Atomic Energy Society of Japan

[1A01]Estimation of the In-Depth Debris Status of Fukushima Unit-2 and Unit-3 with Multi-Physics Modeling(6)Overview and Preliminary Criticality Evaluation of the Unit-3 Pedestal Debris

*Akifumi Yamaji¹, Kazuma Kishimoto¹, Xin Li¹, Masahiro Furuya¹, Ikken Sato³, Hiroshi Madokoro³, Yuji Ohishi²(1. Waseda Univ., 2. Osaka Univ., 3. JAEA)

2021 Annual MeetingWed. Mar 17, 2021Download PDF

[1A02]Estimation of the In-Depth Debris Status of Fukushima Unit-2 and Unit-3 with Multi-Physics Modeling(7)Preliminary evaluation of debris relocation and interaction with pedestal structures in Fukushima Unit-3 with MPS method

*Xin Li¹, Akifumi Yamaji¹, Ikken Sato², Masahiro Furuya¹, Hiroshi Madokoro², Hirofumi Fukai¹, Yuji Ohishi³(1. Waseda Univ., 2. JAEA, 3. Osaka Univ.)

2021 Annual MeetingWed. Mar 17, 2021Download PDF

[1A03]Estimation of the In-Depth Debris Status of Fukushima Unit-2 and Unit-3 with Multi-Physics Modeling(8)Specific heat of Fe-B molten alloy

*Yuji Ohishi¹, Kiu Tanaka¹, Yifan Sun¹, Hiroaki Muta¹(1. Osaka Univ.)

2021 Annual MeetingWed. Mar 17, 2021Download PDF

[1A04]Investigation of Accident Scenario and Fission Products Behaviors in Fukushima Daiichi Nuclear Power Plant using SAMPSON code(1)Summary of the Accident Scenario Investigation using SAMPSON code

*Kenichi Tezuka¹, Chiaki Kino¹, Nobuyoshi Tsuzuki¹(1. IAE)

2021 Annual MeetingWed. Mar 17, 2021Download PDF

[1A05]Investigation of Accident Scenario and Fission Products Behaviors in Fukushima Daiichi Nuclear Power Plant using SAMPSON codeEstimation of FP behaviors using SAMPSON code

*Chiaki Kino¹, Kenichi Tezuka¹, Nobuyoshi Tsuzuki¹(1. IAE)

2021 Annual MeetingWed. Mar 17, 2021Download PDF

[1A06]Temperature change due to radiative cooling under the fuel rod exposure in Fuku-Ichi No.1 ReactorRecursive calculation of temperature using a simplified 3-D(2)

*Kiyoshi Yoneyama¹, Kazuo Watanabe²(1. H.O.Yoneyama, 2. WNR-Cx Watanabe Lab.)

2021 Annual MeetingWed. Mar 17, 2021Download PDF

[1A_PL01]Numererical Simulation with Two-Phase Flow Model

*Hiroyuki Yoshida¹(1. JAEA)

2021 Annual MeetingWed. Mar 17, 2021Download PDF

[1A_PL02]Current Status and Issues for CFD Simulation of Boiling Phenomena

*Kei Ito¹(1. Kyoto Univ.)

2021 Annual MeetingWed. Mar 17, 2021Download PDF

[1A_PL03]Current Status and Issues for Direct Numerical Simulation of Boiling Phenomena

*Yasuo Ose¹(1. YSE)

2021 Annual MeetingWed. Mar 17, 2021Download PDF

[1A07]Evaluation of characteristic of natural circulation flow on isolation condenser in the presence of non-condensable gas

*Tetsuya Takada¹, Yasunori Yamamoto¹, Kosuke Ono¹(1. Hokkaido Univ.)

2021 Annual MeetingWed. Mar 17, 2021Download PDF

[1A08]Effect of Diameters and Fluid Properties on Flow Characteristics in Vertical Pipes under Flooding at the Top End

*Toshiya Takaki¹, Michio Murase¹, Kosuke Hayashi², Akio Tomiyama²(1. INSS, 2. Kobe Univ.)

2021 Annual MeetingWed. Mar 17, 2021Download PDF

[1A09]An Improved Mechanistic Model for Prediction of Bubble Lift-off Diameter in Subcooled Flow Boiling for Inclined Heating Surface

*M. A. Rafiq Akand¹, Kei Kitahara¹, Tatsuya Matsumoto¹, Wei Liu¹, Koji Morita¹(1. Kyushu Univ.)

