In 1998, EPRI pursued the development of an ultrasonic examination program to develop examination techniques for steam generator tube examinations. EPRI worked with R/D Tech to develop multiple element search units and electronics specific to these steam generator tube applications. The work has resulted in the development of a technique to detect length size and depth size outside diameter stress corrosion cracking (ODSCC) at the roll transition. This technique was the first ultrasonic technique qualified to the US industry-mandated requirements for NDE of steam generator tubes. Correlation of ultrasonic to metallurgical results was very good for both detection and sizing. In the fall of 1999, the technique was applied in the field at Comanche Peak with success.

EPRI is continuing its efforts to develop additional techniques for other flaw mechanisms such as the detection and sizing of pitting and axial-orientated ODSCC as well as the additional development of technology for this application.

An overview of the techniques as well as a comparison of the ultrasonic and metallurgical results will be presented.