Influence of Pd-Ni substitution on the formation of magnetic phases in the tetragonal U(Ni1_xPdx)2Si2 system and the corresponding magnetic phase diagrams are presented. The single crystals of two different substitutions x = 0.15 and 0.10 were grown and detailed studies by neutron diffraction were performed in horizontal magnetic fields up to B = 6 T. Both compounds order antiferromagnetically (AF) and exhibit three different AF structures below the Néel temperature. All three structures are formed by ferromagnetic basal planes stacked along c-axis with different q = (0,0, qz) propagation. For x = 0.10, the co-existence of two magnetic phases in the ground-state was observed.
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