2021 Annual MeetingWed. Mar 17, 2021Download PDF

[1A10]Development of a 3D gas-liquid two-phase flow measurement system using multi-view cameras

*Miki Saito¹, Taizo Kanai¹, Satoshi Nishimura¹(1. CRIEPI)

2021 Annual MeetingWed. Mar 17, 2021Download PDF

[1A11]Development of a System Analysis Code for NPP(3)Code Validation Based on Void Fraction Measurement Tests

*Junichi Kaneko¹, Naofumi Tsukamoto¹(1. NRA)

2021 Annual MeetingWed. Mar 17, 2021Download PDF

[1A_AC]Awards Ceremony

2021 Annual MeetingWed. Mar 17, 2021Download PDF

[2A01]Particle-based simulation on heat transfer behavior between molten pool and duct wall in EAGLE ID1 and ID2 in-pile tests

*Ting Zhang¹, Koji Morita¹, Xiaoxing Liu¹, Wei Liu¹, Kenji Kamiyama²(1. Kyushu Univ., 2. JAEA)

2021 Annual MeetingThu. Mar 18, 2021Download PDF

[2A02]Numerical Analysis of Decay Heat Removal Experiments using Dipped-type Direct Heat Exchanger in sodium test facility PLANDTL-2 for Sodium-cooled Fast Reactor Development

*Toshiki Ezure¹, Yasuhiro Miyake², Erina Hamase¹, Masaaki Tanaka¹(1. JAEA, 2. NDD)

2021 Annual MeetingThu. Mar 18, 2021Download PDF

[2A03]Droplet Entrainment Phenomena Affected by Interfacial Behavior of a High-Speed Gas Jet into a Liquid Pool

*Masafumi Saito¹, Akiko Kaneko¹, Yutaka Abe¹, Akihiro Uchibori², Akikazu Kurihara², Takashi Takata², Hiroyuki Ohshima²(1. Univ. of Tsukuba, 2. JAEA)

2021 Annual MeetingThu. Mar 18, 2021Download PDF

[2A04]Study on cooling process of decay heat removal systems in a reactor vessel of sodium-cooled fast reactor by scaled water experiments(4)Effect of heat generation condition on natural convection flow field in reactor vessel.

*Mitsuyo Tsuji¹, Kosuke Aizawa¹, Jun Kobayashi¹, Akikazu Kurihara¹, Shigeru Nakane², Katsuji Ishida³(1. JAEA, 2. NESI, 3. Ascend)

2021 Annual MeetingThu. Mar 18, 2021Download PDF

[2A05]Penetration Behavior of Liquid Jet Falling into a Shallow Pool(9)3D Measurement of Liquid Film Behavior and Fragment

*Sota Yamamura¹, Hiroyuki Yoshida², Naoki Horiguchi², Akiko Kaneko¹, Yutaka Abe¹(1. Univ. of Tsukuba, 2. JAEA)

2021 Annual MeetingThu. Mar 18, 2021Download PDF

[2A06]Spreading Behavior of Molten Metal on Flat Plate in a Shallow Pool

*Yasunori Yamamoto¹, Tomomasa Ito¹, Kyosuke Nihashi¹, Shuichiro Miwa¹(1. Hokkaido Univ.)

2021 Annual MeetingThu. Mar 18, 2021Download PDF

[2A07]Study on uncertainties associated with molten debris cooling behaviors(1)Jet breakup and melt spread behaviors

*Wataru Kikuchi¹, Miyuki Akiba¹, Akitoshi Hotta¹, Toshinori Matsumoto³, Alexander Konovalenko², Walter Villanueva², Sevostian Bechta²(1. Nuclear Regulation Authority, 2. Royal Institute of Technology, 3. Japan Atomic Energy Agency)

2021 Annual MeetingThu. Mar 18, 2021Download PDF

[2A08]Study on uncertainty associated with molten debris cooling behavior(2)Melt penetration behavior

*Miyuki Akiba¹, Akitoshi Hotta¹, Wataru Kikuchi¹, S. Mohsen Hoseyni², Walter Villanueva², Sevostian Bechta²(1. NRA, 2. KTH)

2021 Annual MeetingThu. Mar 18, 2021Download PDF

[2A_PL01]Summarry of Part I: "Focused on 1F accident"1)Follow-up WG on "Recommendations from AESJ 1F accident investigation committee"

*Seiichi Koshizuka¹(1. UTokyo)

2021 Annual MeetingThu. Mar 18, 2021Download PDF

[2A_PL02]Summarry of Part I: "Focused on 1F accident"2)Review committee on 1F decommissioning

*Hiroshi Miyano¹(1. Former Hosei Univ.)

