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Yoshiharu Tobita
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Proceedings Papers

Preliminary Analysis of the Post-Disassembly Expansion Phase and Structural Response Under Unprotected Loss of Flow Accident in Prototype Sodium Cooled Fast Reactor

Yuichi Onoda, Ken-ichi Matsuba, Yoshiharu Tobita, Tohru Suzuki
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, V002T06A037, June 26–30, 2016
Paper No: ICONE24-60893
DOI: https://doi.org/10.1115/ICONE24-60893
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Topics: Accidents, Engineering prototypes, Flow (Dynamics), Sodium fast reactors, Energetics, Reactor vessels, Energy generation, Robustness, Stress, Design
Proceedings Papers

Validation of a 3D Hybrid CFD-DEM Method Based on a Self-Leveling Experiment

Liancheng Guo, Koji Morita, Hirotaka Tagami, Yoshiharu Tobita
Proc. ASME. ICONE22, Volume 4: Radiation Protection and Nuclear Technology Applications; Fuel Cycle, Radioactive Waste Management and Decommissioning; Computational Fluid Dynamics (CFD) and Coupled Codes; Reactor Physics and Transport Theory, V004T10A024, July 7–11, 2014
Paper No: ICONE22-30618
DOI: https://doi.org/10.1115/ICONE22-30618
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Topics: Computational fluid dynamics, Discrete element methods, Fluid dynamics, Particulate matter, Liquid metal cooled reactors, Safety, Accidents, Computational methods, Computer simulation, Computers
Proceedings Papers

Development of an Evaluation Methodology for the Fuel-Relocation Into the Coolant Plenum in the Core Disruptive Accident of Sodium-Cooled Fast Reactors

Kenji Kamiyama, Yoshiharu Tobita, Tohru Suzuki, Ken-ichi Matsuba
Proc. ASME. ICONE22, Volume 3: Next Generation Reactors and Advanced Reactors; Nuclear Safety and Security, V003T06A011, July 7–11, 2014
Paper No: ICONE22-30308
DOI: https://doi.org/10.1115/ICONE22-30308
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Topics: Accidents, Coolants, Fuels, Sodium fast reactors, Model validation, Water, Alloys, Fluid dynamics, Heat, Melting
Proceedings Papers

Safety Evaluation of Prototype Fast-Breeder Reactor: Analysis of ULOF Accident to Demonstrate In-Vessel Retention

Tohru Suzuki, Yoshiharu Tobita, Kenichi Kawada, Hirotaka Tagami, Joji Sogabe
Proc. ASME. ICONE22, Volume 6: Nuclear Education, Public Acceptance and Related Issues; Instrumentation and Controls (I&C); Fusion Engineering; Beyond Design Basis Events, V006T15A020, July 7–11, 2014
Paper No: ICONE22-30604
DOI: https://doi.org/10.1115/ICONE22-30604
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Topics: Accidents, Engineering prototypes, Safety, Vessels, Fuels, Licensing, Failure, Heat, Cooling, Boiling
Proceedings Papers

Development of PIRT (Phenomena Identification and Ranking Table) for SAS-SFR (SAS4A) Validation

Ken-ichi Kawada, Ikken Sato, Yoshiharu Tobita, Werner Pfrang, Laurence Buffe, Emmanuelle Dufour
Proc. ASME. ICONE22, Volume 6: Nuclear Education, Public Acceptance and Related Issues; Instrumentation and Controls (I&C); Fusion Engineering; Beyond Design Basis Events, V006T15A023, July 7–11, 2014
Paper No: ICONE22-30679
DOI: https://doi.org/10.1115/ICONE22-30679
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Topics: Sodium fast reactors, Accidents, Coolants, Boiling, Fuels, Transients (Dynamics), Failure, Flow (Dynamics), Heat, Temperature
Proceedings Papers

Characteristics of Pressure Buildup From Local Fuel-Coolant Interactions in a Simulated Molten Fuel Pool

