Using density function theory (B3LYP) method, a variety of equilibrium structures for the OUH system have been optimized. Its most stable structure, the dissociation energy and harmonic force constants have been obtained. The Murrell-Sorbie potential energy functions and spectrum data of diatom molecules UH and UO in OUH have been derived. The analytical potential energy function for the ground state OUH(X^4A') was derived usign the many-body expansion method. The potential energy surfaces reflect accurately equilibrium geometry of OUH. The results imply that the U+OH, O+UH and H+UO are exothermic reactions without threshold.

Key words: ANALYTIC FUNCTION, URANIUM OXIDE, OXIDATION, URANIUM, STEAM, MOLECULAR STRUCTURE, POTENTIAL ENERGY SURFACES