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反应堆的发热是靠反应堆系统一回路冷却剂循环带出堆芯之外的。一般情况下，冷却剂的流动是靠冷却剂主循环泵（主泵）来唧送的，特殊情况下，也需要靠回路中冷却剂的自然循环流动来完成。不论是哪种情况，主泵的流量特性直接影响着反应堆的安全。本文根据主泵的四象限特性图提出了一种用于计算反应堆系统稳态和瞬态工况下主泵流量特性的计算方法。该方法便于使用，其计算结果与Ｒｅｌａｐ５／ＭＯＤ２的计算结果进行了比较，二者符合很好，证明本文的模型完全可用于反应堆系统的稳态设计和瞬态事故分析。
Reactor heat is generated by the first loop of the reactor system coolant circulation out of the core. Under normal circumstances, the coolant flow is based on the coolant main circulating pump (pump) to pump, under special circumstances, also need to rely on the loop of the natural circulation of coolant to complete. In either case, the flow characteristics of the main pump directly affect the safety of the reactor. Based on the four-quadrant characteristic diagram of the main pump, this paper presents a calculation method for calculating the main pump flow characteristics under steady state and transient conditions of the reactor system. The method is easy to use and its calculation results are compared with the results of Relap5 / MOD2. The two are in good agreement, which proves that the model in this paper can be fully used in steady state design and transient accident analysis of reactor system.