CPR1000机组一回路窄量程温度探头修正及优化

Modification and Optimization of Narrow Range Temperature Probe in CPR1000 Unit

随着核电厂运行周期的增长,反应堆一回路窄量程温度探头特性会发生一定的漂移,一回路热工水力特性等因素的改变也将导致一回路平均温度加法器以及温度偏差加法器参数设置的不合理,需根据一回路温度探头交叉比较数据对一回路窄量程温度探头及其加法器进行修正。针对可能出现的交叉比较超差现象,提出了修正方法:一回路窄量程温度探头三点曲线拟合修正法和一回路平均温度加法器以及温度偏差加法器根据偏差量两点拟合修正法。从排除固有温度偏差因素,多工况权重系数法和横、纵向趋势比对3个方面提出优化和改进措施及方案。这些措施及方案措施及方案工程现场的应用证明了其可行性和有效性。

With the extension of the operation period, the characteristics of narrow range temperature probe will be drifting and aging in CPR1000 units. At the same time, the change of thermal hydraulic characteristics factors will also lead to the unreasonable setting of the parameters of average temperature summary and temperatuxe deviation summary. Therefore, it requires to modify the characteristics of narrow range temperature probe and the parameters of summary according to the cross comparison data. Aiming at the possible deviation, the modification method is put forward： the fitting modification method for three point curve of narrow range temperature probe and the fitting modification of two point curve of the average temperature summary and temperature deviation summary. And the optimization and improvement scheme is put forward, including excluding natural temperature deviation factor, weight coefficient in different operation conditions and horizontal / vertical trend comparison. These methods had been applied in the field, and were nroved to be feasible and effective.