Papers

近年の論文など一覧 (Current papers)


Recent student awardees

Mar 2017, ROY G. POST FOUNDATION SCHOLARSHIP, Taichi Sakai
Mar 2017, Atomic Energy Society of Japan, AESJ fellow award, Keigo Fujikawa.
Mar 2017, Atomic Energy Society of Japan, AESJ fellow award, Shota Ueda.
Nov 2016, 9th XJTU-UT-SJTU joint symposium, Best Presentation award, Shigetaka Ueno.
Nov 2016, 9th XJTU-UT-SJTU joint symposium, Best poster award, Erdal Ozdemir.
Sep 2016, Atomic Energy Society of Japan, Best presentation award, Shota Ueda.
Mar 2016, NDEC-1, Research incentive award, Shota Ueda.
Jul 2015, 8th XJTU-UT-SJTU joint symposium, Best poster award, Hongyang Wei.
Jul 2015, 8th XJTU-UT-SJTU joint symposium, Best paper award, Shota Ueda.
Mar 2015, Department of Nuclear Engineering and Management, Award of department dean, Hiroshi Madokoro.


Journal

2017年
[1] H. Wei, N. Erkan, K. Okamoto, X. Gaus-Liu, A. Miassoedov, Improvement and evaluation of debris coolability analysis module in severe accident analysis code SAMPSON using LIVE experiment, Annals of Nuclear Energy, Vol. 100, pp. 65-72 (2017).
[2] P. Chai, M. Kondo, N. Erkan, K. Okamoto, Numerical simulation of MCCI based on MPS method with different types of concrete, Annals of Nuclear Energy, Vol. 103, pp. 227-237 (2017).
[3] H. Gong, A. Khan ,N. Erkan, L. Wang, K. Okamoto, Critical heat flux enhancement in downward-facing pool boiling with radiation induced surface activation effect, International Journal of Heat and Mass Transfer,vol. 109, pp. 93-102 (2017).
[4] L. Wang, A. Khan, N. Erkan, H. Gong, K. Okamoto, Critical heat flux enhancement on a downward face using porus honeycomb plate in saturated flow boiling, International Journal of Heat and Mass Transfer, Vol. 109, pp. 454-461 (2017).
[5] S. Ueda, H. Madokoro, B. Jo, M. Kondo, N. Erkan, K. Okamoto, Dynamic visualization of eutectic reaction between boron carbide and stainless steel, Journal of Nuclear Science and Technology, Vol. 54, pp. 81-88 (2017).

2016年
[1] S. Ueda, H. Madokoro, B. Jo, M.Kondo, N. Erkan and K. Okamoto, Time-resolved visualization technique for eutectic reaction between boron carbide and stainless steel at high temperatures, Mechanical Engineering Letters, Vol.2, (2016) 15-00056.
[2] J. Cai, B. Jo, N. Erkan and K. Okamoto, Effect of non-condensable gas on thermal stratification and flow patterns in suppression pool, Nuclear Engineering and Design, vol. 300, pp. 117-126 (2016).
[3] H. Wei, N. Erkan, K. Okamoto, Experimental investigation of the effect of control rod guide tubes on the breakup of a molten metal jet in the lower plenum of a boiling water reactor under isothermal conditions, Journal of Visualization, pp. 1-12 (2016).
[4] P. Chai, M. Kondo, N. Erkan, K. Okamoto, Numerical simulation of 2D ablation profile in CCI-2 experiment by moving particle semi-implicit method, Nuclear Engineering and Design, Vol. 301, pp. 15-23 (2016).
[5] N. Erkan, P. Chai, K. Okamoto, Natural convection in wake of molten matel moving with phase change of wax, Journal of Visualization, Vol. 19(2), pp. 171-174 (2016).
[6] H. Lopez, N. Erkan, K. Okamoto, Reactor core isolation cooling system analysis of the Fukushima Daiichi Unit 2 accident with RELAP/ScdapSIM, Journal of Nuclear Science and Technology, Vol. 53, pp. 1899-1905 (2016).
[7] D. Yamauchi, B. Jo, N. Erkan, S. Takahashi, W. Sagawa, K. Okamoto, Verification of thermal stratification characteristics using a scaled-down suppression pool of the Fukushima Daiichi nuclear power plants, Mechanical Engineering Letters, Vol.2, (2016) 1600092.
[8] H. Lopez, N. Erkan, K. Okamoto, Twho-phase flow degradation on Fukushima-Daiichi Unit2 RCIC turbne performance, Journal of Nuclear Science and Technology, Vol.53, pp. 821-830 (2016).
[9] B. Jo, N. Erkan, S. Takahashi, D. Song, W. Sagawa, K. Okamoto, Thermal stratification in a scaled-down suppression pool of the Fukushima Daiichi nuclear power plants, Nuclear Engineering and Design, Vol. 305, pp. 39-50 (2016).

