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Koji Okamoto
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Proceedings Papers

Development of the AI-Assisted Thermal Hydraulic Analysis Method for Condensing Bubbles in Vertical Subcooled Flow Boiling

Wen Zhou, Shuichiro Miwa, Koji Okamoto, Tomio Okawa, Ryoma Tsujimura, Thanh-Binh Nguyen
Proc. ASME. ICONE31, Volume 11: Student Paper Competition, V011T15A011, August 4–8, 2024
Publisher: American Society of Mechanical Engineers
Paper No: ICONE31-133410
https://doi.org/10.1115/ICONE31-133410
View Paper titled, Development of the AI-Assisted Thermal Hydraulic Analysis Method for Condensing Bubbles in Vertical Subcooled Flow Boiling
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Topics: Boiling, Bubbles, Condensation, Flow (Dynamics), Subcooling
Proceedings Papers

Investigation of Long Short-Term Memory-Based Models for the Forecasting and Diagnosis of PWR LOCA Progression

Johndel Obra, Shuichiro Miwa, Koji Okamoto
Proc. ASME. ICONE31, Volume 11: Student Paper Competition, V011T15A037, August 4–8, 2024
Publisher: American Society of Mechanical Engineers
Paper No: ICONE31-134780
https://doi.org/10.1115/ICONE31-134780
View Paper titled, Investigation of Long Short-Term Memory-Based Models for the Forecasting and Diagnosis of PWR LOCA Progression
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Topics: Loss of coolant accidents, Pressurized water reactors
Proceedings Papers

Analyzing Flow Rate Impact on CHF Front Behavior During Boiling Crisis in Downward Flow Boiling

Shixian Wang, Kai Wang, Shuichiro Miwa, Koji Okamoto
Proc. ASME. ICONE31, Volume 11: Student Paper Competition, V011T15A001, August 4–8, 2024
Publisher: American Society of Mechanical Engineers
Paper No: ICONE31-124786
https://doi.org/10.1115/ICONE31-124786
View Paper titled, Analyzing Flow Rate Impact on CHF Front Behavior During Boiling Crisis in Downward Flow Boiling
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Topics: Boiling, Critical heat flux, Flow (Dynamics)
Proceedings Papers

Preliminary Core Calculation on Reactivity Compensation for SiC Matrix Fuel Compact HTTR With Erbium Burnable Poison and Plutonium Fissile Material

Yosuke Nishimura, Mohammad Amer Allaf, Shoichiro Okita, Minoru Goto, Koji Okamoto
Proc. ASME. ICONE29, Volume 15: Student Paper Competition, V015T16A055, August 8–12, 2022
Publisher: American Society of Mechanical Engineers
Paper No: ICONE29-91703
https://doi.org/10.1115/ICONE29-91703
View Paper titled, Preliminary Core Calculation on Reactivity Compensation for SiC Matrix Fuel Compact HTTR With Erbium Burnable Poison and Plutonium Fissile Material
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Topics: Fuels
Journal Articles

Radiation-Induced Surface Wettability Enhancement of an Indium Tin Oxide and Titanium Oxide Film-Coated Sapphire

Kai Wang, Hui Liang, Junya Inoue, Nejdet Erkan, Koji Okamoto
Journal: Journal of Nuclear Engineering and Radiation Science
Publisher: ASME
Article Type: Research-Article
ASME J of Nuclear Rad Sci. July 2022, 8(3): 032001.
Paper No: NERS-21-1070
https://doi.org/10.1115/1.4051791
Published Online: May 26, 2022
View Article titled, Radiation-Induced Surface Wettability Enhancement of an Indium Tin Oxide and Titanium Oxide Film-Coated Sapphire
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Topics: Gamma rays, Irradiation (Radiation exposure), Sapphire, Radiation (Physics), Titanium dioxide, Electron beams, Titanium, Nucleate boiling
Proceedings Papers

Transient Three-Dimensional Density Distribution Reconstructed From Limited Interferogram Images

