AbstractNumerical analyses were carried out to predict quantitatively the condensation characteristics between the water and vapor inside a suppression tank in the International Thermonuclear Experimental Reactor (ITER). The suppression tank is one of the ITER safety devices. The pressure rise in an ITER vacuum vessel during an ingress-of-coolant event (ICE) is suppressed by the effect of condensation of vapor in the suppression tank. The water–vapor two-phase flow characteristics with condensation under the ITER pressure conditions were clarified numerically. Moreover, flow visualization experiments were carried out to understand the condensation behavior under low pressure and cold water. The predicted flow configurations agreed well with the experimental results.
Abstract 国際熱核融合実験炉（ITER）の圧力抑制タンク内における水と蒸気の間の凝縮特性を定量的に予測するために，数値解析を実施した。圧力抑制タンクは，ITERの安全装置の1つである。冷却材侵入事象（ICE）時におけるITER真空容器内の圧力上昇は，圧力抑制タンク内での蒸気の凝縮効果によって抑制される。ITER圧力条件下での凝縮を伴う水－蒸気二相流動特性を数値的に明らかにした。さらに，低圧・冷水条件下での凝縮挙動を理解するために，流れの可視化実験を実施した。予測された流動形態は実験結果とよく一致した。