Study on hydrogen absorption in Zr powder used for tritium confinement in a production system of tritium for fusion reactors with a high-temperature gas-cooled reactor

J. Izumino, Kazunari Katayama, Hideaki Matsuura, Satoshi Fukada

研究成果: ジャーナルへの寄稿記事

抄録

A tritium production method using a high-temperature gas-cooled reactor loaded with lithium compound particles has been proposed for steadily starting up and stably operating a fusion reactor. In order to confine the produced tritium, small lithium-compound particles are considered to be coated by ceramic materials. The present authors have proposed adding zirconium fine particles into the inside of the ceramic coating to improve tritium confinement performance. In this work, powdered zirconium was exposed to hydrogen or deuterium gas in a closed volume at elevated temperatures and absorption rate constant and Sieverts' constant were evaluated by the pressure drop by absorption. After the experiments, it was found that the powdered zirconium sample became a lump by a sintering effect. By referring literature data for α-zirconium and its oxide, the observed absorption rate was speculated to include the influence of sintering and oxide layer. The obtained Sieverts’ constants were slightly smaller than literature data. By taking into account the observed hydrogen absorption behavior in powdered zirconium, tritium leak from alumina-coated lithium-compound particles containing zirconium fine particles was roughly estimated in some conditions. Tritium permeation rate can be reduced by adding zirconium but the leak suppression effect is limited.

元の言語英語
ページ(範囲)289-294
ページ数6
ジャーナルNuclear Materials and Energy
17
DOI
出版物ステータス出版済み - 12 1 2018

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high temperature gas cooled reactors
Plasma confinement
High temperature gas reactors
Tritium
fusion reactors
Fusion reactors
tritium
Zirconium
Powders
Hydrogen
Lithium Compounds
lithium compounds
Lithium compounds
hydrogen
sintering
Sintering
production engineering
ceramic coatings
Ceramic coatings
oxides

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Materials Science (miscellaneous)
  • Nuclear Energy and Engineering

これを引用

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abstract = "A tritium production method using a high-temperature gas-cooled reactor loaded with lithium compound particles has been proposed for steadily starting up and stably operating a fusion reactor. In order to confine the produced tritium, small lithium-compound particles are considered to be coated by ceramic materials. The present authors have proposed adding zirconium fine particles into the inside of the ceramic coating to improve tritium confinement performance. In this work, powdered zirconium was exposed to hydrogen or deuterium gas in a closed volume at elevated temperatures and absorption rate constant and Sieverts' constant were evaluated by the pressure drop by absorption. After the experiments, it was found that the powdered zirconium sample became a lump by a sintering effect. By referring literature data for α-zirconium and its oxide, the observed absorption rate was speculated to include the influence of sintering and oxide layer. The obtained Sieverts’ constants were slightly smaller than literature data. By taking into account the observed hydrogen absorption behavior in powdered zirconium, tritium leak from alumina-coated lithium-compound particles containing zirconium fine particles was roughly estimated in some conditions. Tritium permeation rate can be reduced by adding zirconium but the leak suppression effect is limited.",
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AU - Izumino, J.

AU - Katayama, Kazunari

AU - Matsuura, Hideaki

AU - Fukada, Satoshi

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AB - A tritium production method using a high-temperature gas-cooled reactor loaded with lithium compound particles has been proposed for steadily starting up and stably operating a fusion reactor. In order to confine the produced tritium, small lithium-compound particles are considered to be coated by ceramic materials. The present authors have proposed adding zirconium fine particles into the inside of the ceramic coating to improve tritium confinement performance. In this work, powdered zirconium was exposed to hydrogen or deuterium gas in a closed volume at elevated temperatures and absorption rate constant and Sieverts' constant were evaluated by the pressure drop by absorption. After the experiments, it was found that the powdered zirconium sample became a lump by a sintering effect. By referring literature data for α-zirconium and its oxide, the observed absorption rate was speculated to include the influence of sintering and oxide layer. The obtained Sieverts’ constants were slightly smaller than literature data. By taking into account the observed hydrogen absorption behavior in powdered zirconium, tritium leak from alumina-coated lithium-compound particles containing zirconium fine particles was roughly estimated in some conditions. Tritium permeation rate can be reduced by adding zirconium but the leak suppression effect is limited.

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