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首页> 外文期刊>Thermal engineering >The Impact of Cesium Vapor Bulk Condensation on the Transport of Aerosols in the Reactor Plant's Primary Circuit during a Severe Accident at a Nuclear Power Plant with VVER
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The Impact of Cesium Vapor Bulk Condensation on the Transport of Aerosols in the Reactor Plant's Primary Circuit during a Severe Accident at a Nuclear Power Plant with VVER

机译：vver核电站核电站严重事故中反应器厂初级回路中气溶胶在核电厂的严重事故中的影响

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Abstract— The article presents the results from numerical modeling of aerosol particles' deposition process during their transportation in the horizontal section of the reactor plant’s primary circuit model for the conditions typical for a severe accident at an NPP equipped with VVER reactors. The effect that the bulk condensation of cesium vapors has on the growth and deposition of aerosols during their transportation is analyzed. The influence of the initial size and concentration of aerosol particles on their growth rate and subsequent deposition is considered. Homogeneous condensation occurring in the absence of heterogeneous condensation nuclei (solid aerosol particles) and also heterogeneous condensation under the conditions in which nuclei of the new phase do not emerge according to the homogeneous mechanism are considered as the limit cases. Data on the average size of the produced droplets and aerosol particles along the channel axis in the condensation zone with the varied value of aerosol particles mass fraction in the flow have been obtained, which corresponded to different ratios of the condensate mass fraction in the form of droplets and liquid layer on the surface of solid aerosol particles. It has been established that the general deposition rate decreases if the flow contains droplets generated as a result of homogeneous bulk condensation and having a size smaller than the size of grown aerosol particles. The article describes the analysis scheme of the modeled section whose geometrical shape was specified based on the horizontal section of the experimental installation in the FALCON-ISP1 series of experiments on the deposition and transport of radionuclide aerosols. The cesium vapor homogeneous-heterogeneous condensation process is modeled by numerically solving—using the method of moments—the kinetic equation for the droplet size distribution function with involvement of the authors’ COND-KINET-1 computer program. The transport and deposition of aerosol particles in the primary circuit channel were modeled using the MAVR-TA computer code developed at the National Research Center Kurchatov Institute.
机译：摘要 - 该物品在反应器厂的主要电路模型的水平段运输过程中介绍了气溶胶颗粒的沉积过程的数值模拟结果，以便在配备VVER反应堆的NPP中典型的典型条件。分析了铯蒸汽的散装缩合对运输过程中气溶胶沉积的影响。考虑了初始尺寸和气溶胶颗粒浓度对其生长速率和随后沉积的影响。在不存在异质缩合核（固体气溶胶颗粒）的情况下发生均匀缩合，并且在新阶段的核不会根据均匀机制出现的条件下，非均相冷凝被认为是极限情况。已经获得了沿着沟道轴的产生的液滴和气溶胶颗粒的平均尺寸的数据，其流动中的气溶胶颗粒质量分数的变化具有变化，其对应于缩合物质量分数的不同之处固体气溶胶颗粒表面上的液滴和液体层。已经确定，如果流量含有由于均相散装缩合而产生的液滴，并且尺寸小于生长的气溶胶颗粒的尺寸，则已经确定了一般沉积速率。本文介绍了模型部分的分析方案，其几何形状是基于实验装置的水平部分，在Falcon-ISP1系列实验中关于放射性核素气溶胶的沉积和运输。通过数值求解的瞬间 - 使用作者的COND-KINET-1计算机程序的参与，通过数值求解铯型均匀 - 异质凝结过程。使用在国立研究中心Kurchatov Institute开发的MAVR-TA计算机代码进行建模初级回路通道中的气溶胶颗粒的运输和沉积。

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