压水堆核电站低压安注泵压降系数智能化计算的研究

为了保证数据的同步时效性,测量参数由就地临时仪表更改为变送器采集,并在控制系统内将数据进行智能运算,进而测得低压安注泵吸入口压降系数。利用已知的低压安注泵从换料水箱吸水进行冷段注工况下流量与扬程,根据模型进行推演得到低压安注泵从核岛地坑吸水进行冷段注工况下流量与扬程,并对核岛地坑至泵吸入口的压降进行保守计算得到低压安注泵可用汽蚀余量。压水堆核电站低压安注泵地坑吸入口压降系数智能化计算的研究在智能电站系统得到成功应用,为研究核电站LOCA事故工况安注泵安全运行提供了重要的原始数据输入,数据精确、精准、可信。

Study on Intellectualized Pressure Drop Coefficient Calculation for LHSI Pump in PWR Nuclear Power Plants

In order to ensure the data synchronization, the measurement parameters are acquired from transmitters instead of local temporary instruments, and then computed in the control system to obtain the pressure drop coefficient at the intake of LHSI pump. In addition, using the known LHSI pump flow and head under RWST condition, the pump flow and head of the sump suction condition are derived according to the deduction model and the usable NPSHa is calculated conservatively by utilizing the pressure drop between the sump and the pump suction. The research of intelligent calculation on pressure drop coefficient at LHSI pump intake has been successfully applied in smart power stations, which can provide important original input with accurate and credible data for the study on LHSI pump safe operation in the event of the LOCA in nuclear power plants.