Koji Okamoto, Daigo Tsuru
Proc. ASME. IMECE98, Heat Transfer: Volume 5 — Numerical and Experimental Methods in Heat Transfer, 523-528, November 15–20, 1998
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1998-0771
https://doi.org/10.1115/IMECE1998-0771
View Paper titled, Transient Three-Dimensional Density Distribution Reconstructed From Limited Interferogram Images
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Topics: Density, Transients (Dynamics), Interferometers, Computers, Nuclear power stations, Optimization, Safety, Stratified flow
Proceedings Papers

The pH Distribution During CO2 Dissolving Into Water Under Mid-Depth Sea Condition

Satoshi Someya, Masahiro Nishio, Baixin Chen, Koji Okamoto, Tsutomu Uchida
Proc. ASME. IMECE2000, Heat Transfer: Volume 1, 237-243, November 5–10, 2000
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2000-1388
https://doi.org/10.1115/IMECE2000-1388
View Paper titled, The pH Distribution During CO2 Dissolving Into Water Under Mid-Depth Sea Condition
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Topics: Carbon dioxide, Seas, Water, Drops, Oceans, Climate change, Fluorescence, Greenhouse gases, High pressure (Physics), Low temperature
Proceedings Papers

Extension of Harmonic Balance Approach for Large-Eddy Simulation of Unsteady Flows in Cascade

Yuma Iwamoto, Susumu Teramoto, Koji Okamoto
Proc. ASME. GT2021, Volume 2C: Turbomachinery — Design Methods and CFD Modeling for Turbomachinery; Ducts, Noise, and Component Interactions, V02CT34A015, June 7–11, 2021
Publisher: American Society of Mechanical Engineers
Paper No: GT2021-59193
https://doi.org/10.1115/GT2021-59193
View Paper titled, Extension of Harmonic Balance Approach for Large-Eddy Simulation of Unsteady Flows in Cascade
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Topics: Cascades (Fluid dynamics), Large eddy simulation, Unsteady flow, Turbulence, Fluctuations (Physics), Simulation, Flow (Dynamics), Algorithms, Channel flow, Flutter (Aerodynamics)
Proceedings Papers

Effects of the Large Eddy Simulation Calculation Parameters on Prediction of Profile Loss in an Axial Cascade at Off-Design Incidence

Yuntae Lee, Susumu Teramoto, Takahiko Toki, Koji Okamoto
Proc. ASME. GT2020, Volume 2C: Turbomachinery, V02CT35A011, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-14554
https://doi.org/10.1115/GT2020-14554
View Paper titled, Effects of the Large Eddy Simulation Calculation Parameters on Prediction of Profile Loss in an Axial Cascade at Off-Design Incidence
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Topics: Cascades (Fluid dynamics), Design, Large eddy simulation, Turbulence
Journal Articles

A Happy New Year…

Koji Okamoto
Journal: Journal of Nuclear Engineering and Radiation Science
Publisher: ASME
Article Type: Guest Editorial
ASME J of Nuclear Rad Sci. January 2019, 5(1): 010301.
Paper No: NERS-18-1103
https://doi.org/10.1115/1.4041822
Published Online: January 24, 2019
View Article titled, A Happy New Year…
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Topics: Accidents, Fukushima nuclear disaster, Japan, 2011, Japan Society of Mechanical Engineers, Nuclear engineering, Nuclear industry, Nuclear power, Nuclear power stations, Safety, Nuclear decommissioning, Collaboration
Proceedings Papers

Preliminary Research on the Oxidation Effect of the Carbon Steel Plate of Downward Facing Pool Boiling by Two-Dimensional Image

Kai Wang, Nejdet Erkan, Koji Okamoto
Proc. ASME. ICONE26, Volume 9: Student Paper Competition, V009T16A067, July 22–26, 2018
Publisher: American Society of Mechanical Engineers
Paper No: ICONE26-82019
https://doi.org/10.1115/ICONE26-82019
View Paper titled, Preliminary Research on the Oxidation Effect of the Carbon Steel Plate of Downward Facing Pool Boiling by Two-Dimensional Image
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Topics: Carbon steel, Oxidation, Pool boiling, Critical heat flux, Heart failure, Copper, Cooling, Heating, Reactor vessels, Bubbles
Proceedings Papers

