核动力装置强迫循环与自然循环过渡过程特性研究

针对某型压水堆核动力装置,建立反应堆及一回路系统强迫循环与自然循环的计算分析模型,并与试验值进行比较,验证了建立的模型计算精度高,满足工程分析的要求.利用建立的数学模型,对自然循环与强迫循环过渡过程进行分析计算,结果表明:强迫循环向自然循环转换过程中冷却剂流量、蒸汽发生器压力、反应堆出口温度是几个约束参数;自然循环向强迫循环的转换过程中反应堆功率变化与周期变化幅度较大.

Study on operation characteristics of natural circulation and forced circulation in nuclear power plant

The computing and analytic models between natural circulation and forced circulation are established for Pressurized Water Reactor(PWR) and Reactor Coolant System(RCS) in one type of Nuclear Power Plant(NPP).The models are highly precise by comparison between the calculation results,and experimental values and can meet the need of engineering analysis.Using the established mathematic models,the paper analyzes and calculates the transition process of natural circulation and forced circulation.The results indicate that,whether the natural circulation can be successfully established from forced circulation to natural circulation or not depends on several restrictive parameters,such as the core coolant flow,pressure of pressurizer and the temperature of core outlet,and that the reactor power and period change greatly during the transition from natural circulation to forced circulation.