Frequency of SNF Misload for Uncanistered Fuel Waste Package

The purpose of this engineering calculation is to estimate the frequency of misloading spent nuclear fuel (SNF) assemblies that would result in exceeding the criticality design basis of a waste package (WP). This type of misload - a reactivity misload - results from the incorrect placement of one or more fuel assemblies into a waste package such that the criticality controls do not match the required controls for the fuel assemblies. An actual criticality event can not occur in a WP unless a moderator (e.g. water) is present. While a thermal misload is possible (load fuel that exceeds the thermal limits of a WP), it is not addressed in this analysis.