“华龙一号”通风系统冷凝水排水不畅问题分析及处理

The Analysis and Treatment for the Poor Condensate Drainage in the Ventilation System of HPR1000

针对“华龙一号”核电厂通风系统冷凝水经常无法顺利排走,造成通风系统冷冻机组箱体内部积水或者地面积水的问题,通过分析冷凝水产生的原理和排放的影响因素,结合华龙机组实际工程经验,查询统计核电厂信息管理系统中相关的工作申请,分析得出环境温湿度、水封的失效、排水路径存在问题是导致通风系统冷凝水排水不畅问题的三大主要因素。并从运行、维修等专业的角度分别给出了改变通风系统运行模式、增设临时除湿机、增加巡检频率与检查项目、通风系统投运后检查水封运行状况、改造接水盘、定期清理排水路径、向接水盘加药消杀排水路径等可行性建议,为后续华龙机组通风系统的冷凝水排放相关问题的运行巡视、维修检查保养等提供技术指导。

In view of the fact that the condensate in the ventilation system of HPR1000 nuclear power plant is often unable to be discharged smoothly,which resulting the problem of condensate accumulating inside the chiller of the ventilation system or on the ground,by analyzing the principle of condensate generation and the influencing factors of condensate drainage,combined with the actual engineering experience of HPR1000,querying and analyzing relevant work request in the information management system of nuclear power plant,it concludes that the ambient temperature and humidity,the failure of water seal,and drainage path problems are the three main factors resulting in the problem of poor condensate drainage in ventilation systems.Based on these three main factors,from the perspectives of operation,maintenance and other professions,the article provides several feasible suggestions,such as changing the ventilation system operation mode,using temporary dehumidifiers,increasing inspection frequency and check items,checking the operation status of the water seal after the ventilation system is put into operation,revamping the water receiving pan,regularly cleaning the drainage path and adding medicine to the water receiving pan for disinfecting the drainage path,which provides technical guidance for operation department inspections and maintenance department maintenance,etc.in the condensate discharge related problems of the ventilation system of HPR1000 in the future.