral presentation

Characteristics of DNA polymerase B in hyperthermophilic archaeon ${it Thermococcus kodakarensis}$

Kushida, Takushi*; Narumi, Issei; Fujiwara, Shinsuke*; Imanaka, Tadayuki*; Higashibata, Hiroki*

no journal, , 

no abstracts in English

Oral presentation

The Role of DNA polymerase B derived from a hyperthermophilic archaeon ${it Thermococcus kodakarensis}$ in DNA repair

Higashibata, Hiroki*; Kushida, Takushi*; Narumi, Issei; Imanaka, Tadayuki*; Fujiwara, Shinsuke*

no journal, , 

no abstracts in English

Oral presentation

DNA polymerase B is not essential for the cell growth of the hyperthermophilic archaeon ${it Thermococcus kodakarensis}$

Kushida, Takushi*; Kurauchi, Yasuyuki*; Narumi, Issei; Fujiwara, Shinsuke*; Imanaka, Tadayuki*; Higashibata, Hiroki*

no journal, , 

no abstracts in English

Oral presentation

Analysis of DNA damage stress sensitivity in the hyperthermophilic archaea ${it Thermococcus kodakarensis}$ DNA polymerase B gene disruptant

Kushida, Takushi*; Narumi, Issei; Fujiwara, Shinsuke*; Imanaka, Tadayuki*; Higashibata, Hiroki*

no journal, , 

no abstracts in English

Oral presentation

Characteristic of the DNA polymerase B disruptant of the hyperthermophilic archaeon ${it Thermococcus kodakaraensis}$

Kushida, Takushi*; Narumi, Issei; Fujiwara, Shinsuke*; Imanaka, Tadayuki*; Higashibata, Hiroki*

no journal, , 

no abstracts in English

Oral presentation

Phenotypic analysis of the DNA polymerase B disruptant of hyperthermophilic archaeon ${it Thermococcus kodatarensis}$

Kushida, Takushi*; Narumi, Issei; Fujiwara, Shinsuke*; Imanaka, Tadayuki*; Higashibata, Hiroki*

no journal, , 

no abstracts in English

Oral presentation

Sensitivity to DNA-damaging agents of PolB gene disruptant of the hyperthermophilic archaeon ${it Thermococcus kodakaraensis}$

Kurauchi, Yasuyuki*; Kushida, Takushi*; Narumi, Issei; Fujiwara, Shinsuke*; Imanaka, Tadayuki*; Higashibata, Hiroki*

no journal, , 

no abstracts in English

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