  In this paper, we have estimated the neutrino mass ordering and the CP
violation sensitivity of the proposed Protvino to Orca (P2O) experiment after 6
years of data-taking. Both unitary and non-unitary $3\times 3$ neutrino mass
mixing have been considered in the simulations. A forecast analysis deriving
possible future constraints on non-unitary parameters at P2O have been
performed.