2015年
[1] H. Madokoro, N. Erkan, and K. Okamoto, "Assessment of the models in RELAP/SCDAPSIM with QUENCH-06 analysis." Journal of Nuclear Science and Technology, ahead-of-print, 2015
[2] Maolong Liu, Nejdet Erkan, Yuki Ishiwatari, Koji Okamoto, Passive depressurization accident management strategy for boiling water reactors, Nuclear Engineering and Design, Vol. 284, pp.176-184 (2015)
[3] M. Kondo, K. Yoneda, M. Furuya, & T. Nishi. An evaluation model to predict steam concentration in a BWR reactor building. Journal of Nuclear Science and Technology, (2015) doi:10.1080/00223131.2014.1000993.
[4] Kazuya Shibata, Issei Masaie, Masahiro Kondo, Kohei Murotani, Seiichi Koshizuka, Improved pressure calculation for the moving particle semi-implicit method, Computational Particle Mechanics 2(1) (2015) 91-108.
[5] Penghui Chai, Nejdet Erkan, Masahiro Kondo, Koji Okamoto and Hongyang Wei, Experimental research and numerical simulation of moving molten metal pool, Mechanical Engineering Letters 1 (2015) 15-00367.
[6] Abdul R. Khan, Nejdet Erkan and Koji Okamoto, Heat transfer effect of an extended surface in downward-facing subcooled flow boiling, Nuclear Engineering and Design, vol 295, pp. 148-154 (2015)
[7] N. Erkan, T. Kawakami, H. Madokoro, P. Chai, Y. Ishiwatari, K. Okamoto, Numerical simulation of droplet deposition onto a liquid film by VOF?MPS hybrid method. Journal of Visualization, Vol.18, (2015), pp.381-391
[8] Y. Li, S. Someya, K. Okamoto, T. Inagaki, Y. Nishi, Visualization study of flow-excited acoustic resonance in closed tandem side branches using high time-resolved particle image velocimetry, J. Mechanical Sci. Technol. Vol.29, (2015) 989-999
[9] D. Song, N. Erkan, B. Jo, K. Okamoto, Relationship between thermal stratification and flow patterns in steam-quenching suppression pool, Int. J. Heat Fluid Flow, Vol.56 (2015), 209-217
[10] K. Silva, K. Okamoto, Y. Ishiwatari, S. Takahara, J. Promping, Consideration of decontamination model for severe accident consequence assessment, J. Nuclear Science Technology, Vol. 52, (2015) 1402-1416
[11] K. Silva, K. Okamoto, Applicability of 100 TBq cesium 137 release into environment as a safety criterion for consequence assessment at reactor design approval stage, Journal of Nuclear Science and Technology, Vol.52, (2015) 1530-1539
[12] H. Lopez, N. Erkan, K. Okamoto, Two-phase flow degradation on Fukushima-Daiichi Unit 2 RCIC turbine performance, Journal of Nuclear Science Technology, (2015) DOI: 10.1080/00223131.2015.1079507

