In order to turn nuclear fission into electrical energy, nuclear power plant operators have to control the energy given off by the enriched uranium and allow it to heat water into steam. Enriched uranium typically is formed into inch-long (2.5-centimeter-long) pellets, each with approximately the same diameter as a dime. Next, the pellets are arranged into long rods, and the rods are collected together into bundles. The bundles are submerged in water inside a pressure vessel.
This is a photo of nuclear fuel bundle being lifted from the reactor core. The characteristic blue glow of nuclear reactors is due to Cherenkov radiation or charged particles exceeding the speed of light in a medium.