The leak tightness of French latest pressurized water reactors relies on the pre-stressing of the inner containment concrete wall. To improve the leak tightness of this wall, a procedure has been developed by EDF, including the application of a composite liner onto the intrados over a surface that encompasses the leaking areas identified during the pressure test as well as the “tensile stress area” derived from finite element computations. The method used for finite element computations (named ‘conventional’ method) is based on a number of conservative assumptions. With a view to optimizing the extent of the areas to be repaired, a realistic method (i.e. a less conservative method) has been developed. The paper presents the realistic model, its application, the main results and elements of validation and concludes with an assessment of the gain in realism.

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