  We derive the neutrino flavor transition probabilities with the neutrino
treated as a wave packet. The decoherence and dispersion effects from the
wave-packet treatment show up as damping and phase-shifting of the plane-wave
neutrino oscillation patterns. If the energy uncertainty in the initial
neutrino wave packet is larger than around 0.01 of the neutrino energy, the
decoherence and dispersion effects would degrade the sensitivity of reactor
neutrino experiments to mass hierarchy measurement to lower than 3 $\sigma$
confidence level.