Songbai Cheng, Ken-ichi Matsuba, Mikio Isozaki, Kenji Kamiyama, Tohru Suzuki, Yoshiharu Tobita
Proc. ASME. ICONE22, Volume 2B: Thermal Hydraulics, V02BT09A059, July 7–11, 2014
Paper No: ICONE22-31221
DOI: https://doi.org/10.1115/ICONE22-31221
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Topics: Coolants, Fuels, Pressure, Water, Sodium fast reactors, Accidents, Subcooling, Temperature, Alloys, Boiling
Proceedings Papers

SIMMER-III Code Assessment for Material Expansion Dynamics During Core Disruptive Accidents in Sodium-Cooled Fast Reactors

Hidemasa Yamano, Yoshiharu Tobita
Proc. ASME. ICONE22, Volume 2A: Thermal Hydraulics, V02AT09A033, July 7–11, 2014
Paper No: ICONE22-30281
DOI: https://doi.org/10.1115/ICONE22-30281
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Topics: Accidents, Dynamics (Mechanics), Sodium fast reactors, Safety, Bubbles, Computers, Coolants, Experimental analysis, Multiphase flow, Vapors
Proceedings Papers

Development of Assessment Method for a Self-Leveling Behavior of Debris Bed and Analyses of Experiments

Hirotaka Tagami, Songbai Cheng, Yoshiharu Tobita, Liancheng Guo, Bin Zhang, Koji Morita
Proc. ASME. ICONE22, Volume 3: Next Generation Reactors and Advanced Reactors; Nuclear Safety and Security, V003T06A010, July 7–11, 2014
Paper No: ICONE22-30290
DOI: https://doi.org/10.1115/ICONE22-30290
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Topics: Accidents, Analytical methods, Boiling, Bubbles, Collisions (Physics), Coolants, Cooling, Deformation, Density, Flow (Dynamics)
Proceedings Papers

Experimental Evaluation of Debris Bed Characteristics in Particulate Debris Sedimentation Behaviour

M. Shamsuzzaman, Tatsuro Horie, Fusata Fuke, Takayuki Kai, Bin Zhang, Tatsuya Matsumoto, Koji Morita, Hirotaka Tagami, Tohru Suzuki, Yoshiharu Tobita
Proc. ASME. ICONE21, Volume 6: Beyond Design Basis Events; Student Paper Competition, V006T15A009, July 29–August 2, 2013
Paper No: ICONE21-15693
DOI: https://doi.org/10.1115/ICONE21-15693
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Topics: Particulate matter, Sedimentation, Nozzles, Shapes, Density, Accidents, Computer simulation, Cooling, Gravity (Force), Reactor vessels
Proceedings Papers

Recent Knowledge From an Experimental Investigation on Self-Leveling Behavior of Debris Bed

Songbai Cheng, Hidemasa Yamano, Tohru Suzuki, Yoshiharu Tobita, Yuya Nakamura, Syohei Taketa, Sinpei Nishi, Bin Zhang, Tatsuya Matsumoto, Koji Morita
Proc. ASME. ICONE21, Volume 4: Thermal Hydraulics, V004T09A048, July 29–August 2, 2013
Paper No: ICONE21-15595
DOI: https://doi.org/10.1115/ICONE21-15595
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Topics: Accidents, Boiling, Collaboration, Computers, Coolants, Density, Fast neutron reactors, Flow (Dynamics), Gas flow, Nuclear power
Proceedings Papers

Numerical Simulation of Self-Leveling Behavior in Debris Bed by a Hybrid Method

Liancheng Guo, Koji Morita, Hirotaka Tagami, Yoshiharu Tobita
Proc. ASME. ICONE21, Volume 3: Nuclear Safety and Security; Codes, Standards, Licensing and Regulatory Issues; Computational Fluid Dynamics and Coupled Codes, V003T10A019, July 29–August 2, 2013
Paper No: ICONE21-15483
DOI: https://doi.org/10.1115/ICONE21-15483
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Topics: Computer simulation, Particulate matter, Discrete element methods, Fast neutron reactors, Fluid dynamics, Fluids, Safety, Accidents, Algorithms, Flow (Dynamics)
Proceedings Papers