2021 Annual MeetingThu. Mar 18, 2021Download PDF

[2A_PL03]Summarry of Part I: "Focused on 1F accident"3)Fukushima Support Project

*Reiko Fujita¹(1. Former TOSHIBA)

2021 Annual MeetingThu. Mar 18, 2021Download PDF

[2A_PL04]Summary of Part II: "Visions of nuclear science and technology"

*Kenta Murakami¹(1. Nagaoka Univ. of Tech.)

2021 Annual MeetingThu. Mar 18, 2021Download PDF

[2A_PL05]Discussion for the future based on the reflection of the accident

Seiichi Koshizuka¹, Hiroshi Miyano², Reiko Fujita³, Kenta Murakami⁴, Ken Nakajima⁵(1. Utokyo, 2. Former Hosei Univ., 3. Former TOSHIBA, 4. Nagaoka Univ. of Tech., 5. President of AESJ)

2021 Annual MeetingThu. Mar 18, 2021Download PDF

[2A09]Reactor Core Degradation and Relocation at Severe Accident(5)Temperature and Porosity Evaluation on SFD1-4 test

*Koji Nishida¹, Naoki Sano¹, Takayoshi Kusunoki¹, Mishio Murase¹(1. INSS)

2021 Annual MeetingThu. Mar 18, 2021Download PDF

[2A10]Heat Transfer and Thermal hydraulics Characteristics of Molten Fuel Pools in the Lower Head

*Akira Mikami¹, Marco Pellegrini¹, Ryo Yokoyama¹, Koji Okamoto¹(1. UTokyo)

2021 Annual MeetingThu. Mar 18, 2021Download PDF

[2A11]The evaluation of the material distribution in the solidified metal after molten metal spreading

*Ryo Yokoyama¹, Shunichi Suzuki¹, Masahiro Kondo², Masaru Harada³, Koji Okamoto¹(1. UTokyo, 2. AIST, 3. TEPCO)

2021 Annual MeetingThu. Mar 18, 2021Download PDF

[2A12]Detailed thermal-hydraulics simulation around a beam-window on ADS(2)Validation of analysis resuls by experiment

*Koki Asari¹, Hideaki monji¹, kenji nishihara², Hiroyuki Yoshida², Susumu Yamashita², Takayuki Suzuki²(1. University of Tsukuba, 2. JAEA)

2021 Annual MeetingThu. Mar 18, 2021Download PDF

[2A13]Detailed thermal-hydraulics simulation around a beam-window on ADS(3)Effect of nozzle shape

*Susumu Yamashita¹, Takanori Sugawara¹, Kenji Nishihara¹, Hiroyuki Yoshida¹(1. JAEA)

2021 Annual MeetingThu. Mar 18, 2021Download PDF

[2A14]Development of measurement method for concentration distribution of high electric-conductivity solution

*Tsugumasa Iiyama¹, Masahiro Furuya¹, Takahiro Arai¹(1. CRIEPI)

2021 Annual MeetingThu. Mar 18, 2021Download PDF

[2A15]Development of void fraction in 5x5 rod bundle during saturated pool boiling on periodic heating conditions

*Shota Ueda¹, Takahiro Arai¹, Masahiro Furuya¹, Riichiro Okawa¹, Atsushi Ui¹, Kenetsu Shirakawa¹(1. CRIEPI)

2021 Annual MeetingThu. Mar 18, 2021Download PDF

[2A16]Research and development for understanding two-phase flow behavior inside a fuel bundle(9)Void fraction distribution in a rod bundle with cosine axial power profile

*Takahiro Arai¹, Atsushi Ui¹, Masahiro Furuya¹, Riichiro Okawa¹, Kenetsu Shirakawa¹(1. CRIEPI)

2021 Annual MeetingThu. Mar 18, 2021Download PDF

[2A17]Research and development for understanding two-phase flow behavior inside a fuel bundle(10)Pressure fluctuation characteristics of the two-phase flow in a subchannel

*Masaki Ikeda¹, Kiyoshi Fujimoto¹, Kenichi Katono¹, Kenichi Yasuda¹, Atsushi Ui²(1. HGNE, 2. CRIEPI)

