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广东大亚湾核电站 1号机组在维修或冷停堆换料期间，停堆余热冷却系统的化学容积控制系统净化流量严重不足，远远低于设计要求。而该净化流量在电站维修或冷停堆期间起着非常大的作用，改进停堆余热冷却系统，提高化学容积控制系统净化流量成了当务之急。为了确保改进后的停堆余热冷却系统-化学容积控制系统能提供满足系统手册要求的净化流量，本文用 RELAP5/MOD3程序计算分析了大亚湾核电站 1号机组停堆余热冷却系统-化学容积控制系统改进前后的热工水力特性，为制定停堆余热冷却系统-化学容积控制系统的改进方案提供了依据。
During the maintenance or cold shutdown of refueling for Unit 1 of Daya Bay Nuclear Power Station in Guangdong, the purge flow of the chemical volume control system of the residual heat recovery cooling system is seriously insufficient and far below the design requirements. The purge flow plays a very important role during power station maintenance or cold shutdown. Improving the cooling system of the reactor waste heat and increasing the clean flow of the chemical volume control system have become urgent tasks. In order to ensure that the improved shutdown waste heat cooling system - chemical volume control system can provide purifying flow to meet the system manual requirements, this paper calculated and analyzed the shut-down waste heat cooling system of Unit 1 of Daya Bay Nuclear Power Station using a RELAP5 / MOD3 program - Chemical Volume Control System Improvement Before and after the thermal hydraulic properties, for the development of shutdown waste heat cooling system - chemical volume control system provides an improved program.