摘要
核电站在运行过程中产生大量腐蚀活化产物,这些腐蚀活化产物在氧化停堆后,随一回路冷却剂进入放射性水池。核查福清核电历次大修测量数据发现,这些辐射源项造成放射性水池环境剂量率水平普遍高于2 mSv/h,排水管线及设备热点接触剂量率大于300 mSv/h。分析一回路源项、放射性水池及相关管线γ剂量率水平、排水过程中的相关问题,并对比使用外接动力装置后放射性水池及其排水管线和下游地坑剂量率变化,结果表明放射性水池排水过程中沉积的源项是产生热点和剂量贡献的主要原因,通过使用外接动力装置,可有效提高排水速率,并增加高剂量率物质过滤和相关管线源项转移功能,大幅度改善了放射性水池排水过程中的剂量率水平。该实践为放射性水池排水过程中辐射水平控制和异常处理提供了新的视角,该方案可推广到所有核电厂放射性水池排水过程的辐射水平控制。
Nuclear power plants produce a large number of corrosion activation products during operation,which enter the radioactive pool with the coolant of the primary circuit after oxidation and shutdown.According to the inspection of the measurement data from previous major overhauls of Fuqing Nuclear Power Plant,it is found that these radiation source items generally cause the environmental dose rate level of radioactive water pools to be higher than 2 mSv/h,and the exposure dose rate of drainage pipelines and equipment hot spots to be greater than 300 mSv/h.The first circuit source item,the dose rate level of the radioactive pool and related pipelines,the related problems in the drainage processγare analyzed,and the changes of the dose rate of the radioactive pool and its drainage pipeline and the downstream pit after the use of external power unit are compared.The results show that the source term deposited during the drainage of the radioactive pool is the main cause of hot spots and dose contribution.By using an external power device,the drainage rate can be effectively improved,and the high-dose-rate material filtration and related pipeline source transfer functions can be increased,which greatly improves the dose rate level in the drainage process of the radioactive pool.This practice provides a new perspective for radiation level control and anomaly handling during radioactive pool drainage,and the scheme can be generalized to radiation level control in the drainage process of radioactive pools in all nuclear power plants.
作者
郑明贵
ZHENG Minggui(Fujian Fuqing Nuclear Power Co.,Ltd.,Fuqing 350318,China)
出处
《电工技术》
2023年第10期59-61,64,共4页
Electric Engineering
关键词
辐射水平控制
放射性水池
剂量优化
源项去除
radiation control
radioactive pool
dose optimization
source item removal
