  The precise measurement of neutrino oscillation parameters is one of the
highest priorities in neutrino oscillation physics. To achieve the desired
precision, it is necessary to reduce the systematic uncertainties related to
neutrino energy reconstruction. An error in energy reconstruction is propagated
to all the oscillation parameters, hence a careful estimation of neutrino
energy is required. To increase the statistics, neutrino oscillation
experiments use heavy nuclear targets like Argon(Z=18). The use of these
nuclear targets introduces nuclear effects that severely impact the neutrino
energy reconstruction which in turn poses influence in the determination of
neutrino oscillation parameters. In this work, we have tried to quantify
nuclear effects on the determination of CP phase at DUNE using final state
interactions.
