  An application of muon scattering tomography is investigated for the
non-destructive verification of spent nuclear fuel dry storage casks in context
of international treaty declarations in proving that the diversion of plutonium
has not occurred during long term storage in the spent fuel storage facility.
It was shown in the previous studies that the method of muon scattering
tomography can provide a detailed 3-D image of the spent fuel container but
with the measurement time required for that is in the range of a day or even
longer. In this paper we investigate the feasibility of a fast verification of
dry storage casks in order to obtain an immediate answer without a detailed 3-D
image reconstruction of container content if at least one fuel assembly is
missing. We have performed preliminary modelling using Geant4 of safeguards
verification of spent fuel dry storage cask HI-STORM 190 with cosmic ray muons.
The simulated data were analysed using the Point of Closest Approach method and
Kolmogorov statistical test. To infer the state of content of dry casks we have
performed the comparison and further classification of muon observable for the
scenarios of one missing fuel assembly with respect to fully loaded casks. The
results of this study indicate that one missing fuel assembly can be detected
with measurement times of about one hour.
