Estimation of tritium accumulation in tungsten and its application for ITER divertor

• Project/Area Number: 24360380
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Nuclear fusion studies
• Research Institution: University of Toyama
• Principal Investigator: TORIKAI Yuji 富山大学, 水素同位体科学研究センター, 准教授 (80313592)
• Co-Investigator(Kenkyū-buntansha): KURISHITA Hiroaki 東北大学, 金属材料研究所, 准教授 (50112298) ; ISOBE Kanetsugu 独立行政法人日本原子力研究開発機構, 核融合研究開発部門, 研究主幹 (00354613) ; OYAIZU Makoto 独立行政法人日本原子力研究開発機構, 核融合研究開発部門, 任期付研究員 (60516855)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥18,590,000 (Direct Cost: ¥14,300,000、Indirect Cost: ¥4,290,000); Fiscal Year 2014: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000); Fiscal Year 2013: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000); Fiscal Year 2012: ¥9,750,000 (Direct Cost: ¥7,500,000、Indirect Cost: ¥2,250,000)
• Keywords: プラズマ・壁相互作用 / タングステン / トリチウム蓄積 / ITER

Outline of Final Research Achievements

Tungsten(W) is currently contemplated as plasma facing material because of its advantageous thermo physical properties and rather low solubility of tritium. Tritium solubility of W estimated in this study is 3 order higher than that reported by literature. Traps or oxide films may affect the retention capability of W and lead significantly modified release properties. It became clear that there were capture sites that had different thermal stability and capture intensity in W after polishing, or oxide films that were grown on the surface of W and had barrier effects. Detailed investigation of the impact of possibly rather diverse traps produced either during manufacturing-or via radiation-induced processes and oxide films after annealing on the uptake and retention properties of hydrogen isotopes retained by W used in first wall components of fusion machines is therefore necessary in order to assess correctly and minimize the tritium inventory during various phases of operation.

