Exchange Flow Characteristics in a Tokamak Vacuum Vessel of Fusion Reactor Under the Loss-of-Vacuum Conditions |
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Authors: | Kazuyuki Takase Tomoaki Kunugi Yasushi Seki |
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Affiliation: | (1) Department of Reactor Engineering, Japan Atomic Energy Research Institute, 2-4 Shirakata, Tokai-mura, Ibaraki-ken, 319-11, Japan;(2) Department of Fusion Engineering, Japan Atomic Energy Research Institute, Naka-machi, Naka-gun, Ibaraki-ken, 311-01, Japan |
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Abstract: | When a Tokamak vacuum vessel of fusion reactor is broken, buoyancy-driven exchange flows will take place through breaches after the inside pressure of the vacuum vessel (VV) becomes equal to the outside pressure. The exchange flow may bring a mixture of activated dusts and tritium from the inside of the VV to the outside through the breaches. Moreover, the exchange flow may remove decay heat from the plasma-facing components. A preliminary LOVA (Loss Of VAcuum event) apparatus was constructed to investigate quantitative heat transfer characteristics of the exchange flows through the breaches under the LOVA conditions. The results of this study, the relationship between Froude numbers and breach locations in the VV was determined and empirical correlations for the average Froude numbers were derived. |
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Keywords: | LOVA fusion reactors exchange flows breaches Froude number empirical correlations |
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