The application for examination technology of rod cluster control assembly in nuclear power plant

During nuclear power plant operation, three typical defects may be generated in the Rod Cluster Control Assembly (RCCA). Through operation situation of RCCA, this paper describes and analyzes three kinds of the reasons leading to the typical defects generated in RCCA. The theory of the special examination technique including ultrasonic and eddy current examination methods are introduced in this paper. According to examination practice of RCCA in nuclear power plant, the analysis methods for main defects and the examination results are concluded. This RCCA examination technology will be provided for the reference experience of the future RCCA examination. (authors)