  The complete one-loop electroweak radiative corrections to the neutral
current Drell-Yan process $pp \to \ell^+\ell^- X$ are presented for the case of
longitudinal polarization of initial particles. The calculations are based on
the SANC computer system. The paper contains a brief description of the SANC
approach and a discussion of the sources of theoretical uncertainties in
electroweak effects.
