Modeling of the tritium reaction at the surface of Li2O was performed using data obtained in in-situ and out-of-pile tritium release experiments. In this model the effects of H2O and H2 in the sweep gas were considered. On the surface, recombination of -OT and dissociatively adsorbed -OH was considered to produce HTO. In addition to this, HT was considered to be produced by the reaction of surface tritium with dissociated hydrogen on the surface. On the surfaces of tubes and the solid breeder itself, conversion reactions of HTO to HT by H2 were also considered. Tritium inventory on the solid breeder surface and the released chemical form were calculated. They agreed fairly well with those of TTTEx in-situ tritium release experiments. It was found that H2O as well as H2 in the sweep gas affects tritium release behavior.