Judgment of Parameters Correlation-Comprehensive Method

摘要

Researching parameters correlation is important to analysis of reliability uncertainty for passive system.The only criterion for traditional method to determine the parameters correlation is the correlation coefficient threshold.This method is subjective and needs improvement.Taking loss of normal feedwater accident of AP1000 passive residual heat removal system (PRHRS)as example,a comprehensive method was proposed to resolve the subjectivity problem of traditional method.Comprehensive method took account of scatter diagram of parameters and thermal transmission rule and significance testing of correlation coeffident comprehensively when judging parameters correlation.By comparing the effect of parameters judged by traditional and comprehensive methods respectivdy,we found the distance of traditional method was larger than that of comprehensive method,showing some parameters impacting thermal transmission rule removed by traditional method and comprehensive method could judge more precise and scientific parameters.So comprehensive method should be used to judge linear relation between parameters and thermal transmission rule.