During the course of a hypothetical severe Pressurized Water Reactor accident, pressurization of the containment occurs and hydrogen can be produced by the reactor core oxidation and distributed in the containment according to convection flows and wall condensation . The TOSQAN project has been created to simulate these accidental thermal-hydraulic flow conditions and to study phenomena such as wall condensation in the presence of non-condensable gases. This phenomenon is a subject of many interests and extensive studies have been performed in the past [2,3,4,5]. Some empirical correlations have demonstrated their limit for extrapolation under different thermal-hydraulic conditions and at different geometries/scales . However, the previous studies have generally been performed for condensation on horizontal/vertical plates, at smaller scale, for controlled flows or at saturation. Other tests have been performed at very large scale with less instrumentation density than the one proposed in TOSQAN. The objective of this paper is to present the experimental results on wall condensation under more representative conditions of the real case, using a high density of gas flow instrumentation in order to set the limit of the validity of the condensation modelling used. Evaluation of the influence of different parameters on condensation variables is performed and results are compared to the Uchida empirical correlation and to a Chilton-Colburn analogy modelling.