在机组运行过程中,硼表硼浓度与化学分析硼浓度会出现一定偏差,根据秦山第二核电厂几台机组的实际运行数据整理出该硼浓度偏差的具体数据,并通过对比对应时间内的10B丰度变化情况,分析10B丰度变化对该偏差的影响,得出该偏差主要是受10B变化的影响且在机组寿期中达到最大的结论,并针对该现象对机组运行提出建议。同时采用ORIENT对考虑了10B丰度变化的理论硼浓度进行计算,并通过与化学分析硼浓度的对比得出该计算结果是可靠的,由此可以更加准确地预测、跟踪计算堆芯硼浓度的变化。

The boric acid concentration measured from boron meter and chemical analysis deviates from each other in the process of reactor unit operation. In this paper, we use the experimental data from QSⅡ nuclear power plant to analyze the influence of 10B abundance on the deviation. We find out that the deviation will reach a maximum value during the MOL, and some advice on the operation of the plant is proposed according to this phenomenon. What’s more, we calculate the boric acid concentration through ORIENT and verify its reliability by comparison with chemical analysis. As a consequence, we can predict and monitor the changes of boric acid concentration in the core of reactor more accurately.