非能动安全壳冷却对严重事故下气溶胶沉积影响分析

摘要

采用分区法模型计算了不同热工条件下的气溶胶沉积情况，分析了4种自然沉积机理对不同粒径气溶胶的沉积作用。研究表明，气溶胶扩散泳沉积受热工情况影响最为显著。针对AP系列压水堆非能动安全壳冷却的设计特性，可通过降低壁面温度来提高气溶胶的扩散泳沉积，增强安全壳内的气溶胶净化作用，从而提高严重事故下安全壳内的放射性去除效果。%Aerosol deposition in different thermal conditions was calculated with section‐al method model ,and effects of four natural deposition mechanisms on various aerosol diameters were analyzed .The result shows that diffusiophoresis deposition of aerosol is the most affected by thermal condition .According to the feature of passive containment cooling of AP series pressurized water reactor ,the reduction of radioactivity in severe accident conditions can be enhanced through decreasing the temperature of containment wall to improve diffusiophoresis deposition of aerosol .