PCS系统作用下的安全壳内部大气流动与传热行为研究

Research on Gas Behavior of Flow and Heat Transfer in Containment with the Effect of PCS

先进压水堆核电厂普遍设有非能动安全系统以导出事故后安全壳内部热量,俄罗斯AES-2006型反应堆采用了开式自然循环回路的非能动安全壳冷却系统(PCS),对该类PCS系统作用下的安全壳内部大气流动与传热行为进行了数值模拟研究。研究结果表明,PCS系统下部的安全壳区域存在着由于冷凝作用产生的气体流动,PCS系统以上的安全壳区域的气体流动相对滞止;水蒸汽质量和温度在高度方向上呈层状分布,水平方向上则分布均匀;在计算时间段内,PCS系统的冷凝速率维持在了一个相对恒定的数值。本文的研究有助于国内自主先进压水堆PCS系统的研发设计。

Passive safety systems are widely used to remove heat inside containment in advanced PWR nuclear power plants, passive containment cooling system （PCS） based on open natural circulation scheme is introduced to Russia AES-2006 reactor. Gas flow and heat transfer in containment with effect of this kind of PCS is numerically investigated in this paper. The results indicate that： gas flows downwards with the effect of condensation in containment area below PCS while gas flow in the area above PCS is stagnant; vapor mass fraction and mixture temperature is stratified in vertical direction while the distribution is homogeneous; PCS condensation rate remains nearly constant during the whole simulation time. Research in this paper benefits the research and design of PCS for domestic advanced PWR.