  We investigate the ability of an antineutrino detector to determine the fuel
type of a reactor. A hypothetical 5t antineutrino detector is placed 25m from
the core and measures the spectral shape and rate of antineutrinos emitted by
fission fragments in the core for a number of 90 day periods. Our results
indicate that four major fuel types can be differentiated from the variation of
fission fractions over the irradiation time with a true positive probability of
detection at 95%. In addition, we demonstrate that antineutrinos can identify
the burn-up at which weapons-grade mixed-oxide (MOX) fuel would be reduced to
reactor-grade MOX on average, providing assurance that plutonium disposition
goals are met. In addition, we investigate removal scenarios where plutonium is
purposefully diverted from a mixture of MOX and low-enriched uranium (LEU)
fuel. Finally, we discuss how our analysis is impacted by a spectral distortion
around 6MeV observed in the antineutrino spectrum measured from commercial
power reactors.
