核仪表系统倍增时间短报警仿真分析

核仪表系统信号处理环节包含计数率计算、功率水平计算、倍增时间计算、阈值比较等算法。其中倍增时间用于表征堆芯注量率的变化率,应对异常反应性引入事故,在反应堆启动过程中当倍增时间小于设定值,会触发倍增时间短报警,闭锁控制棒提出。倍增时间短报警对核电站运行有着重要意义,本文基于Matlab对倍增时间算法编程实现,并仿真倍增时间短报警过程,验证了算法的有效性,并探究了算法中关键参数的设置对倍增时间短报警的响应时间影响。

The signal processing of nuclear instrument system includes counting rate calculation,power level calculation,doubling time calculation,threshold comparison and other algorithms.The doubling time is used to represent the change rate of the core flux rate,and to deal with the accident of abnormal reactivity.When the doubling time is less than the set value during the reactor startup,the short doubling time alarm will be triggered,the control rod will be locked.Short doubling time alarm is of great significance to the operation of nuclear power plant.In this paper,the algorithm of short doubling time is programmed and realized based on MATLAB,and the process of short doubling time alarm is simulated.The effectiveness of the algorithm is verified,and the effect of key parameters in the algorithm on the response time of short doubling time alarm is explored.