Tritium transport in Edge Localized Mode (ELMy) high confinement (H-mode) plasmas is analysed here as a function of density for discharges from the recent trace tritium experimental campaign performed on Joint European Torus. In this campaign small amounts of tritium have been puffed or injected (with neutral beam injectors) into deuterium plasmas [8]. Information about the tritium has been obtained from the evolution of the profiles of neutron emission simulated via the TRANSP [16] and SANCO [17] codes. A strong inverse correlation of tritium transport with plasma density is found in this analysis. The low tritium transport at high density is close to neoclassical values while the transport becomes strongly anomalous in low density plasmas. The thermal transport does not exhibit such a strong density dependence, leading to a varying ratio of thermal to tritium transport in these pulses. An interpretation of the density effects on the trace tritium transport, partially based on the test particle simulations in plasmas with stochastic magnetic field, is proposed. A simple model for the tritium diffusion coefficient and convective velocity, which includes the modification of the neoclassical particle diffusion in presence of electromagnetic turbulence [14] completed with an empirical density dependence, is developed. This model has positive b-dependence in agreement with the results of the similarity experiments performed for trace tritium transport.