  Drell-Yan W/Z electroweak boson production at the LHC is an essential
standard candle which is used for calibration of beam luminosity and detector
properties. In addition to proton-proton collisions, the LHC has measured heavy
nuclei lead-lead and proton-lead W/Z production. Inclusion of these data sets
in future fits can provide discriminating information of the nuclear
modifications present in the Parton Distribution Functions (PDFs). We present
an ongoing analysis of W/Z production in lead-lead and proton-lead collisions
at the LHC using the \texttt{nCTEQ15} nuclear Parton Distribution Functions
(nPDFs) including uncertainties. The cross sections are calculated at NLO with
the \texttt{FEWZ\ 2.1} program at 2.76 and 5.02 TeV. We identify promising
observables for the observation of the nuclear modifications.
