提高核电厂反应堆冷却剂系统旁路温度测量精度的方法

Method to Improve Measurement Accuracy for Bypass Temperature of Reactor Coolant System in Nuclear Power Plants

为进一步提高核电厂反应堆冷却剂系统旁路温度测量的精度,采用非线性最小二乘法,利用Matlab平台的Lsqnonlin函数进行非线性曲线拟合,建立铂电阻温度计的电阻-温度的关系函数;计算分析了通过关系函数计算所得的温度值与标准温度计的测量值之间的偏差。结果表明,采用非线性最小二乘法建立的电阻-温度关系函数使整个测温范围内的温度测量精度提高一个数量级。

In order to improve the accuracy of the temperature measurement in bypass of the reactor coolant system in nuclear power plants, MATLAB optimization toolbox Lsqnonlin function by the nonlinear least square method is used to make a nonlinear curve fitting to build the relational function of resistance-temperature. Calculate and analysis the deviation between the temperature value through the relational function and the measurement value of the standard thermometer. Results show that the relational function of resistance-temperature established by the nonlinear least square method can improve the accuracy of the temperature measurement throughout the whole measurement range for one order of magnitude.