Uptake of hydrogen by the cladding of fuel rods during LWR operation worsens the mechanical properties of the material and can lead to cladding failure. The U.S. NRC has introduced a dependency of the equivalent cladding reacted (ECR) criterion on the H-content in the cladding and has proposed a burnup dependent calculation model of the H-content based on a large database which does not cover high burnup such as those reached in Switzerland. This work addresses how the extrapolation of the proposed H-content calculation is conservative compared to the experimental values on claddings irradiated in Swiss plants. Therefore, a model is proposed to calculate the H-content in Swiss BWR fuels up to high burnup, based on published experimental data. The new correlation leads to less conservative results. This is demonstrated with the simulation of a postulated LOCA in a Swiss BWR, where the high exposure bin in the core is no longer expected to fail.