Research Products

• [Journal Article] Behavior of Tritium in the Vacuum Vessel of JT-60U (2015)
  • Author(s): K. Kobayashi, Y. Torikai, M. Saito, V. Alimov, N. Miya and Y. Ikeda
  • Journal Title: Fusion Sci. and Technol. Volume: 67 Pages: 428-431
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Measurement of Uptake and Release of Tritium by Tungsten (2015)
  • Author(s): M. Nakayama,a, Y. Torikai, M. Saito, R. -D. Penzhorn, K. Isobe, T. Yamanishi, H. Kurishita
  • Journal Title: Fusion Sci. and Technol. Volume: 67 Pages: 503-506
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Tritium Release from SS316 under Vacuum Condition (2015)
  • Author(s): Y. Torikai and R.-D. Penzhorn
  • Journal Title: Fusion Sci. and Technol. Volume: 67 Pages: 615-618
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Tritium Trapping on the Plasma Irradiated Tungsten Surface (2015)
  • Author(s): Y. Torikai, V. Kh. Alimov, K. Isobe, M. Oyaidzu, T. Yamanishi, R.-D. Penzhorn, Y. Ueda, H. Kurishita, V. Philipps, A. Kreter, M. Zlobinski, and TEXTOR Team
  • Journal Title: Fusion Sci. and Technol. Volume: 67 Pages: 619-622
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Current Status of Nanostructured Tungsten-Based Materials Development (2014)
  • Author(s): H. Kurishita, S. Matsuo, H. Arakawa, T. Sakamoto, S. Kobayashi, K. Nakai, H. Okano, H. Watanabe, N. Yoshida, Y. Torikai, Y. Hatano, T. Takida, M. Kato, A. Ikegaya, Y. Ueda, M. Hatakeyama, T. Shikama
  • Journal Title: Phys. Scr. Volume: T159 Pages: 14032-14039
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Current status of nanostructured tungsten-based materials development (2014)
  • Author(s): H. Kurishita, S. Matsuo, H. Arakawa, T. Sakamoto, S. Kobayashi, K. Nakai, H. Okano, H. Watanabe, N. Yoshida, Y. Torikai, Y. Hatano, T. Takida, M. Kato, A. Ikegaya, Y. Ueda, M. Hatakeyama and T. Shikama
  • Journal Title: Physica Scripta Volume: T159 Pages: 14032-14032
  • DOI: 10.1088/0031-8949/2014/t159/014032
• [Journal Article] Effects of Tritiated Water on Passivation Behavior of SUS304 Stainless Steel (2013)
  • Author(s): M. Oyaidzu, K. Isobe, T. Yamanishi
  • Journal Title: ECS Transactions Volume: 50 Pages: 63-69
• [Journal Article] Tritium distribution on the tungsten surface exposed to deuterium plasma and then to tritium gas (2013)
  • Author(s): K. Isobe. V. Kh. Alimov, A. Taguchi, M. Saito, Y. Torikai, Y. Hatano and T. Yamanishi
  • Journal Title: J. Plasma Fusion Res. SERIES Volume: 10 Pages: 81-84
  • Peer Reviewed
• [Journal Article] Tritium loading study of tungsten pre-exposed to TEXTOR plasmas
  • Author(s): Y. Torikai, A. Taguchi, M. Saito, R. D. Penzhorn, Y. Ueda, H. Kurishita, K. Sugiyama, V. Philipps, A. Kreter, M. Zlobinski, TEXTOR team
  • Journal Title: Journal of Nuclear Materials Volume: (in press)
  • Peer Reviewed
• [Journal Article] Deuteriunm retention in Toughened, Fine-Grained Recrystallized Tungsten
  • Author(s): M. Oya, K. Uekita, H.T. Lee, Y. Ohtsuka, Y. Ueda, H. Kurishita, A. Kreter, J.W. Coenen, V. Philipps, S. Brezinsek, A. Litnovsky, K. Sugiyama, Y. Torikai
  • Journal Title: Journal of Nuclear Materials Volume: (in press)
  • Peer Reviewed
• [Journal Article] Effects of Tritiated Water Oil Passivation Behavior of SUS304 Stainless Steel
  • Author(s): M. Oyaidzu, K. Isobe, T. Hayashi, T. Yamanishi
  • Journal Title: ECS Transaction Volume: (in press)
  • Peer Reviewed
• [Presentation] JT-60真空容器のクリアランス(1) トリチウムに汚染したインコネル625からのトリチウム放出挙動 (2014)
  • Author(s): 鳥養 祐二、小林 和容、齋藤 真貴子、宮 直之、池田 佳隆
  • Organizer: PLASMA 2014
  • Place of Presentation: NIIGATA, JAPAN
  • Year and Date: 2014-11-18 – 2014-11-21
• [Presentation] Apparent Tritium Solubility in Fusion Reactor Materials (2014)
  • Author(s): Yuji Torikai, M. Nakayama, M. Saito, V.Kh. Alimov and R.-D. Penzhorna
  • Organizer: 12th Japan-China Symposium on Advanced Energy Systems and Fission and Fusion Engineering
  • Place of Presentation: SHIZUOKA, JAPAN
  • Year and Date: 2014-09-17 – 2014-09-20
• [Presentation] Measurement of Uptake and Release of Tritium by Tungsten (2013)
  • Author(s): M. Nakayama, Y. Torikai, M. Saito, R. –D. Penzhorn, K. Isobe, T. Yamanishi and H. Kurishita
  • Organizer: 10th International Conference on Tritium Science and Technology
  • Place of Presentation: Nice Acropolis France
• [Presentation] TRITIUM TRAPPING ON THE PLASMA IRRADIATED TUNGSTEN SURFACE (2013)
  • Author(s): Y. Torikai, V.Kh. Alimov, K. Isobe, M. Oyaidzu, T. Yamanishi, R.-D. Penzhorn, Y. Ueda, H. Kurishita, V. Philipps, A. Kreter, M. Zlobinski, and TEXTOR Team
  • Organizer: 10th International Conference on Tritium Science and Technology
  • Place of Presentation: Nice Acropolis France
• [Presentation] TRITIUM RELEASE FROM SS316 UNDER VACUUM CONDITION (2013)
  • Author(s): Y. Torikai, R.-D. Penzhorn
  • Organizer: 10th International Conference on Tritium Science and Technology
  • Place of Presentation: Nice Acropolis France
• [Presentation] Behavior of tritium in the vacuum vessel of JT-60U (2013)
  • Author(s): K. Kobayashi, Y. Torikai, M. Saito, N. Miya, and Y. Ikeda
  • Organizer: 10th International Conference on Tritium Science and Technology
  • Place of Presentation: Nice Acropolis France
• [Presentation] Current status of nanostructured tungsten-based materials development (2013)
  • Author(s): H. Kurishita, S. Matsuo, H. Arakawa, T. Sakamoto, S. Kobayashi, K. Nakai, H. Okano, H. Watanabe, N. Yoshida, Y. Torikai, Y. Hatano, T. Takida, M. Kato, A. Ikegaya, Y. Ueda, M. Hatakeyama and T. Shikama
  • Organizer: 14th International Conference on Plasma-Facing Materials and Components for Fusion Applications
  • Place of Presentation: Forschungszentrum Juelich, Germany
• [Presentation] Effects of Tritiated Water on Passivation Behavior of SUS304 Stainless Steel (2013)
  • Author(s): M. Oyaidzu, K. Isobe, T. Hayashi
  • Organizer: 10th International Conference on Tritium Science and Technology
  • Place of Presentation: Nice Acropolis France
• [Presentation] Effects of TIG Welding on Hydrogen Permeation in SUS304 Stainless Steel (2013)
  • Author(s): K. Isobe, T. Hayashi
  • Organizer: 10th International Conference on Tritium Science and Technology
  • Place of Presentation: Nice Acropolis France