The document specifies requirements relating to criticality safety during the processing and handling of fissile material, in particular criticality data for uranium dioxid light-water mixtures. It gives numerical values and curves shall be used on isolated system of uranium dioxid (UO2) homogeniously distributed in light water with uranium enrichments of 5 %, 20 % and 100 % massfractions U 235 with maximum reflection by light water.