2419 核融合炉真空境界破断時の空気侵入挙動解析

概要

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If a loss-of-vacuum event (LOVA) occurs in a fusion experimental reactor, air may flow from the outside of a vacuum vessel (VV) through breaches into the inside and the air will be heated with decay heat. After the inside pressure of the VV is equivalent to the outside pressure, exchange flows through the breaches will occur because of the fluid density difference between the inside and outside of the VV. As a result of that, the activated dust particles accumulated inside the VV may be conveyed by the exchange flows to the outside of the VV. Then, the dust transport and air ingress behavior during a LOVA event was analyzed numerically from the viewpoint of the safety design of the fusion reactors. The predicted average pressure in VV after the LOVA event occurred was in good agreement with the experimental results. Numerical analyses were carried out for different breach positions such as a single and double breach cases and different particle densities such as beryllium, carbon, stainless steel and tungsten. An effect of the breach position on the dust transport were clarified quantitatively.
2000-07-31