Management of large amount of hydrogen inside the containment building, during a severe accident is a major safety challenge. Assessment of possibility of hydrogen combustion and its damage potential is an integral part of hydrogen management program. In this direction CFD based predictive tools are very effective but need proper validation before using it to the reactor calculations. In this work, fast hydrogen deflagration has been modelled. ENACCEF facility, France has been chosen for simulation considering its uniqueness. RUN-153 of ENACCEF (13% v/v hydrogen in air with 63% blockage at the obstructed section) experiment is simulated. For reaction rate calculation, Eddy Dissipation model has been used. The CFD simulations have been carried out in 2D axisymmetric domain and the results have been compared against the experimental data. The effect of ignition strength is studied and results for both the flame velocity and pressure are compared simultaneously to bring out the inter dependence. The effect of initial turbulence level is also studied. The importance and effect of near wall region reaction rate modelling have been presented by introducing damping factor. The issues with using default value of EDM model constants have been discussed and the required future work in this direction has been highlighted.