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Investigation of tritium decontamination method under the vacuum condition for fusion reactors

Research Project

Project/Area Number 18K04999
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 31010:Nuclear engineering-related
Research InstitutionNational Institute for Fusion Science

Principal Investigator

Ashikawa Naoko  核融合科学研究所, ヘリカル研究部, 准教授 (00353441)

Co-Investigator(Kenkyū-buntansha) 鳥養 祐二  茨城大学, 理工学研究科(理学野), 教授 (80313592)
Project Period (FY) 2018-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywordsトリチウム低減法 / トリチウム除染法 / 核融合原型炉 / 金属壁 / 等温脱離法 / トリチウム除染 / 等温脱離 / タングステン / 原型炉 / 真空下 / 水素同位体分析 / グロー放電 / GD-OES / 定温脱離法
Outline of Final Research Achievements

In DEMO, the tritium(T) decontamination scenario before the maintenance begins is a key issue. Currently, QST-DEMO team has not yet determined the allowable value of residual T in the plasma vacuum vessel, but it is necessary to indicate a candidate T decontamination technique. Furthermore, constructing a short-term maintenance scenario that includes T decontamination after stopped plasma operations is also important for DEMOs.
The method using decay heat is being studied for T decontamination. The temperature of plasma-facing materials is 623 K, and an upper-temperature limit is 773-823 K due to structural issues of ferritic steel. Therefore, the available temperature range for tritium decontamination is 623-823 K. In this study, we investigated the possibility of tritium decontamination of tungsten materials in temperature control. The result shows T decontamination efficiency at 673K using the isothermal desorption.

Academic Significance and Societal Importance of the Research Achievements

核融合エネルギー炉の実現に向け、定常運転後の残留トリチウム低減法を見出し、かつその運用条件を明らかにするための基礎研究を行った。本課題は核融合炉の定常運転後に必要なプラズマ真空容器の大気開放前の残留トリチウム低減、つまり真空下での除染法に関する研究である。このトリチウム除染の効率的な実施は、核融合装置が設置されているトーラスホール内でのトリチウム拡散防護や、除染によって回収した燃料トリチウムの再利用にもつながる。つまり、核融合プラントの安全性と性能向上につながる研究である。

Report

(5 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (21 results)

All 2021 2020 2019 2018 Other

All Int'l Joint Research (6 results) Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (14 results) (of which Int'l Joint Research: 8 results,  Invited: 2 results)

  • [Int'l Joint Research] PPPL(米国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] ASIPP(中国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] CCFE, Culham Science Centre(英国)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] KTH Royal Institute of Technology(スウェーデン)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] CCFE, Culham Science Centre(英国)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] KTH Royal Institute of Technology(スウェーデン)

    • Related Report
      2019 Research-status Report
  • [Journal Article] Determination of retained tritium from ILW dust particles in JET2020

    • Author(s)
      Ashikawa N.、Torikai Y.、Asakura N.、Otsuka T.、Widdowson A.、Rubel M.、Oyaizu M.、Hara M.、Masuzaki S.、Isobe K.、Hatano Y.、Heinola K.、Baron-Wiechec A.、Jachmich S.、Hayashi T.
    • Journal Title

      Nuclear Materials and Energy

      Volume: 22 Pages: 100673-100673

    • DOI

      10.1016/j.nme.2019.100673

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Control of fuel retention for a long pulse operation2021

    • Author(s)
      N. Ashikawa
    • Organizer
      10th International Workshop on Stochasticity in Fusion Plasmas (SFP)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Observations of spatial distributions after boron dropping to hydrogen/deuterium plasmas in LHD2021

    • Author(s)
      N. Ashikawa, T. Kawate, H. Toyoda, M. Yoshinuma, K. Ida, T. Oishi, R. Lunsford, Z. Sun
    • Organizer
      15th International Workshops on Hydrogen Isotopes in Fusion Reactor Materials
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Material selection matrix for the tritium removal scenario constructions in DEMO2021

    • Author(s)
      N. Ashikawa, Y. Someya, Y. Torikai, H. Takaoka, Y. Oya, Y. Hatano
    • Organizer
      The 30th International Toki Conference on Plasma and Fusion Research
    • Related Report
      2021 Annual Research Report
  • [Presentation] Deuterium desorption from heavy ion irradiated tungsten using isothermal desorption method2021

