【作者】 周彬；

【导师】 熊珍琴； 施伟；

【作者基本信息】 上海交通大学 ， 核能与核技术工程（专业学位）， 2017， 硕士

【摘要】 非能动安全壳冷却系统(Passive Containment Cooling System,PCS)作为第三代大型先进压水堆非能动专设安全设施中的重要组成部分,在发生设计基准事故后的72小时内,可以通过自然通风冷却、水膜蒸发冷却等非能动方式排出安全壳热量,且不需要任何操纵员操作。在某些厂址的极端气候条件下,厂址环境温度可能会降得很低。为了减小恶劣环境对电站安全运行的影响,核电站的最低环境设计温度为-40℃。因此,设计上要求非能动安全壳冷却系统的关键物项(如钢制安全壳、非能动安全壳冷却水箱(PCCWST)、PCS阀门间区域等),在极端低温条件下,即使丧失辅助加热设施,也依旧可以确保其功能,从而保证整个PCS系统可以在事故后为安全壳提供足够的冷却水。本文使用CFD软件分析了PCS关键物项随时间的温度变化过程,形成了极端低温条件下安全壳最低温度计算的分析方法、PCS阀门间区域防冻计算的分析方法、水箱非排水防冻分析模型,并最终使得PCS关键物项的设计可以在极端低温条件下保证其功能。更多还原

【Abstract】 The Passive Containment Cooling System as one of the important parts of the 3th large-scale advanced pressurized water reactor,should be capable to remove the heat from the containment with no operator’s action but only passive ventilating and evaporating during 72 hours after the design basis accidents.In some extreme weather condition,the site temperature might become very low.In order to diminish the adverse impact that the cold climate brings out on the safe operation of the nuclear power plant,the plant should be designed to endure the temperature of-40℃.Therefore,the critical items of PCS,such as containment steel vessel,passive containment cooling water storage tank(PCCWST),and the region of PCS valve room,should be designed to ensure the system function to provide enough cooling water to the containment on the cold climate without heating.The temperature change of the PCS critical items is analyzed by CFD.The analysis method and the calculation model of the containment vessel,the region of PCS valve room,the water tank are all developed in order to make sure the items can ensure their function under the extreme cold condition.更多还原