用模式识别方法诊断堆芯故障

Core Failure Diagnosis withPattern Recognition

错装料诊断是反应堆初装料后必须完成的项目．根据谐波综合法原理，可用高阶谐波的线性组合来表示堆芯的通量分布．本文以谐波综合法得出的谐波系数作为通量分布特征的模式，与预先设定的各种有代表性的（包括故障）工况相比较，再根据模式识别原理，识别出实际堆芯最可能归属的模式，从而诊断出故障的类型．此诊断方法具有结果含义明确、结论合理、抗随机误差、计算简便等优点，可方便、有效地诊断探头失效、错装料等故障工况．

t is very important to diagnose the misloading after the reactor initial loading.Thispaper proposes a diagnosis method which combines the harmonics synthesis method(HSM)and pattern recognition principle(PRP).According to HSM,the neutron flux distribution can be expressed by a linear combination of the higher order harmonics.This paper takes their harmonics coefficients as the pattern features.Using PRP,the pattern for the reactor is identified from many possible patterns which are defined from some typical core failures(including normal condition)in advance.So the core failure is diagnosed.It has the advantages,such as meaningful and reasonable diagnostic result,high random error tolerance,simple and fast of calculation process,etc.It can easily and efficiently diagnose the core failure such as the detector malfunction,misloading,etc.