Eddy current modelling for the nuclear industry : an overview of the CIVA simulation software features
G. Pichenot, D. Prémel (1), G. Cattiaux (2),
(1) CEA/LIST, (2) IRSN,
5th International Conference on NDE in relation to Structural Integrity for Nuclear and Pressurized Components, San Diego, Californie, USA, 10-12 mai 2006,
Rapport DSR 130
Eddy current testing (ET) is widely used for the in-service inspection of tubes in the nuclear industry and for other components such as control rod drive mechanism (CRDM), fuel assembly, vessel bolts and Inconel areas which could be sensitive to stress corrosion. The development of new inspection methods and the quantitative evaluation of existing ones benefit greatly of recent progress made in ET modeling.
The CEA has developed a multi-technique simulation software named CIVA for non destructive testing. Its ET simulation module has been extended to the simulation of tubing inspection and other nuclear applications in cooperation with the French Institute for Radiological Protection and Nuclear Safety (IRSN).
The new functionalities of the ET module are presented in this paper. For the tubing inspection purposes, they include the bobbin coil configuration with various parametric flaws (groove, transversal and longitudinal notch, flat bottom hole) and the adequate analysis functions to calibrate, plot and measure simulated and experimental signals. The ET simulation module has also been extended to the encircling coil configurations. The case of a surface riding or pancake probe located either inside or outside a tube has also been appended to the ET part of the CIVA software.
All combinations of coils arrangement and frequencies might be simulated at once, thus enabling one to set up or to evaluate an inspection procedure including array probes and frequencies mixing.