Experimental Analyses by SIMMER-III on Duct-Wall Failure and Fuel Discharge/Relocation Behavior

Hidemasa Yamano, Yoshiharu Tobita
Proc. ASME. ICONE21, Volume 3: Nuclear Safety and Security; Codes, Standards, Licensing and Regulatory Issues; Computational Fluid Dynamics and Coupled Codes, V003T10A008, July 29–August 2, 2013
Paper No: ICONE21-15163
DOI: https://doi.org/10.1115/ICONE21-15163
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Topics: Ducts, Experimental analysis, Failure, Fuels, Coolants, Accidents, Boiling, Computers, Fluid dynamics, Melting
Proceedings Papers

Mechanism of Upward Fuel Discharge During Core Disruptive Accident in Sodium-Cooled Fast Reactors

Ken-ichi Matsuba, Mikio Isozaki, Kenji Kamiyama, Yoshiharu Tobita
Proc. ASME. ICONE20-POWER2012, Volume 2: Plant Systems, Structures, and Components; Safety and Security; Next Generation Systems; Heat Exchangers and Cooling Systems, 333-343, July 30–August 3, 2012
Paper No: ICONE20-POWER2012-54224
DOI: https://doi.org/10.1115/ICONE20-POWER2012-54224
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Topics: Accidents, Fuels, Sodium fast reactors, Coolants, Ducts, Density, Enthalpy, Pressure, Flow (Dynamics), Vapor pressure
Proceedings Papers

Numerical Simulation of the Self-Leveling Phenomenon by Modified SIMMER-III

Bin Zhang, Tatsuya Matsumoto, Koji Morita, Hidemasa Yamano, Hirotaka Tagami, Tohru Suzuki, Yoshiharu Tobita
Proc. ASME. ICONE20-POWER2012, Volume 5: Fusion Engineering; Student Paper Competition; Design Basis and Beyond Design Basis Events; Simple and Combined Cycles, 751-760, July 30–August 3, 2012
Paper No: ICONE20-POWER2012-54684
DOI: https://doi.org/10.1115/ICONE20-POWER2012-54684
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Topics: Computer simulation, Particulate matter, Sodium, Accidents, Boiling, Convection, Experimental analysis, Fast neutron reactors, Fluidization, Heat
Proceedings Papers

Numerical Simulation of Three-Phase Flows With Rich Solid Particles by Coupling Multi-Fluid Model With Discrete Element Method

Liancheng Guo, Koji Morita, Yoshiharu Tobita
Proc. ASME. ICONE20-POWER2012, Volume 4: Codes, Standards, Licensing, and Regulatory Issues; Fuel Cycle, Radioactive Waste Management and Decommissioning; Computational Fluid Dynamics (CFD) and Coupled Codes; Instrumentation and Controls; Fuels and Combustion, Materials Handling, Emissions; Advanced Energy Systems and Renewables (Wind, Solar, Geothermal); Performance Testing and Performance Test Codes, 371-382, July 30–August 3, 2012
Paper No: ICONE20-POWER2012-54053
DOI: https://doi.org/10.1115/ICONE20-POWER2012-54053
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Topics: Computer simulation, Discrete element methods, Flow (Dynamics), Fluids, Particulate matter, Multiphase flow, Fast neutron reactors, Fluid dynamics, Fuels, Safety
Journal Articles

Mechanism of Upward Fuel Discharge During Core Disruptive Accidents in Sodium-Cooled Fast Reactors

