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Uranium

Natural Uranium VS

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Spent Nuclear FuelSpent nuclear fuel is literally just fuel that has been burnt or irradiated at a plant. According to Wikipedia, "a fresh rod of low enriched Uranium pellets will become a highly lethal gamma emitter after 1-2 years of core irradiation, unsafe to approach unless under many feet of water shielding." Properties of Spent Fuel During the operation of a nuclear core, temperature gradients cause fission products to move around the fuel rod. The zirconium moves toward the center where temperature is h Nuclear ReactorIn it's most simplest form, a nuclear reactor uses Uranium and other radioactive materials and the fission from uranium to create heat, and transfer that heat into steam to create power. Nuclear reactors are one of the biggest sources of energy, although not renewable, uranium has a very high energy density resulting in massive power transmissions. There are many different types of nuclear reactors, and this term serves as a broad hub/introduction for each type. After uranium is used in reacto BWR reactorA boiling water reactor uses Light Water as both coolant and neutron moderator. The second most used reactor, next to the PWR reactors, there are approximately 75 plants in current operation. The efficiency of these reactors is about 46%, with 33-34% in practice. Enriched uranium is used as nuclear fuel, as light water absorbs too many neutrons to use Uranium that is natural. Light water is not as good of a moderator compared to Heavy Water or graphite, but it is good as in the event of a LOCA o CANDU ReactorA CANDU reactor is a canadian PHWR design for the gneration of power. CANDU stands for CANada Deuterium Uranium; it uses Heavy Water containing deuterium oxide as its moderator and originally designed to use natural Uranium fuel.Fast Neutron ReactorA Fast Neutron Reactor is a specific type of reactor that different from a Thermal Reactor-- it is not very common because unlike a thermal reactor that uses neutron to sustain the chain reaction, a FNR has no neutron moderation and less primary coolant due to an excess of fast neutrons * the capture to fission ratio is lower is fast reactors * high number of neutron produced per one fission * Neutron Flux has differences too The following image shows the neutron flux differences 400 Neutron F PWR reactorThis reactor is a PWR reactor - a pressurized water reactor. This is a specific type of Nuclear Reactor--in that it is pressurized water. This is also the most common type of reactor used and produced. The fuel rods are pressurized with helium, and the fission gas products result in more stability; as fuel "burns" in the reactor, the density increases resulting in small voids developing. Helium pressurization is necessary as these voids can cause potential rupture of fuel rods. Furthermore, the

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