Development of analysis method for irradiation defects behaviors to evaluate microstructure in reactor materials

2013 Fiscal Year Final Research Report

• Project/Area Number: 24860025
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Nuclear engineering
• Research Institution: The University of Tokyo
• Principal Investigator: MURAKAMI Kenta 東京大学, 工学(系)研究科(研究院), 助教 (50635000)
• Project Period (FY): 2012-08-31 – 2014-03-31
• Keywords: 原子炉材料 / 照射 / 照射損傷 / イオン照射 / 原子炉圧力容器

Research Abstract

Migration of solute atoms in reactor pressure vessel (RPV) model alloys which were ion-irradiated at < 70 K was studied correlated with the accumulation and recovery of irradiation defects using residual resistivity measurement. Thinning method of specimens, that is required for ion irradiation, was developed. And the effect of thinning to the residual resistivity was evaluated as the function of specimen's thickness. Irradiation-induced resistivity per displacement in iron based alloys is about 50 % larger than that in pure iron. Residual resistivity in ternary alloys is much higher than the binary alloys, so that it indicates the existence of small clusters. These information is the basis to evaluate the microstructure evolution using resistivity measurement.

Research Products

• [Journal Article] Defect formation in iron by MeV ion beam investigated with a positron beam and electrical resistivity measurement (2013)
  • Author(s): T. Iwai, K. Murakami, T. Iwata, Y. Katano
  • Journal Title: Nuclear Instruments and Methods in Physics research Section B Volume: 315 Pages: p. 153-156
  • Peer Reviewed
• [Journal Article] Research on degradation in reactor materials using ion accelerators(査読付きプロシーディング, Tokyo) (2012)
  • Author(s): K. Murakami, et. al.
  • Journal Title: 1st International Conference on Maintenance Science and Technology (ICMST 2012) Pages: 2 pages
  • Peer Reviewed
• [Journal Article] Evaluation of irradiation-induced hardening in reactor pressure vessel steels using nano-indentation technique and ion beams(査読付きプロシーディング, Tokyo) (2012)
  • Author(s): K. Murakami, et. al.
  • Journal Title: 1st International Conference on Maintenance Science and Technology (ICMST 2012) Pages: 2 pages
  • Peer Reviewed
• [Journal Article] Results from project on enhancement of aging management and maintenance in nuclear power plants–Irradiation embrittlement of RPV steels–(プロシーディング, Salt Lake City, Utah) (2012)
  • Author(s): H. Abe, O. Onizawa, J. Katayama, K. Murakami, T. Iwai, T. Iwata, Y. Katano, N. Sekimura, Y. Nagai, T. Toyama, S. Tamura
  • Journal Title: IAEA-CN-194-072, PLiM 2012
• [Presentation] Recovery of ion irradiation-induced resistivity change in RPV model alloys (2013)
  • Author(s): K. Murakami, et. al.
  • Organizer: 17th International Grope on Radiation Damage Mechanisms in Pressure Vessel Steels (IGRDM-17)
  • Place of Presentation: Embiez Island, France (国際会議・口頭発表, P084)
  • Year and Date: 20130500
• [Presentation] Analysis of defects migration in RPV model alloys using low temperature ion irradiation (2012)
  • Author(s): K. Murakami, et. al.
  • Organizer: The Nuclear Materials Conference 2012
  • Place of Presentation: Osaka (国際会議・口頭発表, P084)
  • Year and Date: 20121000
• [Remarks]
  • URL: http://www.nuclear.jp/blt