2014年
[1] Measurement of buckling load for metallic plate columns in severe accident conditions,
byeongnam Jo, Wataru Sagawa, Koji Okamoto, Nuclear Engineering and Design, Vol. 274, pp. 118-128 (2014)
[2] Dimensional analysis of thermal stratification in a suppression pool, Daehun Song, Nejdet Erkan,
Byeongnam Jo, Koji Okamoto,International Journal of Multiphase Flow, Vol. 66, pp. 92-100 (2014)
[3] Full-field spreading velocity measurement inside droplets impinging on a dry slid surface,
Nejdet Erkan, Koji Okamoto, Exp. Fluids, 55:1845 (2014)
[4] Numerical simulation of droplet deposition on to a liquid film by VOF-MPS hybrid method,
Journal of Visualization, Nejdet Erkan, Toshihiro Kawakami, Hiroshi Madokoro, Pengui Chai, Yuki Ishiwatari, Koji Okamoto, 1875-8975 (2014)
[5] Study on flow-induced acoustic resonance in symmetrically located side-branches using dynamic PIV technique,
Yanrong Li, Satoshi Someya, Koji Okamoto, Terumi Inagaki, Yasuyuki Nishi, Journal of Fluid Science and Technology 9(2), JFST0015-JFST0015 (2014)
[6] M. Kondo, T. Arai, Y. Nishi, M. Furuya, T. Kanai, R. Morita, Y. Uchiyama, M. Satake, K. Shirakawa, Y. Nauchi, T. Koyama, K. Ishikawa and S. Suzuki, Early construction and operation of the highly contaminated water treatment system in Fukushima Daiichi nuclear power station (IV) - Assessment of hydrogen behavior in stored Cs adsorption vessel - , Journal of Nuclear Science and Technology 51 (2014) 916-929.
[7] M. Liu, Y. Ishiwatari and K. Okamoto, Estimation of the depressurization process of Fukushima-Daiichi NPP unit 1 with SAMPSON, Nuclear Technology, Vol.186, pp. 216-228 (2014)

2013年
[1] M. Liu, Y. Ishiwatari, "Unsteady numerical simulations of single-phase turbulent mixing in tight lattice geometries," Nucl. Eng. Des., 256, 28-37 (2013)
[2] M. Liu, Y. Ishiwatari, K. Okamoto, “Estimation of the depressurization process of Fukushima Daiichi NPP Unit 1”, 混相流(日本混相流学会誌), 27[2] (2013)
[3] K. Kawahara, Y. Ishiwatari, M. Liu, “Sensitivity analysis regarding alternative water injection in long-term station blackout of BWR,”
J. Nucl. Sci. Tech., 50[2], 201?211 (2013) [4] Y. Li, S. Someya, T. Koso, S. Aramaki, K. Okamoto, “Characterization of periodic flow structure in a small-scale feedback fluid oscillator under low-Reynolds-number water flow,” Flow Measurement and Instrumentation, Vol.33, (2013) 179-187

2012年
[1] M. Liu, Y. Ishiwatari, K. Okamoto, “Estimation of the Depressurization Process of Fukushima Dai-ichi NPP Unit 1 with SAMPSON”, Nuclear Technology (International Meeting on Severe Accident Assessment and Management: Lessons Learned from Fukushima Dai-ichi, Embedded topical meeting of 2012 ANS Winter Meeting and Nuclear Technology Expo
[2] T. Fujiwara, T. Saito, Y. Muroya, H. Sawahata, Y. Yamashita, S. Nagasaki, K. Okamoto, H. Takahashi, M. Uesaka, Y. Katsumura and S. Tanaka, “Isotopic ratio and vertical distribution of radionuclides in soil affected by the accident of Fukushima Dai-ichi nuclear power plants,” J. Environmental Radioactivity. Vol.113 (2012) 37-44.
[3] 岡本孝司, 「全電源喪失について」, 日本原子力学会誌, Vol.54, No.1, pp27-31 (2012).

2011年
[1] Lifetime-based phosphor thermometry of an optical engine using a high-speed CMOS camera,
Someya S.*, Uchida M., Tominaga K., Terunuma H.,Li Y., Okamoto K.,
Int.J. Heat and Mass Transfer, Vol.54(17-18), pp.3927-3932, 2011
[2] A Fractal-based 2D Expansion Method for Multi-scale Volume Data Visualization,
Fujiwara T., Iwamaru M., Tange M., Someya S., Okamoto K.,
Journal of Visualization, Vol.14, No.2, pp.171-190(2011)
[3] An entrained droplet by an unexpanded gas jet into water,
Someya S.**, Uchida M., Li Y., Ohshima H., Okamoto K.,
Journal of Visualization, DOI: 10.1007/s12650-011-0089-7 (2011)
[4] 蛍光体を用いたエンジン筒内ガス温度速度同時計測,
染矢聡*,内田光則,大倉康裕,佐藤義久,岡本孝司,
Trans. JSME B, Vol.xx(xx), pp.xx-xx, 2011 (in print)
[5] T. Fujiwara, M. Iwamaru, M. Tange, S. Someya and K. Okamoto, “A Fractal-based 2D Expansion Method for Multi-scale Volume Data Visualization,” Journal of Visualization, Vol.14, No.2, pp.171-190
[6] S. Someya, Y. Li, K. Ishii K. Okamoto, “Combined Two-Dimensional Velocity and Temperature Measurements of Natural Convection using a High-speed Camera and Temperature Sensitive Particles,”, Experiments in Fluids, (2011) Vol.50(1), pp.65-73
[7]二ノ方壽, 岡本孝司, 「福島第一原子力発電所事故から学ぶ」日本原子力学会誌, Vol.53, No.1, pp540-545 (2011).


