The Ultrasonic Inspection of Closure Stud of EPR RPV by Simulation Technique

EPR(European Pressurized Reactor) PSI&ISI program requires the Closure Stud must be performed with automated ultrasonic techniques. This paper chooses the ultrasonic inspection by using simulation technique. The ultrasonic field of five ultrasonic techniques was simulated by using semi-analytical method and the results were analyzed. The interaction of the five ultrasonic fields and defects was calculated by employing the Kirchhoff approach and the most suitable ultrasonic technique was selected the based on the above-mentioned results. The reliability and applicability of thus selected ultrasonic technique was then proved by experiment.