浮动核电站给水系统瞬态分析

Analysis on Transient Working Conditions for Main Water Feeding System of Floating Nuclear Power

摘要: 基于浮动核电站主给水系统，利用Flowmaster仿真软件建立了从除氧器出口至蒸汽发生器出口的给水系统模型。对给水系统四种瞬态过程中蒸汽发生器的水量变化进行分析：额定工况下一台给水泵跳闸，备用泵连锁启动；额定工况下一台给水泵跳闸，备用泵连锁启动失败；带零负荷时主给水调节阀故障全开；带满负荷时主给水调节阀故障全开。仿真结果表明，在给水泵切换瞬态工况下，蒸汽发生器的失水量在要求的范围内，不会触发反应堆跳停。并且根据瞬态工况的蒸汽发生器上水量的变化曲线，得到了保守的给水流量值作为核岛安全分析的输入，确保这些瞬态工况下堆芯不发生DNB。

Abstract: Based on the floating nuclear power plant main water feeding system, the water feeding process model from the outlet of deaerator to the outlet of the steam generator is established by using a one-dimensional fluid simulation software Flowmaster. The change of water quantity of steam generator in four transient processes of water supply system is analyzed, includes: a water pump trip in rated state, and standby pump interlock start; a water pump trip in rated state, and standby pump interlock start; main feed-regulating valve is in full open due to failure under no load; main feed-regulating valve is in full open due to failure under full load. The simulation results show that: steam generator water level changes within the scope of the requirements under the feed pump switching transient conditions, which cannot trip the reactor. And according to steam generator water supply curves under the transient conditions, the conservative water flow value is obtained, which is an input to the nuclear island safety analysis, and to make sure the reactor core do not departure from nucleate boiling under these transient conditions.