Two-phase flow experiments and analysis were conducted to understand two-phase flow behavior of the water scrubbing pool of the filtered containment venting system with steam injection. In the early phase of steam injection, the water level gradually increased due to the steam condensation where the water surface was stable. After the water pool reached the saturation temperature, the diameter of bubbles increased when the bubbles moved upward in the water pool, where fluctuation of the water surface was observed. The water level increased when the scrubbing pool was pressurized by an orifice. Our simulation results showed that the decrement of the bubble velocity due to the pressurization may promoted the level swell.

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