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Nuclide composition non-uniformity in used nuclear fuel for considerations in pyroprocessing safeguards

The probability of Type-I error for the plutonium Material Unaccounted For (MUF) is evaluated by the hypothesis testing method as a function of the sizes of powder particles and granules, which are dominant parameters to determine the sample size. The results show the probability of Type-I error is occasionally greater than 5%. However, increasing granule sample sizes could surmount the weakness of material accounting because of the non-uniformity of nuclide composition. | Nuclide composition non-uniformity in used nuclear fuel for considerations in pyroprocessing safeguards