某核电厂控制棒测量棒位跳变问题分析与处理

控制棒提供堆芯反应性控制与停堆裕量，其真实物理棒位由棒位测量系统监测。某核电厂棒控与棒位测量系统设备换型后，在系统调试阶段出现了真实棒位不变测量棒位频繁跳变的问题。本文通过棒位测量原理及后处理电路特性研究，结合已有数据分析，确定了棒位频繁跳变根本原因是探测器初级线圈供电不同频同相，并给出了棒位探测器参数设定方法。通过现场采集数据，开发棒位探测器校准数据处理软件解决了该核电厂棒位跳变问题，同时针对测量棒位跳变问题的根本原因提出了硬件层面的优化建议。 

Analysis and Treatment on Control Rod Measured Position Fluctuation of A Nuclear Power Plant

Core reactivity control and shutdown margin are provided by control rods. The actual physical position of control rod is monitored by rod position measurement system. After equipment type change of rod control and rod position measurement system in a nuclear power plant, an issue that fluctuation of measured position exists even with a stable physical position occurred during the system commissioning. Based on the study of rod position measurement principle and post-processing circuit characteristics, combined with the analysis of existing data, this paper determines that the root cause of the rod position fluctuation is that the power supply of the detector's primary coil is different in frequency and in phase, and the parameter setting method of rod position detector is also given. By data acquisition on site and development of calibration data processing software for rod position detectors, the rod position fluctuation problem of the power plant was solved. At the same time, the hardware-level optimization suggestions are put forward for the root cause of measured position fluctuation.