Ultrasonic Testing Technique for Closure Stud of Reactor Pressure Vessel

As an important component of nuclear devices, reactor pressure vessel closure studs need to be examined during pre-and in-service inspection according to RSEM. The inspection equipment is a complicated system including mechanical devices, controlling devices and UT inspection devices. This paper focuses on introducing the scope of the reactor pressure vessel closure studs by UT, selection of probes, scanning pattern, and the calibration & verification, used equipments, acquisition and analysis system.