Analysis of the Phased Array Ultrasonic Inspection Data for MARKII Last Stage Blade Roots

In the 1000MW nuclear power station, the phased array ultrasonic technique has already been used in the last stage blade root of the low pressure rotor. The ultrasonic data analysis is the key for this inspection. It is very important to correctly analyze the defect signal from many signals. In this article, there are some analysis methods which come from the on-site inspection or from some special test.