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The Crack Factors in Eddy Current Quantitative Inspection of Heat Exchange Tube in Steam Generator
Author(s): SHAO Wen-bin, QI Pan, CUI Hong-yan, LIAO Shu-sheng, HAN Jie, Research Institute of Nuclear Power Operation, China Nuclear Power Operation Technology Co., LTD.
Pages: 57-
61
Year: 2016
Issue:
11
Journal: Nondestructive Testing
Keyword: Quantitative; Weight analysis; Least square; Ridge regression;
Abstract: This work aims at the improvement of quantitative Bobbin eddy current inspection for the heat exchange tubes of steam generator(SG)in nuclear power plant.The accuracy of quantitative Bobbin inspection of heat transfer tubes in SG is affected by various of factors,such as the consistence of the material properties of the tubes;the characteristics of the defects;the types of defects in between the calibration tubes and actual tubes one;the property of testing equipment,the environmental features and so on.Previous researches were mostly concerned about the factors like characteristics of defects(such as length of defect,volume of defect and angle between defect and tube axial),and they were thought as the main factors,which may influence the quantitative accurancy.In order to control these factors for an improved tube Bobbin inspection,primary and secondary of these influencing factors should be clear.The weight factor analysis as a useful method is mainly applied.With crack depth as the dependent variable,least squares and ridge regression methods are quantitatively analyzed for the relationship between the influence factors and the variable.On this basis,the weights of these factors are obtained.
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