Abstract The containment filtered venting system(CFVS) filters the atmosphere of the containment building and discharges a part of it to the outside environment to prevent containment overpressure during severe accidents. The Korean CFVS has a tank that filters fission products from the containment atmosphere by pool scrubbing, which is the primary decontamination process; however, prediction of its performance has been done based on researches conducted under mild conditions than those of severe accidents. Bubble behavior in a pool is a key parameter of pool scrubbing. Therefore, the bubble behavior in the pool was analyzed under various injection flow rates observed at the venturi nozzles used in the Korean CFVS using a wire-mesh sensor. Based on the experimental results, void fraction model was modified using the existing correlation, and a new bubble size prediction model was developed. The modified void fraction model agreed well with the obtained experimental data. However, the newly developed bubble size prediction model showed different results to those established in previous studies because the venturi nozzle diameter considered in this study was larger than those in previous studies. Therefore, this is the first model that reflects actual design of a venturi scrubbing nozzle.

中文翻译：

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文丘里洗涤喷嘴对水池气泡行为的实验研究

摘要 安全壳过滤通风系统(CFVS)对安全壳建筑物内的大气进行过滤，并将部分空气排放到外界环境中，以防止发生严重事故时安全壳超压。韩国 CFVS 有一个罐，通过池洗涤从安全壳大气中过滤裂变产物，这是主要的净化过程；然而，它的性能预测是基于在温和条件下进行的研究而不是严重事故。池中的气泡行为是池清理的关键参数。因此，使用丝网传感器在韩国 CFVS 中使用的文丘里喷嘴处观察到的各种注入流量下，分析了水池中的气泡行为。根据实验结果，利用现有的相关性修改空隙率模型，并开发了一种新的气泡尺寸预测模型。修正后的空隙率模型与所得实验数据吻合良好。然而，新开发的气泡尺寸预测模型显示出与先前研究中建立的模型不同的结果，因为本研究中考虑的文丘里喷嘴直径大于先前研究中的那些。因此，这是第一个反映文丘里洗涤喷嘴实际设计的模型。