There are different kinds, or isotopes, of uranium, and the type used in nuclear power plants is called uranium-235, because these atoms are easiest to split in two.
It is made up of old fuel rods that have become sufficiently depleted of uranium-235, the isotope that drives a reactor’s main chain reaction, to be no longer useful.
乏燃料由完全耗尽铀-235的旧燃料棒组成，核反应堆的链式反应就是由铀-235激发的。
3
When you split a uranium235 atom you will create what we call fission fragments.