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The RSG-GAS is using U3Si2-Al dispersion fuels with uranium density of 2.96 gU/cc. The silicide uranium fuels is not used anymore for the future. To anticipate the usage of other fuels in the RSG-GAS core, UMo-Al fuels were chosen. The UMo-Al fuel has many advantages some of them, it can be used at higher density in the reactor core. There are high uranium densities in UMo-Al dispersion fuels up to 16 gU/cm3 with numerous contents of Mo. In this analysis, the RSG-GAS core is used with high density of UMo-Al fuel. The neutronic parameter are such as reactivity balances, keff and power peaking factor and safety reactivity factor of UMo-Al fuel with higher density. The UMo-Al core criticality data are achieved by calculation using Batan-FUEL code. The UMo-Al fuel macroscopic cross-section data as the output of cell calculation WIMSD-B5 (ENDFVII.0) were used for the calculation. The core calculations were performed using 2 and 3 dimension diffusion code. The calculation results show that the good fuel for RSG-GAS is U7Mo-Al with maximum radial and axial power peaking factor of U7Mo-Al with high density at 20 cm control rod depth is 1.32 and 1.73 respectively and safety reactivity factor more than 1.5. The results show that all neutronic parameter are met the safety criteria. Hence U7Mo with higher density could be applied for RSG-GAS core and operated for 1500 MWD cycle length