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Effects of breach size and dust density on activated dust mobilization in ITER during a loss-of-vacuum event

Kazuyuki Takase2002年Fusion Engineering and DesignIF 1.7出版社

AbstractActivated dust mobilization in the International Thermonuclear Experimental Reactor (ITER) during a loss-of-vacuum-accident event (LOVA) was analyzed numerically by three-dimensional computations using a newly developed analysis code. A physical model on the motion of dust was proposed to resolve the dust transport conveyed by the fluid. Air ingress behavior through a breach at the LOVA was also calculated. In the present study, effects of breach size and dust density on activated dust mobilization in ITER during the LOVA were clarified quantitatively. From the present results, it was found that the saturation time in a vacuum vessel (VV) of ITER after the LOVA occurred depends on the breach size and then the mobilized dust fraction of beryllium, carbon, stainless steel, copper, and tungsten, which are VV component materials, were 1.7, 0.7, 0.5, 0.4 and 0.1%, respectively.

日本語訳

Abstract活性化ダストの移動は、国際熱核融合実験炉(ITER)における真空喪失事故(LOVA)時に、新たに開発した解析コードを用いた三次元計算により数値的に解析された。流体によって輸送されるダストの移動を解明するために、ダストの運動に関する物理モデルが提案された。LOVA時の破口を通じた空気の流入挙動も計算された。本研究では、LOVA中のITERにおける破口サイズとダスト密度が活性化ダストの移動に及ぼす影響が定量的に明らかにされた。本研究の結果から、LOVA発生後のITERの真空容器(VV)内の飽和時間は破口サイズに依存することが判明し、VV構成材料であるベリリウム、炭素、ステンレス鋼、銅、タングステンの移動ダスト割合はそれぞれ1.7%、0.7%、0.5%、0.4%、0.1%であった。

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