Uranium fuel is a type of nuclear fuel used in reactors to generate electricity. It is primarily made from uranium-235, a naturally occurring isotope that can sustain a nuclear chain reaction. When uranium atoms are split, they release a significant amount of energy, which is harnessed to produce steam and drive turbines. To prepare uranium for use in reactors, it undergoes a process called enrichment, where the concentration of uranium-235 is increased. The enriched uranium is then formed into pellets, which are packed into fuel rods. These rods are placed in the core of a nuclear reactor, such as those found in nuclear power plants.