压水堆核电站棒位测量偏差分析及应对

The analysis and solution to PWR rod position deviation

压水堆核电站棒位测量通常采用电磁感应原理,通过次级线圈感应初级线圈的交变磁场,得到感生交变电动势,并通过和设定的阈值电压比较生成5位标准格雷码。实际应用中,阈值电压取值范围较窄,需要花费较长时间调整阈值电压定值。运行过程中,也常出现棒位突变和报警的问题。基于棒位测量原理,给出了易用的阈值电压调整方法和棒位突变原因分析,也为该系统优化指明了方向。

The principle of electromagnetic induction is usually used in the rod position measurement of PWR nuclear power plant. The induced alternating electromotive force is obtained by inducing the alternating magnetic field of the primary coil through the secondary coil, and the five-digit standard Gray code is generated by comparing with the set threshold voltage. In practice, the threshold voltage has a narrow value range, so it takes a long time to adjust the threshold voltage. During operation, rod mutation and alarm problems often occur. Based on the principle of bar position measurement, an easy-to-use threshold voltage adjustment method and the analysis of the cause of bar position mutation are presented, which also points out the direction for the optimization of the system.