国際会議(International conference)

2016年
[1] Experimental Investigation Into Buckling Failure of Slender Metal Plates in Severe Accident Conditions,
Byeongnam Jo, Wataru Sagawa, Koji Okamoto,
2014 22nd International Conference on Nuclear Engineering, No. ICONE22-30829, pp. V001T03A024; 7 pages
[2] Experimental Investigation Into Thermal Stratification by Direct Condensation in a Scaled Suppression Pool of Fukushima Daiichi Nuclear Power Plant,
Byeongnam Jo, Shinji Takahashi, Daehun Song, Wataru Sagawa, Nejdet Erkan, Koji Okamoto,
2014 22nd International Conference on Nuclear Engineering, Vol. 2A, No. ICONE22-30090, pp. V02AT09A010; 9 pages
[3] Buckling Behaviors of Metallic Columns Under Compressive Load at Extremely High Temperatures,
Byeongnam Jo, Wataru Sagawa, Koji Okamoto, ASME 2014 Pressure Vessels and Piping Conference,
Vol. 3, No. PVP2-10-28683, pp. V003T03A103; 7 pages
[4] SCDAP Model Improvement With QUENCH-06 Analysis, Hiroshi Madokoro, Koji Okamoto, Yuki Ishiwatari,
2014 22nd International Conference on Nuclear Engineering, Vol. 5, No. ICONE22-30086, pp. V005T17A010; 8 pages
[5] H. Madokoro, K. Okamoto, C. Allison, L. Siefken, J. Hohorst, and S. Hagen, "Assessment of RELAP/SCDAPSIM/MOD3.5 against the BWR core degradation experiment CORA-17," in The 10th International Topical Meeting on Nuclear Thermal-Hydraulics, Operation and Safety (NUTHOS-10), Okinawa, Japan, 2014, NUTHOS10-1243.

2015年
[1] Experimental Investigation Into Buckling Failure of Slender Metal Plates in Severe Accident Conditions,
Byeongnam Jo, Wataru Sagawa, Koji Okamoto,
2014 22nd International Conference on Nuclear Engineering, No. ICONE22-30829, pp. V001T03A024; 7 pages
[2] Experimental Investigation Into Thermal Stratification by Direct Condensation in a Scaled Suppression Pool of Fukushima Daiichi Nuclear Power Plant,
Byeongnam Jo, Shinji Takahashi, Daehun Song, Wataru Sagawa, Nejdet Erkan, Koji Okamoto,
2014 22nd International Conference on Nuclear Engineering, Vol. 2A, No. ICONE22-30090, pp. V02AT09A010; 9 pages
[3] Buckling Behaviors of Metallic Columns Under Compressive Load at Extremely High Temperatures,
Byeongnam Jo, Wataru Sagawa, Koji Okamoto, ASME 2014 Pressure Vessels and Piping Conference,
Vol. 3, No. PVP2-10-28683, pp. V003T03A103; 7 pages
[4] SCDAP Model Improvement With QUENCH-06 Analysis, Hiroshi Madokoro, Koji Okamoto, Yuki Ishiwatari,
2014 22nd International Conference on Nuclear Engineering, Vol. 5, No. ICONE22-30086, pp. V005T17A010; 8 pages
[5] H. Madokoro, K. Okamoto, C. Allison, L. Siefken, J. Hohorst, and S. Hagen, "Assessment of RELAP/SCDAPSIM/MOD3.5 against the BWR core degradation experiment CORA-17," in The 10th International Topical Meeting on Nuclear Thermal-Hydraulics, Operation and Safety (NUTHOS-10), Okinawa, Japan, 2014, NUTHOS10-1243.
[6] M. Kondo, K. Otsuka, T. Iwasaki, K. Yoshida, Stochastic numerical simulation to predict the dose-rate effect due to competition in stem cell pool, 15th International Congress of Radiation Research (ICRR 2015), 2015 May 25-29, Kyoto (poster)
[7] Masahiro Kondo, Erkan Nejdet, Koji Okamoto, Steam Condensation Effect in Hydrogen Venting from a BWR Reactor Building, International Conference on Hydrogen Safety (ICHS 2015), 2015 October 19-21, Yokohama.
[8] Shota Ueda, Hiroshi Madokoro, Byeongnam Jo, Masahiro Kondo, Koji Okamoto, "Visualization of B4C/SS Eutectic Reaction and Liquefaction for Code Development & Validation”, ASME 2015 Verification and Validation Symposium, VVS2015-8117, Nevada, U.S.A, (May 2015). [Extended Abstract]

