Parameters: recycled uranium uranium obtained from recycling of spent fuel. Since the concentration of U-234 in depleted uranium is depending on the product assay obtained in the enrichment process, an input is also required for this figure. This tails assay can be selected according to economic feasibilty. Typical values range between 0.2% and 0.3%. wt% U-235 (used for natural uranium) Pure uranium with U-235 contents depleted to lower than natural level. Values for use in pressurized water reactors (PWR) range between 3.6% and 4.1 wt-% (weight-percent), and for use in boiling water reactors (BWR) between 3.0% and 3.2%.ĭepleted to. wt% U-235 (used for natural uranium) pure uranium with U-235 contents enriched to level higher than natural. Pure (used for natural uranium) pure uranium of natural isotope composition, without decay products. In equilibrium with progeny (used for natural uranium) uranium of natural isotope composition, in secular equilibrium with its decay products (U-238/U-234 and U-235 series) The U-238/U-234 and U-235 decay series are considered. Parameters: natural uranium uranium obtained from natural sources. For elements other than uranium, natural isotope abundance is assumed. The calculator assumes that all compounds are in solid form. However, the neutron rate is calculated for the complete nuclide mix contained in the material type selected.
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