Nuclear Engineering and Technology

  • 제55권5호
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  • Pages.1742-1756
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  • 2023
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Large-eddy simulation on gas mixing induced by the high-buoyancy flow in the CIGMAfacility

  • Satoshi Abe (Thermohydraulic Safety Research Group, Nuclear Safety Research Center, Japan Atomic Energy Agency) ;
  • Yasuteru Sibamoto (Thermohydraulic Safety Research Group, Nuclear Safety Research Center, Japan Atomic Energy Agency)
  • 투고 : 2022.08.04
  • 심사 : 2023.01.16
  • 발행 : 2023.05.25
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초록

The hydrogen behavior in a nuclear containment vessel is a significant issue when discussing the potential of hydrogen combustion during a severe accident. After the Fukushima-Daiichi accident in Japan, we have investigated in-depth the hydrogen transport mechanisms by utilizing experimental and numerical approaches. Computational fluid dynamics is a powerful tool for better understanding the transport behavior of gas mixtures, including hydrogen. This paper describes a Large-eddy simulation of gas mixing driven by a high-buoyancy flow. We focused on the interaction behavior of heat and mass transfers driven by the horizontal high-buoyant flow during density stratification. For validation, the experimental data of the Containment InteGral effects Measurement Apparatus (CIGMA) facility were used. With a high-power heater for the gas-injection line in the CIGMA facility, a high-temperature flow of approximately 390 ℃ was injected into the test vessel. By using the CIGMA facility, we can extend the experimental data to the high-temperature region. The phenomenological discussion in this paper helps understand the heat and mass transfer induced by the high-buoyancy flow in the containment vessel during a severe accident.

키워드

과제정보

The construction of the CIGMA facility and the experiments in this work were conducted under the auspices of the Nuclear Regulation Authority, Japan. The authors acknowledge Mr. Mashiko, Mr. Miyo, Mr. Kobayashi, Mr. Ebisawa, and Mr. Massaki of the Nuclear Engineering Company Inc. (NECO), and Mr. Ohwada and Mr. Hangai of JAEA for performing the CIGMA experimental project. Mr. Ohmiya of KCS Corporation for postprocessing the experimental data. The CFD simulation was conducted using the supercomputer HPE SGI8600 in JAEA.

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