直流蒸汽发生器分组运行对流动不稳定的影响

Research on Influence to Flow Instability of OTSG Under Group Operation Mode

一体化压水堆通常采用多个直流蒸汽发生器(OTSG),在特定运行条件下,OTSG二次侧会出现流动不稳定现象,如何避免流动不稳定现象的发生是保证OTSG安全、稳定运行的难题。由于OTSG的流动不稳定出现在一定的运行区域,在低负荷时可采用OTSG分组方式运行,以保证运行的OTSG不发生流动不稳定现象。本工作采用RELAP5/MOD3.4程序对系统的运行特性进行分析,在讨论分组运行避开流动不稳定现象的同时,对OTSG分组运行模式在一体化压水堆核动力装置快速变负荷过程中的应用进行了特性研究。结果表明,OTSG分组运行方案可有效地避开流动不稳定区间,保证一体化压水堆核动力装置低负荷工况稳定运行。

Integrated pressurized water reactor （IPWR） owns more than one once- through steam generators （OTSGs）. Flow instability may occur in secondary side of OTSG under certain conditions. Trying to avoid the occurrence of flow instability is of great importance for the safe and stable operation of OTSG. Because of the fact that flow instability often occurs in certain regions, so when OTSGs operate with low load, OTSGs can be divided into several groups, which can avoid flow instability. Operational characteristics of IPWR were analyzed by RELAPS/MOD3.4 code and during the discussion of group operation, a rapid change load operation scheme using OTSG group operation mode which could be used in IPWR was analyzed. The results show thatOTSG group operation mode can effectively avoid flow instability, which can ensure IPWR operate stably under low load condition.