Statistical analysis of certificate data for HTGR microfuel

The characteristics of microfuel with a multilayered coating, which is part of the HTGR spherical fuel elements in the Astra critical stand, are analyzed and generalized on the basis of certificate data using mathematical statistics. The average values of the parameters of microfuel (size of the kernel, coatings and microfuel, material density, uranium dioxide mass, uranium enrichment, impurity content, and others) are found. Their uncertainties are estimated. It is shown that the characteristics of microfuel from different batches do not differ significantly. The results obtained are used to analyze experiments on modeling of the physical characteristics of HTGR, which are under development, on critical assemblies of the Astra stand.[PUBLICATION ABSTRACT]