Oral presentation

[1A01-06] Fukushima Daiichi NPS Accident

Wed. Mar 17, 2021 10:15 AM - 12:00 PM Room A (Zoom room 1)

Chair: Hotta Akitoshi (NRA)

10:15 AM - 10:30 AM

[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)

10:30 AM - 10:45 AM

[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.)

10:45 AM - 11:00 AM

[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.)

11:00 AM - 11:15 AM

[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)

11:15 AM - 11:30 AM

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

Estimation of FP behaviors using SAMPSON code

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

11:30 AM - 11:45 AM

[1A06] Temperature change due to radiative cooling under the fuel rod exposure in Fuku-Ichi No.1 Reactor

Recursive calculation of temperature using a simplified 3-D(2)

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

Time reserved for Chair （11:45 AM - 12:00 PM）

Oral presentation

[1A07-11] Gas-liquid Two-phase Flow

Wed. Mar 17, 2021 2:45 PM - 4:15 PM Room A (Zoom room 1)

Chair: Ayako Ono (JAEA)

2:45 PM - 3:00 PM

[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.)

3:00 PM - 3:15 PM

[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.)

3:15 PM - 3:30 PM

[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.)

3:30 PM - 3:45 PM

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

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

3:45 PM - 4:00 PM

[1A11] Development of a System Analysis Code for NPP

(3)Code Validation Based on Void Fraction Measurement Tests

*Junichi Kaneko¹, Naofumi Tsukamoto¹ (1. NRA)

Time reserved for Chair （4:00 PM - 4:15 PM）

Oral presentation

[2A01-04] Thermal Hydraulics of Fast Reactors

Thu. Mar 18, 2021 9:30 AM - 10:45 AM Room A (Zoom room 1)

Chair: Hiroyasu MOCHIZUKI (Tokyo Tech)

9:30 AM - 9:45 AM

[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)

9:45 AM - 10:00 AM

[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)

10:00 AM - 10:15 AM

[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)

10:15 AM - 10:30 AM

[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)

Time reserved for Chair （10:30 AM - 10:45 AM）

Oral presentation

[2A05-08] Severe Accident 1

Thu. Mar 18, 2021 10:45 AM - 12:00 PM Room A (Zoom room 1)

Chair: Akifumi Yamaji (Waseda Univ.)

10:45 AM - 11:00 AM

[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)

11:00 AM - 11:15 AM

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

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

11:15 AM - 11:30 AM

[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)

11:30 AM - 11:45 AM

[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)

Time reserved for Chair （11:45 AM - 12:00 PM）

Oral presentation

[2A09-11] Severe Accident 2

Thu. Mar 18, 2021 2:45 PM - 3:40 PM Room A (Zoom room 1)

Chair: Yasunori Yamamoto (Hokkaido Univ.)

2:45 PM - 3:00 PM

[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)

3:00 PM - 3:15 PM

[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)

3:15 PM - 3:30 PM

[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)

Time reserved for Chair （3:30 PM - 3:40 PM）

Oral presentation

[2A12-14] Thermal Hydraulic Experiment/Analysis

Thu. Mar 18, 2021 3:40 PM - 4:35 PM Room A (Zoom room 1)

Chair: Masaaki Tanaka (JAEA)

3:40 PM - 3:55 PM

[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)

3:55 PM - 4:10 PM

[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)

4:10 PM - 4:25 PM

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

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

Time reserved for Chair （4:25 PM - 4:35 PM）

Oral presentation

[2A15-17] Fuel Assembly Thermal Hydraulics 1

Thu. Mar 18, 2021 4:35 PM - 5:30 PM Room A (Zoom room 1)

Chair: Hiroyuki Yoshida (JAEA)

4:35 PM - 4:50 PM

[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)

4:50 PM - 5:05 PM

[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)

5:05 PM - 5:20 PM

[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)

Time reserved for Chair （5:20 PM - 5:30 PM）

Oral presentation

[3A01-04] Fuel Assembly Thermal Hydraulics 2

Fri. Mar 19, 2021 9:30 AM - 10:45 AM Room A (Zoom room 1)

Chair: Yoichi Utanohara (INSS)

9:30 AM - 9:45 AM

[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)

9:45 AM - 10:00 AM

[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.)

10:00 AM - 10:15 AM

[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)

10:15 AM - 10:30 AM

[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)

Time reserved for Chair （10:30 AM - 10:45 AM）

Oral presentation

[3A05-08] Boiling, Condensation, Heat Transfer

Fri. Mar 19, 2021 10:45 AM - 12:00 PM Room A (Zoom room 1)

Chair: Yasunori Yamamoto (Hokkaido Univ.)

