  The spin program at NICA using SPD and MPD requires high intensity polarized
proton beam with high value of the beam polarization. First results on the
measurements of the proton beam polarization performed at internal target at
Nuclotron are reported. The polarization of the proton beam provided by new
source of polarized ions has been measured at 500 MeV using quasielastic
proton-proton scattering and DSS setup at internal target. The obtained value
of the vertical polarization of ~35 % is consistent with the calculations
taking into account the current magnetic optics of the Nuclotron injection
line.