Development of Security and Safety Fuel for Pu-Burner HTGR: Part 2 — Design Study of Fuel and Reactor Core

Minoru Goto, Shohei Ueta, Jun Aihara, Yoshitomo Inaba, Yuji Fukaya, Yukio Tachibana, Koji Okamoto
Proc. ASME. ICONE25, Volume 5: Advanced and Next Generation Reactors, Fusion Technology; Codes, Standards, Conformity Assessment, Licensing, and Regulatory Issues, V005T05A031, July 2–6, 2017
Publisher: American Society of Mechanical Engineers
Paper No: ICONE25-67110
https://doi.org/10.1115/ICONE25-67110
View Paper titled, Development of Security and Safety Fuel for Pu-Burner HTGR: Part 2 — Design Study of Fuel and Reactor Core
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Topics: Design, Fuels, Safety, Security, Very high temperature reactors, Pressure, Oxygen, Coating processes, Coatings, Failure
Proceedings Papers

Development of Security and Safety Fuel for Pu-Burner HTGR: Part 3 — Preliminary Reactor Safety Analyses Under Depressurization Accidents

Masaaki Nakano, Kazutaka Ohashi, Koji Okamoto
Proc. ASME. ICONE25, Volume 5: Advanced and Next Generation Reactors, Fusion Technology; Codes, Standards, Conformity Assessment, Licensing, and Regulatory Issues, V005T05A025, July 2–6, 2017
Publisher: American Society of Mechanical Engineers
Paper No: ICONE25-66907
https://doi.org/10.1115/ICONE25-66907
View Paper titled, Development of Security and Safety Fuel for Pu-Burner HTGR: Part 3 — Preliminary Reactor Safety Analyses Under Depressurization Accidents
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Topics: Accidents, Fuels, Safety, Security, Very high temperature reactors, Design, Scram, Uranium, Accident management, Combustion
Proceedings Papers

Melting Simulation Using a Particle Method With Angular Momentum Conservation

Masahiro Kondo, Shota Ueda, Koji Okamoto
Proc. ASME. ICONE25, Volume 4: Nuclear Safety, Security, Non-Proliferation and Cyber Security; Risk Management, V004T06A033, July 2–6, 2017
Publisher: American Society of Mechanical Engineers
Paper No: ICONE25-67588
https://doi.org/10.1115/ICONE25-67588
View Paper titled, Melting Simulation Using a Particle Method With Angular Momentum Conservation
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Topics: Angular momentum, Melting, Particulate matter, Simulation, Geometry, Accidents, Cantilevers, Dams, Nuclear power stations, Solidification
Proceedings Papers

Development of Security and Safety Fuel for Pu-Burner HTGR: Part 5 — Test and Characterization for ZrC Coating

Shohei Ueta, Jun Aihara, Minoru Goto, Yukio Tachibana, Koji Okamoto
Proc. ASME. ICONE25, Volume 5: Advanced and Next Generation Reactors, Fusion Technology; Codes, Standards, Conformity Assessment, Licensing, and Regulatory Issues, V005T05A047, July 2–6, 2017
Publisher: American Society of Mechanical Engineers
Paper No: ICONE25-67530
https://doi.org/10.1115/ICONE25-67530
View Paper titled, Development of Security and Safety Fuel for Pu-Burner HTGR: Part 5 — Test and Characterization for ZrC Coating
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Topics: Coating processes, Coatings, Fuels, Safety, Security, Very high temperature reactors, Particulate matter, Electron microscopes, Gases, Weight (Mass)
Proceedings Papers

Development of Security and Safety Fuel for Pu-Burner HTGR: Part 4 — Study on 3S-TRISO Fuel Fabrication