10:45 AM - 11:00 AM

[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)

11:00 AM - 11:15 AM

[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)

11:15 AM - 11:30 AM

[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)

11:30 AM - 11:45 AM

[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)

Time reserved for Chair （11:45 AM - 12:00 PM）

Oral presentation

[3A09-12] Liquid Droplet & Aerosol

Fri. Mar 19, 2021 2:45 PM - 4:00 PM Room A (Zoom room 1)

Chair: Yoshiro Nishioka (Toshiba ESS)

2:45 PM - 3:00 PM

[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)

3:00 PM - 3:15 PM

[3A10] Study on Evaluation Method for Aerosol Particle Behavior in a Reactor Building

(1)Main points and progresses of benchmark analysis on aerosol behavior in the reactor building Fukushima unit 2

*Koichi Nakamura¹, Takashige Sekiguchi², Naoki Horiguchi³, Masashi Himi¹, Shinichiro Uesawa³, Hiroyuki Yoshida³, Satoshi Nishimura¹ (1. Central Research Institute of Electric Power Industry, 2. AdvanceSoft Corporation, 3. Japan Atomic Energy Agency)

3:15 PM - 3:30 PM

[3A11] Study on Evaluation Method for Aerosol Particle Behavior in a Reactor Building

(2)Effects of node division with MAAP on aerosol behavior in the reactor building

*Takashige Sekiguchi¹, Koichi Nakamura², Naoki Horiguchi³, Masashi Himi², Shinichiro Uesawa³, Hiroyuki Yoshida³, Satoshi Nishimura² (1. AdvanceSoft, 2. CRIEPI, 3. JAEA)

3:30 PM - 3:45 PM

[3A12] Study on Evaluation Method for Aerosol Particle Behavior in a Reactor Building

(3)Evaluation of Aerosol Particle Behavior based on CFD Simulation, and Effect of Gas Flow Rate and Particle Diameter

*Naoki Horiguchi¹, Koichi Nakamura², Takashige Sekiguchi³, Shinichiro Uesawa¹, Masashi Himi², Hiroyuki Yoshida¹, Satoshi Nishimura² (1. JAEA, 2. CRIEPI, 3. AdvanceSoft)

Time reserved for Chair （3:45 PM - 4:00 PM）

Sessions

III. Fission Energy Engineering » 304-1 Thermal Hydraulics, Energy Conversion, Energy Transfer, Energy Storage

[1A01-06] Fukushima Daiichi NPS Accident

(6)Overview and Preliminary Criticality Evaluation of the Unit-3 Pedestal Debris

(7)Preliminary evaluation of debris relocation and interaction with pedestal structures in Fukushima Unit-3 with MPS method

(8)Specific heat of Fe-B molten alloy

(1)Summary of the Accident Scenario Investigation using SAMPSON code

Estimation of FP behaviors using SAMPSON code

Recursive calculation of temperature using a simplified 3-D(2)

[1A07-11] Gas-liquid Two-phase Flow

(3)Code Validation Based on Void Fraction Measurement Tests

[2A01-04] Thermal Hydraulics of Fast Reactors

(4)Effect of heat generation condition on natural convection flow field in reactor vessel.

[2A05-08] Severe Accident 1

(9)3D Measurement of Liquid Film Behavior and Fragment

(1)Jet breakup and melt spread behaviors

(2)Melt penetration behavior

[2A09-11] Severe Accident 2

(5)Temperature and Porosity Evaluation on SFD1-4 test

[2A12-14] Thermal Hydraulic Experiment/Analysis

(2)Validation of analysis resuls by experiment

(3)Effect of nozzle shape

[2A15-17] Fuel Assembly Thermal Hydraulics 1

(9)Void fraction distribution in a rod bundle with cosine axial power profile

(10)Pressure fluctuation characteristics of the two-phase flow in a subchannel

[3A01-04] Fuel Assembly Thermal Hydraulics 2

(3)Measurement of liquid-film thickness on a single simulated fuel rod under atmospheric pressure condition using an optical waveguide sensor

(4)Experimental evaluation of effect on droplet and liquid-film behaviors in a wake flow of a simulated partial-length-rod under atmospheric pressure

[3A05-08] Boiling, Condensation, Heat Transfer

[3A09-12] Liquid Droplet & Aerosol

(1)Main points and progresses of benchmark analysis on aerosol behavior in the reactor building Fukushima unit 2

(2)Effects of node division with MAAP on aerosol behavior in the reactor building

(3)Evaluation of Aerosol Particle Behavior based on CFD Simulation, and Effect of Gas Flow Rate and Particle Diameter

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