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GRETE: Evaluation of Non-Destructive Techniques for Monitoring Material Degradation, �GRETE� Final Report

Funded under: FP6-JRC


The main objective of GRETE project was to assess the capability and the reliability of innovative inspection techniques by means of a round-robin exercise. The tested non-destructive techniques are different from standard inspection methods. While the aim of standard techniques is to detect macroscopic defects, the methods applied in this project are sensitive to any microstructural change in the material leading to a degradation of the mechanical properties of the component, long before macroscopic cracks are initiated and eventually grow. For the GRETE project two ageing mechanisms were chosen to illustrate the potential use of NDT methods for the monitoring of material degradation. One is the neutron irradiation damage occurring in reactor pressure vessels made of ferritic steels and the other is the fatigue in austenitic stainless steel piping. The evaluation of the NDT has been performed in each laboratory participating to the testing by comparing precisely the non-destructive signal measured and the material characteristics. The results of the testing have been gathered and interpreted in terms of sensitivity to the detection of damages. The results have also been used to draw recommendations for the future use of these non-destructive techniques for monitoring on site components degradation.

Additional information

Authors: DELNONDEDIEU M, EDF, Paris (FR);HEGEMAN H, NRG, Petten (NL);KAUPPINEN P, VTT (FI);BROS J, Tecnatom, Madrid (ES);DOBMANN G, Fraunhofer IZFP, Saarbrücken (DE);ACOSTA B, European Commission, Joint Research Centre, Institute for Energy, Petten (NL);ROGERSON A, SERCO Assurance, Hook (UK);PEROSANZ F, CIEMAT, Madrid (ES);HAHN P A, Austrian Research Centers GmbH - ARC, Seiberdorf (AT);GILLEMOT F, AEKI, Budapest (HU);KOMBER T, University of Hannover, Hannover (DE);NIFFENENGER M, PSI, Villigen (CH);NOVAK J, NRI, Prague (CZ);OETTEL R, SPG, Dresden (DE);ZIMMER R, Framatome, Duisburg (DE)
Bibliographic Reference: EUR 22282 EN (2006), 194 pp. Free of charge
Availability: Available from European Commission, JRC Knowledge Management Unit, Ispra (IT) Tel: +39 033278 9893 Fax: +39 033278 5409 E-mail: or Bruxelles (BE) Tel: +32 2 295 76 24 Fax: +32 2 299 63 22
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