核电厂反应堆冷却剂系统旁路温度高精度测量方法研究

Method Research to Measure Bypass Temperature More Accurately of Reactor Coolant System in Nuclear Power Plants

为了提高核电厂反应堆冷却剂系统旁路温度的测量精度,建立了铂电阻温度计的温度-电阻特性曲线拟合模型和电阻-温度特性曲线模型,采用递推最小二乘法对样本数据进行拟合以确定特性曲线的模型参数。该方法根据铂电阻温度计的测量电阻值即可高精度计算出相应的温度。仿真结果表明,与现有方法相比,温度测量精度有明显提高,在温度检测领域具有重要的理论和应用价值。

In order to improve the temperature measurement accuracy of bypass of the reactor coolant system in nu-clear power plants,the models of temperature-resistance characteristic curve and resistance-temperature character-istic curve were established for a platinum resistance thermometer,and the parameters of the characteristic curvemodel were determined by using the recursive least square（RLS）algorithm for fitting sample data. The method cancalculate the corresponding temperature more accurately according to the measured the resistance of platinum resis-tance thermometer. The simulation results showed that the temperature measurement precision was improved obvi-ously compared with existing methods. Hence the method has important theoretical and application value in thefield of temperature detection.