Ken-ichi Matsuba, Mikio Isozaki, Kenji Kamiyama, Yoshiharu Tobita
Journal: Journal of Engineering for Gas Turbines and Power
Article Type: Research-Article
J. Eng. Gas Turbines Power. March 2013, 135(3): 032901.
Paper No: GTP-12-1355
DOI: https://doi.org/10.1115/1.4007870
Published Online: February 21, 2013
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Topics: Coolants, Ducts, Fuels, Pressure, Sodium fast reactors, Vapors, Accidents, Vapor pressure, Density, Flow (Dynamics)
Proceedings Papers

Experimental Study of Bubble Behavior in a Two-Dimensional Particle Bed With High Solid Holdup

Songbai Cheng, Daisuke Hirahara, Youhei Tanaka, Yoji Gondai, Tatsuya Matsumoto, Koji Morita, Kenji Fukuda, Hidemasa Yamanao, Tohru Suzuki, Yoshiharu Tobita
Proc. ASME. ICONE18, 18th International Conference on Nuclear Engineering: Volume 4, Parts A and B, 697-704, May 17–21, 2010
Paper No: ICONE18-29710
DOI: https://doi.org/10.1115/ICONE18-29710
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Topics: Bubbles, Particulate matter, Accidents, Heat, Nitrogen, Boiling, Breeder reactors, Coolants, Dimensions, Dynamics (Mechanics)
Proceedings Papers

Experimental Analyses by SIMMER-III on Debris-Bed Coolability and Metallic Fuel Freezing Behavior

Hidemasa Yamano, Yoshiharu Tobita
Proc. ASME. ICONE18, 18th International Conference on Nuclear Engineering: Volume 4, Parts A and B, 281-290, May 17–21, 2010
Paper No: ICONE18-29296
DOI: https://doi.org/10.1115/ICONE18-29296
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Topics: Experimental analysis, Freezing, Fuels, Accidents, Boiling, Cladding systems (Building), Computers, Databases, Fluid dynamics, Heat conduction
Proceedings Papers

Detailed Analyses of Specific Phenomena in Core Disruptive Accidents of Sodium-Cooled Fast Reactors by the COMPASS Code

Koji Morita, Shuai Zhang, Tatsumi Arima, Seiichi Koshizuka, Yoshiharu Tobita, Hidemasa Yamano, Takahiro Ito, Noriyuki Shirakawa, Fusao Inoue, Hiroaki Yugo, Masanori Naitoh, Hidetoshi Okada, Yuichi Yamamoto, Masashi Himi, Etsujo Hirano, Sensuke Shimizu, Masaya Oue
Proc. ASME. ICONE18, 18th International Conference on Nuclear Engineering: Volume 4, Parts A and B, 855-863, May 17–21, 2010
Paper No: ICONE18-29886
DOI: https://doi.org/10.1115/ICONE18-29886
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Topics: Accidents, Sodium fast reactors, Failure, Fuels, Ducts, Freezing, Particulate matter, Simulation, Steel, Boiling
Proceedings Papers

Next Generation Safety Analysis Methods for SFRs—(6) SCARABEE BE+3 Analysis With SIMMER-III and COMPASS Codes Featuring Duct-Wall Failure

Yasushi Uehara, Noriyuki Shirakawa, Masanori Naitoh, Hidetoshi Okada, Hidemasa Yamano, Yoshiharu Tobita, Yuichi Yamamoto, Seiichi Koshizuka
Proc. ASME. ICONE17, Volume 5: Fuel Cycle and High and Low Level Waste Management and Decommissioning; Computational Fluid Dynamics (CFD), Neutronics Methods and Coupled Codes; Instrumentation and Control, 435-444, July 12–16, 2009
Paper No: ICONE17-75533
DOI: https://doi.org/10.1115/ICONE17-75533
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Topics: Ducts, Failure, Safety, Sodium fast reactors, Fuels, Model development, Accidents, Freezing, Mesoscopic systems, Metals