基于钒探测器补偿的轴向偏移控制设计

Design of Axial Offset Control with Compensated Vanadium Detector

机械补偿控制是基于控制棒调节反应堆功率并进行轴向功率偏移控制的先进技术,频繁移动的控制棒对传统堆外校准后的轴向功率偏差测量精度有较大的负面影响,采用能给出准确堆内功率分布的钒基自给能探测器的信号可对其进行校正。为补偿钒探测器较长的响应时间,设计了超前/滞后控制器,提出了用补偿后的信号对堆外测量得到的轴向功率偏差信号进行修正的方法。仿真结果表明,该方法能有效应对控制棒移动对轴向偏移控制的影响,可提高控制精度。对该方法的安全相关影响、可实施性及性能分析表明,其具有较高的实用价值。

The mechanical shim is an advanced technology for reactor power control and axial offset control upon the regulation of control rod assemblies.The variable positions of control rod assembly adversely impact the accuracy of the traditional axial offset control based on the calibration with ex-core power range neutron fluence rate measurements.The signals from in-core self-powered vanadium detectors which provide very precise measurement of neutron fluence rate distribution normally can be utilized for the tuning.To compensate the unacceptable long response time delays,a lead-lag controller was designed and the method of the axial offset control upon the compensated signals was proposed.The simulation results indicate that the method can improve the accuracy of the axial offset control by overcoming the negative impacts resulting from the movement of the control rod assembly.The further analysis,in terms of safety,applicability and performance issues,indicates the design is of great value.