非能动安全壳冷却系统DBC工况下流动传热特性研究  

Study on the Flow and Heat Transfer Characteristics of the Passive Containment Cooling System Under DBC

作　　者：梁潇 肖术芳 陶俊 谢小飞 LIANG Xiao;XIAO Shufang;TAO Jun;XIE Xiaofei(Hualong Nuclear Power Technology Corporation Ltd,Beijing 100089,China)

机构地区：[1]华龙国际核电技术有限公司,北京100089

出　　处：《核科学与工程》2024年第2期385-394,共10页Nuclear Science and Engineering

摘　　要：拓展非能动安全系统的应用场景、简化安全系统及支持系统的设计、提高电厂经济性是三环路压水堆优化创新的主要方向之一,使用非能动安全壳冷却系统(PCS)应对设计基准工况(DBC)是重要技术选项,在DBC工况下利用PCS有效导出安全壳内热量,使安全壳内温度、压力及相应的放射性释放满足限值要求。本文基于三环路压水堆开式非能动安全壳冷却系统,采用RELAP/SCDAP-SIM程序建模,开展该系统在DBC工况下的流动传热特性研究,分析影响该系统应对DBC可行性的关键因素。研究结果表明,在不改变换热器形式的情况下,为了应对DBC工况,换热器传热管数量与严重事故工况相比将增加约2.5倍,该系统在安全壳内的布置成为限制其可行性的关键因素。传热管管径和壁厚对系统自然循环能力和导热功率影响较小。系统冷热芯位差不能过高,否则无法建立有效的自然循环。蒸汽冷凝换热系数是系统导热功率的关键影响因素,有必要开展在DBC环境条件下安全壳内蒸汽冷凝换热实验,获得与真实条件更加符合的换热系数。本文研究成果为PCS应对DBC相关的系统、换热器设计及工程验证提供参考。Expanding the application scenario of the passive safety system,simplifying the design of safety systems and support systems,and improving the economy of plant is one of the main objectives of optimization and innovation of three-loop PWR.Using the passive containment cooling system(PCS)to cope with DBC is an important technical option.PCS can effectively remove the heat in the containment under DBC,to make sure that the temperature,pressure and corresponding release of radioactivity from the containment are under the limiting requirements.RELAP/SCDAP-SIM was used to the PCS model of three-loop PWR,and the flow and heat transfer characteristics of the system during DBC were studied.The key factors of effecting feasibility of the PCS coping with DBC were analyzed.The results show that,the number of heat exchanger tubes should increase about 2.5 times comparing with severe accident condition to cope with the DBC without changing the form of the heat exchanger.The arrangement of the PCS in the containment becomes the key limiting factor of its feasibility.The diameter and wall thickness of the heat transfer tubes have little influence on the natural circulation capacity and heat transfer power of the system.The distance between the heat exchanger and cooling pool should not be too high,otherwise effective natural circulation cannot be established.The condensation heat transfer coefficient had significant influence on the heat transfer power of the system.It is necessary to carry out corresponding experiments to obtain the heat transfer coefficient which is more consistent with the practical conditions.The results provide reference for the design of system and heat exchanger and engineering verification of the PCS to cope with the DBC.

关 键 词：非能动安全壳冷却系统 流动传热特性 设计基准工况 

分 类 号：TL331[核科学技术—核技术及应用]