岭澳核电站二期循环水泵泵坑被淹问题的处理

Handling of Flooding of Circulating Pump Pit in Ling'ao Phase Ⅱ Nuclear Power Station

岭澳核电站3号机组在进行125 V直流电源系统(LBA)失电试验(COC53)期间,由于LBA失电,导致循环水泵(3CRF001PO)泵坑内的排污泵无法启动实现自动排水,在失电长达6 h以上未能恢复供电,最终导致循环水泵下部径向轴承油室进水。针对此问题进行原因分析,并最终对排污泵的动力电源进行交叉供电的改造,以避免因单列电源失电而造成水淹设备的风险。

During the power test （COC53） for the 125 V DC power supply system （LBA） of Unit 3 of Ling＇ao Phase I[ Nuclear Power Station, due to the loss of electricity, the circulating water pump （3CRF001PO） sewage pump pit cannot start the automatic drainage. The power failed for more than 6 h, and the water entered in the lower radial bearing oil chamber of the water circulation pump. The reasons for this problem is analyzed, and the power supply for the sewage pump is rebuilt, to avoid the risk of equipment flooding caused by the single loss of power.