プールスクラビングにおける蒸気凝縮が気液二相流挙動に及ぼす影響

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  • Effect of Steam Condensation for Gas-Liquid Two-Phase Flow Behavior during Pool Scrubbing

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<p>In severe accidents of nuclear power plants, radioactive contaminated gases are to be released to out of facilities after a process of passing through a water pool such as a suppression pool of BWRs. When the gases pass through a suppression pool, the radioactive aerosols are expected to be trapped in the pool. This decontamination effect is called “pool scrubbing”. Pool scrubbing is considered to have a great decontamination effect. In the severe accident analysis code called MELCOR, the decontamination factor of pool scrubbing is calculated under the gas-liquid two-phase flow model which has some assumptions. But the validity of this model is not sufficiently confirmed. Therefore, the assessment of the flow model in MELCOR is necessary for the proper nuclear regulation. In this study, the flow model was evaluated by the detailed measurements of flow in a test water tank. The flow structures of air jet and air-steam mixture jet were injected to the tank and measured by a wire mesh sensor. The void fraction data obtained by the WMS was converted to the bubble size data. The bubble size data was processed with Gaussian Mixture Model. As a results, it was confirmed that some differences of the bubble size occurred by the presence of steam and subcooling temperature.</p>

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