摘要
田湾核电VVER-1000机组换料启动达临界最后阶段采用稀释达临界方式。目前,为满足动态刻棒试验初始条件,临界后需实施“注硼赶棒”操作,提升第10组控制棒至80%~90%堆芯高度,占用大修关键路径。为此开展了换料启动达临界棒位优化工作,将临界时第10组控制棒棒位由当前的60%堆芯高度提升至80%堆芯高度以上。围绕棒位优化对机组的运行和核安全的影响,开展了临界安全影响、FSAR事故分析影响的定性评价、棒位优化前后堆芯参数定量计算比较,以及对核电厂文件的影响审查,确保棒位优化工作的实施不影响机组的安全运行。从实际实施效果看,棒位优化后可缩短大修主线时间,同时减少放射性废液排放量,显著提升机组运行经济性。
The final stage of criticality of VVER-1000 units of Tianwan nuclear power station adopts the boron dilution criticality method.At present,in order to meet the initial conditions of the dynamic control rod worth measurement test,it is necessary to implement the operation of boron injection to withdraw the 10th group of control rods to 80%~90%of the core height after reactor criticality,which occupies the critical test path of the refueling outage.For this reason,it was carried out to optimize the control rod position during startup to criticality after refueling to withdraw the 10th group of control rods at criticality from the current 60%core height to more than 80%.With regard to the impact of control rod position optimization on nuclear safety and power plant operation,qualitative evaluations of criticality safety and FSAR accident analysis impact,quantitative calculation comparison of neutron-physical parameters before and after control rod position optimization,as well as a review of the impact on documents were carried out to ensure that the implementation of control rod position optimization does not affect the operational safety of the VVER-1000 unit.From the actual implementation results,the control rod position optimization can save the main line time for refueling outage and reduce the radioactive waste discharge,which significantly improves the operating economy of VVER-1000 units of Tianwan nuclear power station.
作者
张健夫
ZHANG Jianfu(Jiangsu Nuclear Power Corporation,Lianyungang,Jiangsu Prov.222000,China)
出处
《中国核电》
2025年第4期518-522,共5页
China Nuclear Power
