核仪表系统停堆中子注量率高报警定值自动更新逻辑研究  

Study on High Flux at Shutdown Alarm Set-Point Updating Logic

作　　者：杨文清 李晓飞 柳文乾 柳继坤 Yang Wenqing;Li Xiaofei;Liu Wenqian;Liu Jikun(State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment,China Nuclear Power Engineering Co.,Ltd.,Guangdong,Shenzhen,518172,China)

机构地区：[1]中广核工程有限公司核电安全监控技术与装备国家重点实验室,广东深圳518172

出　　处：《仪器仪表用户》2021年第11期60-63,共4页Instrumentation

摘　　要：核仪表系统源量程用于停堆到启动初始阶段堆芯中子注量率监视,当源量程探测器测量的计数率高于设定值时,触发源量程停堆中子注量率高报警,该报警提醒操作员堆芯可能存在正反应性引入,如误稀释与意外提棒。分析了某核电厂停堆中子注量率高报警设定值的自动刷新逻辑,发现源量程自动投运后,报警设定值会自动更新至低值,从而导致报警误触发。从运行行政管理与报警逻辑优化的角度探讨了报警误触发的规避措施,结果表明两种措施都是可行的。Reactor neutron flux is detected by source range(SR)of nuclear instrumentation system from shutdown to initial startup.When the count rate measured by SR detector is higher than the set-point,a high flux at shutdown alarm will be triggered.This alarm indicates the existence of positive reactivity added to the core,e.g.dilution or control rods withdraw.Analyses the SR high flux at shutdown alarm set-point updating logic of a NPP.And find that after the re-using of SR,the set-point will be updated to a low value,which causes the alarm to be triggered by mistake.Discusses the circumvention measures of alarm false triggering from the perspective of operational administration and logic optimization,and the results show that both measures are feasible.

关 键 词：核仪表系统 停堆中子注量率高报警 运行行政管理 

分 类 号：TL36[核科学技术—核技术及应用]