ACP100除氧器运行仿真及在二回路系统事故工况下的响应分析

Operation Simulation of ACP100 Deaerator and Response Analysis under Accident Conditions of Secondary Circuit System

摘要: 在小型模块化反应堆(SMR)中，二回路系统小型化导致除氧器需稳压运行才能维持机组的稳定。本文根据ACP100二回路系统特点，建立除氧器稳压运行仿真模型。同时，还建立二回路系统模型，研究在机组功率变化和事故工况下，该控制方式对二回路系统的影响。结果表明，除氧器稳压运行控制方式，能够实现对除氧器压力和给水温度的控制，验证了在单模块机组中除氧器稳压运行的可行性。针对事故工况分析表明，循环水泵跳泵和低压加热器解列会对除氧器压力和给水温度造成影响，而在低压加热器解列工况中3号加热器的解列比1，2号加热器解列对除氧器和二回路运行产生的影响更大，因此在后续机组运行中应对3号加热器重点关注。

Abstract: In the small modular reactor (SMR), the miniaturization of the secondary circuit system leads to the need for constant pressure operation of the deaerator to maintain the stability of the unit. According to the characteristics of ACP100 secondary circuit system, a simulation model of deaerator stable pressure operation is established in this paper. At the same time, the secondary system model is also established to study the influence of the control mode on the secondary system under the unit power change and accident conditions. The results show that the deaerator pressure stabilizing operation control mode can realize the control of deaerator pressure and feed water temperature, which verifies the feasibility of deaerator pressure stabilizing operation in single module unit. According to the analysis of accident conditions, the trip of circulating water pump and the disconnection of low-pressure heater will have an impact on the deaerator pressure and feed water temperature, while the disconnection of LPH3 has a greater impact on the operation of deaerator and secondary circuit than that of LPH1 and LPH2 in the disconnection condition of low-pressure heater, so the attention of LPH3 should be paid to in the subsequent unit operation.