Uncertainty Evaluation in Nuclear Designs of Thermal Reactors

• Project/Area Number: 26420867
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Nuclear engineering
• Research Institution: University of Fukui
• Principal Investigator: Takeda Toshikazu 福井大学, 附属国際原子力工学研究所, 特任教授 (30116058)
• Co-Investigator(Kenkyū-buntansha): 松本 英樹 福井大学, 附属国際原子力工学研究所, 客員教授 (80607276)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000); Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2014: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: 軽水炉 / 実効増倍率 / 核特性の不確かさ / 多郡ミクロ断面積 / 多郡ミクロ断面積調整 / 2郡マクロ断面積 / PWR炉心 / 多群ミクロ断面積 / 多群ミクロ断面積調整 / 2群マクロ断面積 / 不確かさ評価 / 測定データ / プルトニウム燃料 / トリウム燃料 / 感度係数 / 不確かさ / 核特性

Outline of Final Research Achievements

At first a new method has been developed to calculate sensitivity coefficients of　neutronics parameters with respect to infinite dilution cross sections. Usually
in Japan the sensitivities are calculated with respect to effective cross sections.Using the new method sensitivities for various kind of cells are calculated. Compared with the conventional sensitivities, it was found that the newly calculated sensitivities differ from the conventional results up to twice in the resonant energy groups. To reduce the uncertainties a cross section adjustment was carried out using TCA-UO2 experimental data. As the result the uncertainty of k-eff for equilibrium states of PWR cores was decreased from about 0.4% to 0.2%dk. Thus it was found that the adjustment is effective to reduce uncertainties of core parameters.

Research Products

• [Journal Article] A new cross section adjustment method of removing systematic errors in fast reactors, (2017)
  • Author(s): 竹田 敏一
  • Journal Title: Annals of Nuclear Energy Volume: 109 Pages: 698-704
  • Peer Reviewed / Open Access
• [Journal Article] Sensitivity and uncertainty analyses reactivities for PWR cells with UO2 and MOX fuels (2016)
  • Author(s): Basma Fouad,Toshikazu Takeda
  • Journal Title: Annals of Nuclear Energy Volume: 90 Pages: 468-479
  • Peer Reviewed
• [Journal Article] Sensitivity and uncertainty analysis for UO2 and MOX fueled PWR cells (2015)
  • Author(s): Basma Foad, 竹田 敏一
  • Journal Title: Annals of Nuclear Energy Volume: 75 Pages: 595-604
  • Peer Reviewed
• [Journal Article] IR APPROXIMATION FOR CALCULATING SENSITIVITY AND UNCERTAINTY OF PWR CELLS AND BY TAKING ACCOUNT OF SELF-SHIELDING EFFECT (2014)
  • Author(s): Basma FOAD, Toshikazu Takeda
  • Journal Title: Proc. Int. Conf. PHYSOR 2014 Volume: 1
  • Peer Reviewed
• [Journal Article] SENSITIVITY AND UNCERTAINTY CALCULATIONS METHOD OF NEUTRONICS CHARACTERISTICS IN PWR CORE PARTⅠ: THEORY AND SENSITIVITY CALCULATIONS (2014)
  • Author(s): Toshikazu Takeda, Basma FOAD, Hiroki Katagiri, Hideki Matsumoto, Kazuki Kirimura
  • Journal Title: Proc. Int. Conf. PHYSOR 2014 Volume: 1
  • Peer Reviewed
• [Journal Article] Importance of self-shielding for improving sensitivity coefficients in light water nuclear reactors (2014)
  • Author(s): Toshikazu Takeda, Basma Foad
  • Journal Title: Annals of Nuclear Energy Volume: Vol.63 Pages: 417-426
  • Peer Reviewed
• [Presentation] PWR炉心における核特性パラメータの不確かさ解析 (2017)
  • Author(s): 竹本友樹、桐村一生、小坂進矢、松本英樹、竹田敏一
  • Organizer: 日本原子力学会
• [Presentation] SENSITIVITIES AND UNCERTAINTIES OF REACTION RATE RATIOS IN PWR CELLS WITH UO2 AND MOX FUEL (2016)
  • Author(s): B.Foud,T.Takeda
  • Organizer: PHYSOR2016
  • Place of Presentation: アメリカ、サンバレー
  • Year and Date: 2016-05-01
  • Int'l Joint Research
• [Presentation] SENSITIVITY AND UNCERTAINTY CALCULATIONS METHOD OF NEUTRONICS CHARACTERISTICS IN PWR CORE PARTⅠ: THEORY AND SENSITIVITY CALCULATIONS (2014)
  • Author(s): 竹田 敏一, Basma Foad, 片桐 寛樹, 松本 英樹, 桐村 一生
  • Organizer: PHYSOR 2014
  • Place of Presentation: 京都
  • Year and Date: 2014-10-02
• [Presentation] IR APPROXIMATION FOR CALCULATING SENSITIVITY AND UNCERTAINTY OF PWR CELLS AND BY TAKING ACCOUNT OF SELF-SHIELDING EFFECT (2014)
  • Author(s): Basma Foad, 竹田 敏一
  • Organizer: PHYSOR 2014
  • Place of Presentation: 京都
  • Year and Date: 2014-10-01
• [Presentation] Sensitivity and Uncertainty Analysis of Reactivities for UO2 and MOX Fueled PWR cells (2014)
  • Author(s): Basma Foad, 竹田 敏一
  • Organizer: 日本原子力学会 秋の大会 2014
  • Place of Presentation: 京都大学
  • Year and Date: 2014-09-10
• [Presentation] PWR 炉心における核特性パラメータの不確かさ解析；（3）燃焼 炉心に対する適用性検討 (2014)
  • Author(s): 松本英樹, 竹本友樹, 桐村一生, 小坂進矢, 竹田 敏一
  • Organizer: 日本原子力学会 秋の大会 2014
  • Place of Presentation: 京都大学
  • Year and Date: 2014-09-10
• [Presentation] Sensitivity and Uncertainty Analysis of UO2 and MOX Fueled PWR Cells by Taking Account of Resonance Self-Shielding Effect (2014)
  • Author(s): 竹田 敏一, Basma Foad
  • Organizer: ICAPP 2014
  • Place of Presentation: Westin Charlotte
  • Year and Date: 2014-04-09
• [Funded Workshop] 国際会議M＆C 2017（International Conference on Mathematics＆ Computational Method Applied to Nuclear Science & Engineering (2017)