2014年
[1] Experimental Investigation Into Buckling Failure of Slender Metal Plates in Severe Accident Conditions,
Byeongnam Jo, Wataru Sagawa, Koji Okamoto,
2014 22nd International Conference on Nuclear Engineering, No. ICONE22-30829, pp. V001T03A024; 7 pages
[2] Experimental Investigation Into Thermal Stratification by Direct Condensation in a Scaled Suppression Pool of Fukushima Daiichi Nuclear Power Plant,
Byeongnam Jo, Shinji Takahashi, Daehun Song, Wataru Sagawa, Nejdet Erkan, Koji Okamoto,
2014 22nd International Conference on Nuclear Engineering, Vol. 2A, No. ICONE22-30090, pp. V02AT09A010; 9 pages
[3] Buckling Behaviors of Metallic Columns Under Compressive Load at Extremely High Temperatures,
Byeongnam Jo, Wataru Sagawa, Koji Okamoto, ASME 2014 Pressure Vessels and Piping Conference,
Vol. 3, No. PVP2-10-28683, pp. V003T03A103; 7 pages
[4] SCDAP Model Improvement With QUENCH-06 Analysis, Hiroshi Madokoro, Koji Okamoto, Yuki Ishiwatari,
2014 22nd International Conference on Nuclear Engineering, Vol. 5, No. ICONE22-30086, pp. V005T17A010; 8 pages
[5] H. Madokoro, K. Okamoto, C. Allison, L. Siefken, J. Hohorst, and S. Hagen, "Assessment of RELAP/SCDAPSIM/MOD3.5 against the BWR core degradation experiment CORA-17," in The 10th International Topical Meeting on Nuclear Thermal-Hydraulics, Operation and Safety (NUTHOS-10), Okinawa, Japan, 2014, NUTHOS10-1243.
[6] Masahiro Kondo, Kimitoshi Yoneda and Yoshihisa Nishi, Numerical Study of Hydrogen Venting froma a Reactor Building Affected by the External Wind, The 9th Korea-Japan Symposium on Nuclear Thermal Hydraulics and Safety (NTHAS9), 2014 November 16-19, Buyeo.

2013年
[1] Improvement of SAMPSON Code for BWR Severe Accident Analysis, Maolong Liu, Yuki Ishiwatari,
Koji Okamoto, 2013 21st International Conference on Nuclear Engineering, Vol. 6, No. ICONE21-16719, pp. V006T15A021; 9 pages

2011年
[1] Visualization Study on Flow-induced Acoustic Resonance in Piping System with Closed Coaxial
Sidebranches, Yanrong Li, Satoshi Someya, Koji Okamoto,
Young Engineers and Scientists Symposium 2011“Alternative Energies ? A Global Perspective”, Paper No.8, Texas A&M University, U.S.A., 1/10-12 (2011)
[2] Experimental Investigation of Flow-induced Vibration Interference between Two Tandem Circular Cylinders,
Shusaku Hotta, Qian Xu, Satoshi Someya, Koji Okamoto,
Young Engineers and Scientists Symposium 2011“Alternative Energies ? A Global Perspective”, Paper No.9, Texas A&M University, U.S.A., 1/10-12 (2011)
[4] Acceleration of Recursive Cross-Correlation PIV using Multiple GPUs,
Shuhei Tarashima, Satoshi Someya, Koji Okamoto,
The 8th ASME-JSME Thermal Engineering Joint Conference (AJTEC2011), ?Paper No.AJTEC2011-44442, Hawai, U.S.A., 3/13-17(14), (2011)


