Editing Enriched uranium (section)

===Reprocessed uranium (RepU)===
{{Main|Reprocessed uranium}}

Reprocessed uranium (RepU) undergoes a series of chemical and physical treatments to extract usable uranium from spent nuclear fuel. RepU is a product of [[nuclear fuel cycle]]s involving [[nuclear reprocessing]] of [[spent fuel]]. RepU recovered from [[light water reactor]] (LWR) spent fuel typically contains slightly more <sup>235</sup>U than [[natural uranium]], and therefore could be used to fuel reactors that customarily use natural uranium as fuel, such as [[CANDU reactor]]s. It also contains the undesirable isotope [[uranium-236]], which undergoes [[neutron capture]], wasting neutrons (and requiring higher <sup>235</sup>U enrichment) and creating [[neptunium-237]], which would be one of the more mobile and troublesome radionuclides in [[deep geological repository]] disposal of nuclear waste. Reprocessed uranium often carries traces of other transuranic elements and fission products, necessitating careful monitoring and management during fuel fabrication and reactor operation.