Yohei Saiki, Masaki Honda, Masashi Takahashi, Koichi Ohira, Koji Okamoto
Proc. ASME. ICONE25, Volume 5: Advanced and Next Generation Reactors, Fusion Technology; Codes, Standards, Conformity Assessment, Licensing, and Regulatory Issues, V005T05A028, July 2–6, 2017
Publisher: American Society of Mechanical Engineers
Paper No: ICONE25-67048
https://doi.org/10.1115/ICONE25-67048
View Paper titled, Development of Security and Safety Fuel for Pu-Burner HTGR: Part 4 — Study on 3S-TRISO Fuel Fabrication
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Topics: Fuels, Manufacturing, Safety, Security, Very high temperature reactors, Particulate matter, Coating processes, Coatings, High temperature, Fluidized beds
Proceedings Papers

Creep Buckling and Post Buckling Behaviors of Stainless Steel Tube Columns Under External Pressure at Extremely High Temperatures

Byeongnam Jo, Koji Okamoto, Naoto Kasahara
Proc. ASME. PVP2016, Volume 3: Design and Analysis, V003T03A085, July 17–21, 2016
Publisher: American Society of Mechanical Engineers
Paper No: PVP2016-63226
https://doi.org/10.1115/PVP2016-63226
View Paper titled, Creep Buckling and Post Buckling Behaviors of Stainless Steel Tube Columns Under External Pressure at Extremely High Temperatures
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Topics: Buckling, Creep, External pressure, High temperature, Stainless steel, Failure, Temperature, Heating, Pressure, Stress
Proceedings Papers

Structural Analysis Approach for Risk Assessment Under BDBE

Naoto Kasahara, Izumi Nakamura, Hideo Machida, Koji Okamoto, Takuya Sato
Proc. ASME. PVP2016, Volume 3: Design and Analysis, V003T03A086, July 17–21, 2016
Publisher: American Society of Mechanical Engineers
Paper No: PVP2016-63416
https://doi.org/10.1115/PVP2016-63416
View Paper titled, Structural Analysis Approach for Risk Assessment Under BDBE
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Topics: Risk assessment, Structural analysis, Failure mechanisms, Failure, Design, Accidents, Creep, Defense industry, Earthquakes, Inelastic analysis
Proceedings Papers

Estimation About Amounts of Radioactive Wastes From Fukushima Daiichi Nuclear Power Station

Taichi Sakai, Shunichi Suzuki, Koji Okamoto
Proc. ASME. ICONE24, Volume 5: Student Paper Competition, V005T15A064, June 26–30, 2016
Publisher: American Society of Mechanical Engineers
Paper No: ICONE24-60873
https://doi.org/10.1115/ICONE24-60873
View Paper titled, Estimation About Amounts of Radioactive Wastes From Fukushima Daiichi Nuclear Power Station
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Topics: Fukushima nuclear disaster, Japan, 2011, Nuclear power stations, Radioactive wastes, Vessels, Nuclides, Radioisotopes, Accidents, Cooling, Fittings, Fuels
Proceedings Papers

Development of “Proactive Safety Review Guideline for Continuous Improvement on Nuclear Power Plants”

Yoshiyuki Narumiya, Koji Okamoto, Shingo Ueno, Kentaro Hayashi, Takahiro Kuramoto
Proc. ASME. ICONE24, Volume 2: Smart Grids, Grid Stability, and Offsite and Emergency Power; Advanced and Next Generation Reactors, Fusion Technology; Safety, Security, and Cyber Security; Codes, Standards, Conformity Assessment, Licensing, and Regulatory Issues, V002T08A006, June 26–30, 2016
Publisher: American Society of Mechanical Engineers
Paper No: ICONE24-60821
https://doi.org/10.1115/ICONE24-60821
View Paper titled, Development of “Proactive Safety Review Guideline for Continuous Improvement on Nuclear Power Plants”
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Topics: Nuclear power stations, Safety, Nuclear power