Non Destructive Evaluation of the durability and damages of concrete in nuclear power plants.

Garnier, Vincent; laboratory of mechanic and acoustic, CNRS, Aix Marseille University; France

Garnier, V.; Aix Marseille Université; France
Piwakowski, B.; Ecole Centrale de Lille; France
Henault, J.M.; EDF-R&D-STEP; France
Verdier, J.; Université de Toulouse; France
Balayssac, J.P.; Université de Toulouse; France
Ranaivamonana, N.; Université de Toulouse; France
Chaix, J.-F.; Aix Marseille Université; France
Rakotonarivo, S.; Aix Marseille Université; France
Villian, G.; IFSTTAR; France
Abraham, O.; IFSTTAR; France
Derobert, X.; IFSTTAR; France
Payan, C.; Aix Marseille Université; France
Sbartaï, Z.M.; Université de Bordeaux; France
Saliba, J.; Université de Bordeaux; France
Larose, E.; ISTERRE; France
Hafid, H.; MISTRAS Group SA; France
Drelich, R.; Institute of Mechanics and Applied Computer Science, Kazimierz Wielki University; Poland
Ciccarone, C.; IEMN CNRS École Centrale de Lille; France

ID: ECNDT-0349-2018
Download: PDF
Session: Civil Infrastructure-Conrete 3
Room: J1
Date: 2018-06-13
Time: 14:30 - 14:50

The “Non Destructive Evaluation of containment nuclear plant structures” project (ENDE) is a French project developed with 8 partners. Their aims are to control the containment structures by Non Destructive Testing with ultrasonic, electromagnetic and electric techniques the results of which are combined to help consolidate the evaluations. Different solutions are proposed, first to estimate the properties of the concrete and second to follow the damages and the cracks.
The 4 years project was built in two steps.
The first consists in realizing two sets of tests on specimens in the laboratory. The objectives of the first set are to quantify the sensitivity of the NDT to durability indicators (elasticity modulus, porosity, water content) of the material and the stress applied on it. The second set was developed to evaluate the damaged zone and length and opening of the cracks. Data fusion is applied and developed for each result with two specific processes. It allows to select the most sensitive and efficient Non Destructive parameters.
The second step consists in applying the selected parameters on real structures that are containment structures under pressure. We present results obtained on a mock-up of a containment wall on a 1/3 scale made by EDF (Electricity of France) within the VeRCoRs program. These tests are linked to the ten-year nuclear power plants control in which the two functions regularly tested are the concrete mechanical properties and the containment walls leakage. In case of an accident (LLCA) the conditions inside the containment could be severe (p=4.2 b – T=180°C).
The communication presents the ENDE project which integrates the latest research associated to the NDT for an early evaluation of the concrete evolutions and, the transfers from the laboratory to on-site measurements. It presents the main results that could be exploited on all civil engineering structures.