Possibility of electromagnetic method for evaluation of irradiation embrittlement for highly irradiated nuclear reactor materials

• Project/Area Number: 25289346
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Nuclear engineering
• Research Institution: Iwate University
• Principal Investigator: Kobayashi Satoru 岩手大学, 理工学部, 准教授 (30396410)
• Co-Investigator(Renkei-kenkyūsha): KAMADA YASUHIRO 岩手大学, 理工学部, 教授 (00294025) ; KIKUCHI HIROAKI 岩手大学, 理工学部, 准教授 (30344617)
• Project Period (FY): 2013-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥12,220,000 (Direct Cost: ¥9,400,000、Indirect Cost: ¥2,820,000); Fiscal Year 2017: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2013: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
• Keywords: 磁性 / 中性子照射 / 非破壊評価 / 原子炉圧力容器鋼 / 鉄基合金 / 磁気測定 / 中性子小角散乱 / 原子力エネルギー / 原子力

Outline of Final Research Achievements

Various types of measurements including hardness, magnetic measurements, small-angle neutron scattering experiments were performed for highly neutron-irradiated nuclear pressure vessel steels. For all measuring samples, magnetic properties were found to decrease in the high neutron fluence regime, and its decrease is large for samples with high Cu content, which is a key element of irradiation hardening. Moreover, its decrease has a relationship with volume fraction of Cu precipitates. Considering that magnetic properties exhibits a monotonic decrease with fluence in medium and high fluence regime, magnetic properties can be used for non-destructive evaluation of irradiation hardening.

