堆芯三维在线监测系统SOPHORA的实现与验证

Implementation and preliminary verification of 3D on-line core monitoring system:SOPHORA

SOPHORA是中广核集团自主研发的基于堆内固定式探测器(FID)的堆芯三维在线监测系统。根据测量的FID读数和堆芯状态参数,结合堆芯核设计软件COCO和热工子通道分析软件LINDEN,SOPHORA重构出"最佳估算"的三维功率分布,并给出功率峰值裕量和热工DNB裕量等重要运行参数。以某三环路电站的可移动式探测器(MID)实际测量数据为基础,模拟FID测量数据作为SOPHORA的输入。从SOPHORA的功率峰值(F_q,F_(dh),F_z,DNBR)的输出结果与中广核集团自主研发的MAPLE通量图处理软件的实测功率峰值进行对比,F_q,F_(dh),F_z的平均偏差分别为0.7%,0.13%,0.4%,DNBR的最大偏差仅1.4%,该结果表明,SOPHORA的堆芯三维功率重构的结果是合理可信的。

A new on-line core monitoring software system （CMSS）, named SOPHORA, is developed by China General Nu- clear Power Corporation （CGN）. Based on the measured fixing incore detector （FID） readings and on-line core status parameters, the best estimated 3D core power distribution is reconstructed, and the safety relative parameters such as peaking local power margin and minimum DNB margin can be also provided. Pseudo simulated FID signals, which are generated from the core mova- ble incore detector （MID） measurement data, are used as input for SOPHORA to verify and to validate the system accuracy. Comparison results of core power peaking factors between SOPHORA and flux map processing code MAPLE show that the SO- PHORA three dimensional core power distribution reconstruction function is reasonable and acceptable.