NONDESTRUCTIVE TESTING APPARATUS AND METHOD FOR PENETRATION NOZZLE OF CONTROL ROD DRIVE MECHANISM OF REACTOR VESSEL HEAD

摘要

A nondestructive testing device and a method for the control rod driving device of an upper reactor head are provided. The nondestructive testing device according to an embodiment of the present invention detects ultrasonic waves generated when a welding part between an upper reactor head and the penetration nozzle of a control rod driving device and the penetration nozzle of the control rod driving device are irradiated with laser beams for scanning, makes an image with the detected ultrasonic waves, and performs damage visualization based on ultrasonic wave propagation imaging without the position variation of an ultrasonic sensor for detecting the ultrasonic waves while multiple spots in a specific area are irradiated with the laser beams for scanning. Accordingly, the present invention can reduce inspection hours by remarkably reducing test hours, thereby directly obtaining an economical effect.