    • Author(s)
      N. Ashikawa, H. Takaoka, Y. Torikai, Y. Hayashi, T. Hinoki, K. Yabuuchi, Y. Someya
    • Organizer
      第12回エネルギー理工学研究所国際シンポジウム
    • Related Report
      2021 Annual Research Report
  • [Presentation] 核融合原型炉の燃料循環装置に対する課題抽出2021

    • Author(s)
      芦川直子, 片山一成, 岩井保則, 有川安信, 波多野雄治, 大矢恭久, 染谷洋二, 鳥養祐二
    • Organizer
      第38回プラズマ・核融合学会 年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Tritium decontamination on plasma facing materials of DEMO by decay heat2021

    • Author(s)
      N. Ashikawa, Y. Torikai, H. Takaoka, G. Kikuchi, M. Oyaidzu, Y. Someya, T. Hayashi
    • Organizer
      24th International Conference on Plasma Surface Interactions in Controlled Fusion Devices (PSI-24)
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] DEMOにおけるトリチウム脱離に向けた温度調整の最適化2020

    • Author(s)
      芦川直子、鳥養祐二、高岡宏貴、菊地絃太、染谷洋二、中村博文、小柳津誠、坂本宜照
    • Organizer
      プラズマ核融合学会 第37回年会
    • Related Report
      2020 Research-status Report
  • [Presentation] Retained deuterium on tungsten with heavy ion irradiation and their requirement of treatment for T decontamination2020

    • Author(s)
      N. Ashikawa, H. Takaoka, G. Kikuchi, Y. Torikai, M. Kobayashi, T. Hinoki
    • Organizer
      第11回エネルギー理工学研究所国際シンポジウム
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Observations of Tritium Inventory in JET ILW Dust Particles and Applications to Metal Wall Fusion Devices2019

    • Author(s)
      N.Ashikawa, T.Otsuka, Y.Torikai, N.Asakura, A.Widdowson, M.Rubel, H.Furuta, M.Hara, S.Masuzaki, Y.Hatano, H.Nakamura, S.Jachmich, T.Hayashi, JET Contributors
    • Organizer
      The 12th International Conference on Tritium Science and Technology
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Tritium decontamination scenario from plasma facing materials under vacuum condition in DEMO2019

    • Author(s)
      N. Ashikawa, Y. Torikai, M. Nakayama, A. Taguchi, M. Matsuyama, Y. Someya
    • Organizer
      14th International Symposium on Fusion Nuclear Technology
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] DEMOにおける真空条件下でのトリチウム脱離効果2019

    • Author(s)
      芦川直子、鳥養祐二、菊地弦太、中山将人、田口明、松山政夫、染谷洋二 、坂本宜照
    • Organizer
      第38回プラズマ核融合学会年会
    • Related Report
      2019 Research-status Report
  • [Presentation] 原型炉メンテナンス実施に向けたトリ チウム蓄積量の予測および実時間ト リチウム除染法の検討2018

    • Author(s)
      芦川直子,染谷洋二,鳥養祐二,坂本宜照,大矢恭久,波多野雄二,原型炉設計合同特別チーム
    • Organizer
      プラズマ核融合学会
    • Related Report
      2018 Research-status Report
  • [Presentation] Determination of retained tritium from ILW dust particles in JET2018

    • Author(s)
      N. Ashikawa, Y. Torikai, N. Asakura, T. Otsuka, A. Widdowson, M. Rubel, M. Oyaizu, M. Hara, S. Masuzaki, K. Isobe, Y. Hatano, K. Heinola, A. Baron-Wiechec, S. Jachmich, T. Hayashi and JET Contributors
    • Organizer
      International Conference on Plasma Surface Interactions in Controlled Fusion Devices
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Dust Particle Generation from the Controlled thermonuclear Fusion Device Jet with Metallic Plasma-Facing Components2018

    • Author(s)
      N. Ashikawa, N. Asakura, A. Widdowson, M. Rubel, Y. Torikai, T. Otsuka, M. Hara, S. Masuzaki, M. Oyaidzu, K. Isobe,Y. Hatano, D. Hamaguchi, H. Kurotaki, S. Nakano, J.H. Kim, M. Tokitani, R. Sakamoto, J. Grzonka , K. Heinola11), A. Baron-Wiechec, M. Miyamoto, H. Tanigawa, M. Nakamichi, T. Hayashi, and JET Contributors
    • Organizer
      2018 Asia-Pacific Conference on Plasma and Terahertz Science
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2018-04-23   Modified: 2023-01-30  

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