Resulting in a large amount of working fluid loss, high failure and low water level, which can easily cause tube bundle erosion and make it difficult to maintain the water level of the deaerator or condenser. By inquiring about the emergency drainage information of Gaojia Drainage Station, we learned that the emergency drainage operation of Gaojia Drainage Station will cause a large amount of working fluid loss, faulty Gaojia Drainage Station and low water level, which will easily cause tube bundle flushing and cause difficulty in water level of deaerator or condenser. The impact on maintenance is very large.