AbstractAn integrated ICE (Ingress-of-Coolant Event) test facility was constructed in order to demonstrate the adequacy of the ITER (International Thermonuclear Experimental Reactor) safety design approach and investigate two-phase flow behavior during an ICE event. The integrated ICE test facility corresponds to approximately 1/1600 of the ITER components. In the experiments the fluid flow configurations inside the vacuum vessel at the ICE events were observed visually and pressure transients were measured quantitatively. Two-phase flow analyses were carried out with the TRAC code and the experimental results were validated numerically. From the present study it was clarified that the ITER pressure suppression system is very effective in reducing the pressure rise in case of the ICE event and the water–vapor two-phase flow characteristics in ITER can be predicted numerically with sufficient accuracy.
統合ICE（冷却材流入事象）試験施設は、ITER（国際熱核融合実験炉）の安全設計アプローチの妥当性を実証し、ICE事象中の二相流挙動を調査するために建設された。統合ICE試験施設は、ITER構成要素の約1/1600のスケールに相当する。実験では、ICE事象中の真空容器内の流体流動構成を視覚的に観察し、圧力過渡現象を定量的に測定した。二相流解析はTRACコードを用いて実施され、実験結果は数値的に検証された。本研究から、ITERの圧力抑制システムはICE事象時の圧力上昇を低減する上で非常に効果的であり、ITERにおける水–蒸気二相流特性は十分な精度で数値予測可能であることが明らかになった。