2021 Annual MeetingThu. Mar 18, 2021Download PDF

[3A01]Research and development for understanding of liquid-film flow behavior around fuel rods in BWRs’ fuel rod bundle(3)Measurement of liquid-film thickness on a single simulated fuel rod under atmospheric pressure condition using an optical waveguide sensor

*Hajime Furuichi¹, Kiyoshi Fujimoto¹, Kenichi Katono¹, Masaki Ikeda¹, Kenichi Yasuda¹, Kazuaki Kito¹(1. HGNE)

2021 Annual MeetingFri. Mar 19, 2021Download PDF

[3A02]Research and development for understanding of liquid-film flow behavior around fuel rods in BWRs’ fuel rod bundle(4)Experimental evaluation of effect on droplet and liquid-film behaviors in a wake flow of a simulated partial-length-rod under atmospheric pressure

*Kiyoshi Fujimoto¹, Hajime Furuichi¹, Kenichi Katono¹, Masaki Ikeda¹, Kenichi Yasuda¹, Kazuaki Kito¹(1. Hitachi GE Nuclear Energy, Ltd.)

2021 Annual MeetingFri. Mar 19, 2021Download PDF

[3A03]Transient boiling analysis in partially and rapidly heated 5X5 rod bundle with TRACE code

*Riichiro Okawa¹, Masahiro Furuya¹, Takahiro Arai¹, Tsugumasa Iiyama¹, Kenetsu Shirakawa¹(1. CRIEPI)

2021 Annual MeetingFri. Mar 19, 2021Download PDF

[3A04]Numerical simulation study on effect of vane on two-phase flow in the fuel bundle

*Ayako Ono¹, Susumu Yamashita¹, Takayuki Suzuki¹, Hiroyuki Yoshida¹(1. JAEA)

2021 Annual MeetingFri. Mar 19, 2021Download PDF

[3A05]Evaluation of Correlation in a CFD Model for Condensation Heat Transfer

*Michio Murase¹, Yoichi Utanohara¹, Shigeo Hosokawa², Akio Tomiyama²(1. Institute of Nuclear Safety System, Inc., 2. Kobe University)

2021 Annual MeetingFri. Mar 19, 2021Download PDF

[3A06]Effects of material of heat transfer surface on pool boiling heat transfer of nanofluid

*Koki Nakano¹, Yutaro Umehara¹, Yasuo Koizumi¹, Tomio Okawa¹(1. UEC)

2021 Annual MeetingFri. Mar 19, 2021Download PDF

[3A07]Numerical simulation of wall condensation of steam-air mixture in a circular tube and the effect of coarse computational grid

*Yoichi Utanohara¹, Michio Murase¹(1. INSS)

2021 Annual MeetingFri. Mar 19, 2021Download PDF

[3A08]Development of HTC Distribution near the Quenching Point during falling Liquid Film along high-temperature wall based on thermal-hydraulics phenomenon

*Yutaro Umehara¹, Tomio Okawa¹(1. UEC)

2021 Annual MeetingFri. Mar 19, 2021Download PDF

[3A_PL01]Activity report of the Special Committee on Advanced Hydrogen Safety

*Ken Muramatsu¹(1. TCU)

2021 Annual MeetingFri. Mar 19, 2021Download PDF

[3A_PL02]Approaches and technical issues of hydrogen behaviorial CFD analyses in Japan and overeas

*Masaaki Matsumoto¹(1. MRI)

2021 Annual MeetingFri. Mar 19, 2021Download PDF

[3A_PL03]Development of hydrogen safety evaluation using the CFD code system for analyzing hydrogen behavior

*Jiro Yoneda¹, *Yasutaka Harai¹, *Ryo Fukuda¹(1. MHI)

2021 Annual MeetingFri. Mar 19, 2021Download PDF

[3A_PL04]Public release of the CFD code system for analyzing hydrogen behavior

*Atsuhiko Terda¹(1. JAEA)

2021 Annual MeetingFri. Mar 19, 2021Download PDF

[3A09]Experimental evaluation of gas-liquid two phase flow and aerosol behavior during pool scrubbing

*Kohei Yoshida¹, Kota Fujiwara¹, Akiko Kaneko¹, Yutaka Abe¹(1. Univ. of Tsukuba)

2021 Annual MeetingFri. Mar 19, 2021Download PDF