Qualification of Multi-Mode Ultrasonic Techniques for ISI of Reactor Vessels and Piping
B. Dikstra, C. McNeil, K. Darling, Mitsui Babcock, UK
ABSTRACT
Detection of planar defects of throughwall orientation is most reliable when specular reflection can be achieved. In many practical cases, this requires two-probe techniques. While the tandem technique - using a pair of transverse-wave angle probes - is well established, two-probe techniques using longitudinal-wave probes have not been documented extensively. The latter techniques have advantages for inspection of austenitic welds and also, in certain cases of restricted access, for inspection of ferritic components. The paper describes these techniques, and the steps taken to qualify them for practical applications. These include a programme of parametric studies on the effects on detectability of defect size, shape and orientation. These studies encompass both theoretical modelling and experimental validation. Examples given show how a Technical Justification can be constructed on this basis.
Publication Source: 3nd International Conference on NDE in Relation to Structural Integrity for Nuclear and Pressurized Components, November 14-16, 2001, Seville Spain. Publisher: Tecnatom s.a. - [Homepage]