Research Products

• [Int'l Joint Research] ハンガリー原子力研究所(ハンガリー)
• [Int'l Joint Research] カリフォルニア大学サンタバーバラ校(米国)
• [Int'l Joint Research] カリフォルニア大学サンタバーバラ校(米国)
• [Int'l Joint Research] ハンガリー原子力研究所(ハンガリー)
• [Journal Article] Simultaneous magnetic investigations of Cu precipitation and recovery in thermally aged Fe-Cu alloy by first-order-reversal-curves (2018)
  • Author(s): S. Kobayashi, R. Kawagoe, H. Murakami
  • Journal Title: AIP Advances Volume: 8 Issue: 5
  • DOI: 10.1063/1.5007349
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Investigation of effects of long-term thermal aging on magnetization processe in low-alloy pressure vessel steels using first-order-reversal-curves (2017)
  • Author(s): S. Kobayashi, F. Gillemot, A. Horvath, M. Horvath, L. Almasy, Q. Tian, A. Feoktystov
  • Journal Title: AIP Advances Volume: ７ Issue: 5
  • DOI: 10.1063/1.4973605
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Effect of long-term thermal aging on magnetic hysteresis for low-alloy pressure vessel steel (2017)
  • Author(s): S. Kobayashi, F. Gillemot, A. Horvath, M. Horvath, L. Almasy
  • Journal Title: Journal of Physics: Conference Series Volume: 印刷中
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Effect of neutron flux on magnetic hysteresis in neutron-irradiated pressure vessel steels (2014)
  • Author(s): S. Kobayashi, T. Yamamoto, D. Klingensmith, G.R. Odette, H. Kikuchi, Y. Kamada
  • Journal Title: IEEE Transaction on Magnetics Volume: 50 Issue: 4 Pages: 1-4
  • DOI: 10.1109/tmag.2013.2286401
  • Peer Reviewed
• [Presentation] 高照射量で中性子照射された原子炉圧力容器モデル合金の磁気特性 (2018)
  • Author(s): 村上宏明、小林悟、鎌田康寛、山本琢也、D. Gragg, G.R. Odette
  • Organizer: 日本金属学会第162回春期講演大会
• [Presentation] 中性子照射された原子炉圧力容器鋼の磁気ヒステリシス特性--現在の理解と問題点、今後の方向性-- (2018)
  • Author(s): 小林悟, 山本琢也, D. Klingensmith, D. Gragg, G.R. Odette, F. Gillemot, A. Horvath, L. Almasy, 鎌田康寛, 菊池弘昭
  • Organizer: 平成29年度材料照射研究会
• [Presentation] 熱時効した原子炉圧力容器モデル合金の磁気１次反転曲線 (2018)
  • Author(s): 村上宏明, 小林悟, 鎌田康寛, 山本琢也, D. Klingensmith, D. Gragg, G.R. Odette
  • Organizer: 平成29年度材料照射研究会
• [Presentation] 長期熱時効したA533B型圧力容器鋼の磁気ヒステリシス特性 (2017)
  • Author(s): 村上宏明、小林悟、鎌田康寛、山本琢也、D. Klingensmith、D. Gragg、G.R. Odette
  • Organizer: 日本金属学会第160回春期講演大会
  • Place of Presentation: 首都大学（東京都八王子市）
  • Year and Date: 2017-03-15
• [Presentation] Simultaneous magnetic investigations of Cu precipitation and recovery in thermally aged Fe-Cu alloy by first-order-reversal-curves (2017)
  • Author(s): S. Kobayashi, R. Kawagoe, H. Murakami
  • Organizer: 62nd Annual Conference on Magnetism and Magnetic Materials
  • Int'l Joint Research
• [Presentation] Small-angle neutron scattering study of neutron-irradiated reactor pressure vessel steels; characterization of nano-scale defects and their influence on the magnetic properties (2017)
  • Author(s): S. Kobayashi
  • Organizer: Hungary-China symposium on neutron scattering
  • Int'l Joint Research / Invited
• [Presentation] 磁気1次反転曲線を用いた原子炉圧力容器鋼の微細組織評価 (2017)
  • Author(s): 村上宏明、小林悟、鎌田康寛、山本琢也、D. Gragg, G.R. Odette
  • Organizer: 日本金属学会第161回秋期大会
• [Presentation] BR2で中性子照射された原子炉圧力容器鋼の磁気特性 (2017)
  • Author(s): 小林悟, 村上宏明, 鎌田康寛, 山本琢也, D. Gragg, D. Klingensmith, G.R. Odette, F. Gillemot, A. Horvath, L. Almasy, A. Feoktystov
  • Organizer: 東北大学金研量子エネルギー材料科学国際研究センター 2017年度大洗研究会
• [Presentation] Investigation of effects of long-term thermal aging on magnetization processe in low-alloy pressure vessel steels using first-order-reversal-curves (2016)
  • Author(s): S. Kobayashi, F. Gillemot, A. Horvath, M. Horvath, L. Almasy, Q. Tian, A. Feoktystov
  • Organizer: 61st Annual Conference on Magnetism and Magnetic Materials
  • Place of Presentation: New Orleans（USA）
  • Year and Date: 2016-10-31
  • Int'l Joint Research
• [Presentation] Effect of long-term thermal aging on magnetic hysteresis for low-alloy pressure vessel steel (2016)
  • Author(s): S. Kobayashi, F. Gillemot, A. Horvath, M. Horvath, L. Almasy
  • Organizer: Joint European Magnetic Symposia (JEMS2016)
  • Place of Presentation: Glasgow（UK）
  • Year and Date: 2016-09-21
  • Int'l Joint Research
• [Presentation] 長期熱時効した原子炉圧力容器鋼の磁気特性 (2016)
  • Author(s): 小林悟、渡辺智哉、吉田築、A. Horvath, F. Gillemot, M. Horvath, L. Almasy
  • Organizer: 日本金属学会第159回秋期大会
  • Place of Presentation: 大阪大学（大阪府豊中市）
  • Year and Date: 2016-09-21
• [Presentation] Magnetic NDE using hysteresis scaling (2014)
  • Author(s): Satoru Kobayashi
  • Organizer: 10th meeting of Universal Network for Magnetic Non-Destructive Evaluation
  • Place of Presentation: Vienna, Austria
  • Year and Date: 2014-07-10
• [Presentation] Effect of neutron flux on magnetic hysteresis in neutron-irradiated pressure vessel steels (2013)
  • Author(s): S. Kobayashi, T. Yamamoto, D. Klingensmith, G.R. Odette, H. Kikuchi, Y. Kamada
  • Organizer: Soft Magnetic Materials Conference
  • Place of Presentation: Budapest, Hungary
• [Presentation] Dose rate effect on magnetic hysteresis in neutron-irradiated RPV steels
  • Author(s): S. Kobayashi
  • Organizer: 9th meeting of Universal Network for Magnetic Non-Destructive Evaluation
  • Place of Presentation: Budapest, Hungary