In one scenario, enrichment of 200 t of natural uranium yields 26 t enriched to 4% ²³⁵U that is used to power a reactor for a year. How much ²³⁵U is lost in the depleted uranium discarded during the enrichment process? The spent nuclear fuel removed after a year in the reactor contains about 0.8% ²³⁵U. Close to 86% of the ²³⁵U consumed actually fissions; the other 14% captures a neutron without fissioning. Verify that approximately half of the ²³⁵U contained in the 200 t of natural uranium actually fissions during the year of running the reactor.