招待講演(Invited/Keynote Talks) (2009〜)

[1] Outline of HTGR, its advantage and merit,
K. Okamoto, The 2nd UAE-Japan Multipurpose HTGR Form, Feb. 28, 2016, (Sharjar, UAE)
[2] Numerical Simulation Developments and V&V for Severe Accident Analysis,
K. Okamoto, Workshop of Nuclear Power Software Development, December 22, 2015, (Beijing, China)
[3] CFD Challenge on Severe Accident Analysis,
K. Okamoto, International Symposium on Severe Accidents Simulation and Experiments for Nuclear Power Plants, December 2-4, 2015, (Zhuhai, China)
[4] Safety management to promote a strong safety culture and achieve good safety,
K. Okamoto, Northeast Asia Nuclear Safety Cooperation Conference (The 3rd TRM+) Oct. 22-23, 2015, (Seoul, Korea)
[5] Collaboration Research between ICL and UT,
K. Okamoto, UK-Japan Nuclear Research Collaboration Workshop, Sept. 10, 2015, London, UK.
[6] Challenge on Severe Accident Simulation,
K. Okamoto, Workshop of Nuclear Power Software Development, December 22, 2015, (Beijing, China)
[7] Numerical Simulation Developments and V&V for Severe Accident Analysis,
K. Okamoto, 原子力学会秋の大会, 計算科学技術部会企画セッション, Sept. 9, 2015, (静岡、日本)
[8] Beyond design basis accidents,
K. Okamoto, 23th Int. Conf. on Nuclear Engineering, May 19, 2015 (Makuhari, Japan)
[9] Severe Accident analysis and PIRT development for Fukushima-Daiichi NPP,
K. Okamoto, 1st Sino-German Symposium on Fundamentals of Advanced Nuclear Safety Technology, Mar.10, 2015 (Shanghai, China)
[10] Nuclear Safety Activity for East Asia,
K. Okamoto, The 3rd East-Asian Nuclear Forum, Apr. 30, 2015 (Seoul, Korea)
[11] 原子力安全確保の規格基準体系の基本的考え方,
K. Okamoto, 日本原子力学会秋の大会、標準委員会企画セッション、Sept.9, 2014, 京都
[12] Post-Fukushima Research Activities for Nuclear Safety,
K. Okamoto, International Nuclear Science and Technology Conference, August 30, 2014 (Bangkok, Thailand)
[13] Post-Fukushima Code and Standard,
K. Okamoto, 22th Int. Conf. on Nuclear Engineering, July 8, 2014 (Prague, Chez)
[14] Lessons Learned from Fukushima-Daiichi NPP Accident,
K. Okamoto, Topical meeting on International Nuclear Law Symposium, Nov.6-7, 2013, (Tokyo, Japan)
[15] Decommissioning of NPP,
K. Okamoto, EDENS Workshop on safety concerns and decommissioning preparedness, Mar. 12 2013, (Seoul, Korea)


総説・解説(Commentaries)

[1] 原子力規制の考え方,
岡本孝司,
エネルギーレビュー, vol. 35, No. 6, (2015)
[2] 格納容器におけるシビアアクシデント,
岡本孝司,
エネルギーレビュー, Vol. 35, No. 9, (2015)
[3] 福島第一発電所のリスク,
岡本孝司,
エネルギーレビュー, Vol. 34, No. 2, (2014)
[4] これからの日本 どうするエネルギー―天動説と地動説,
岡本孝司,
エネルギーレビュー, Vol. 34, No. 5, (2014)
[5] 超安全な原子炉は可能か―超安全炉の考え方,
岡本孝司,
エネルギーレビュー, Vol. 34, No. 6, (2014)
[6] 福島第一はコントロールされている,
岡本孝司,
エネルギーレビュー, Vol. 33, No. 12, (2014)
[7] 原子力に関する可視化研究,
染矢聡*, 岡本孝司, 日本原子力学会熱流動部会
ニュースレター, Vol. 75, (2011)