  Perturbative calculations of the static QCD potential have the $u=3/2$
renormalon uncertainty. In the multipole expansion performed within pNRQCD,
this uncertainty at LO is known to get canceled against the ultrasoft
correction at NLO. To investigate the net contribution remaining after this
renormalon cancellation, we propose a formulation to separate the ultrasoft
correction into renormalon uncertainties and a renormalon independent part. We
focus on very short distances $\Lambda_{\rm QCD} r \lesssim 0.1$ and
investigate the ultrasoft correction based on its perturbative evaluation in
the large-$\beta_0$ approximation. We also propose a method to examine the
local gluon condensate, which appears as the first nonperturbative effect to
the static QCD potential, without suffering from the $u=2$ renormalon.
