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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。
As the operating cycle of nuclear power plants grows, the characteristics of the narrow-range temperature probe of the primary loop of the reactor will drift to some extent. The changes of the thermal and hydraulic characteristics of the primary loop will also lead to the changes of the primary average temperature adder and the temperature deviation adder parameters Unreasonable, according to a cross-circuit temperature probe cross-comparison data on a loop narrow-range temperature probe and its adder to be amended. In view of the possible crossover over-tolerance phenomena, a correction method is proposed: a three-point curve fitting correction method of the first-round narrow-range temperature probe and a mean temperature adder of the first loop, and a two-point fitting correction method of the temperature deviation adder according to the deviation. The optimization and improvement measures and schemes are put forward from three aspects: excluding inherent temperature deviation factor, multi-condition weight coefficient method and horizontal and vertical trend ratios. The application of these measures and program measures as well as the project engineering site proves their feasibility and effectiveness.