Otis Singleton
Nuclear power plants have supplied about 20% of the U.S.'s annual electricity generation since 1990, and nuclear reactors generate close to one-third of the world's carbon-free electricity. Uranium is the most widely used fuel for nuclear fission, which is used in nuclear power plants to generate electricity. During nuclear fission, a neutron collides with a uranium atom, causing it to split and release a large amount of energy in the form of heat and radiation. This energy can be converted into electricity.
| Characteristics | Values |
|---|---|
| Does breaking a uranium atom create electricity? | No, breaking a uranium atom does not directly create electricity. However, it does release a large amount of energy in the form of heat and radiation, which can be converted into electricity in a nuclear power plant. |
| Uranium type used in nuclear power plants | U-235, a specific type of uranium with atoms that are easily split apart |
| Nuclear power plants' share of U.S. electricity generation | About 20% of annual U.S. electricity generation since 1990 |
| Environmental impact of nuclear power plants | Nuclear power plants are a low-carbon source of energy that do not produce air pollution or carbon dioxide during their operation. However, the processes for mining, refining uranium ore, and constructing the plants require large amounts of energy and can generate radioactive waste. |
| Nuclear fission process | During nuclear fission, a neutron collides with a uranium atom, causing it to split and release energy, neutrons, and radiation. These neutrons then collide with other uranium atoms, creating a chain reaction. |
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![Fission of uranium with 5.7-Bev protons / by Rex H. Shudde. 1956 [Leather Bound]](https://m.media-amazon.com/images/I/61IX47b4r9L._AC_UY218_.jpg)
What You'll Learn
Nuclear fission
The atoms most commonly used in nuclear fission are those of uranium or plutonium. Uranium is a naturally occurring metal found in rocks worldwide, and it is the most widely used fuel for nuclear fission in power plants. However, a specific type of uranium, U-235, is used as fuel because its atoms are easily split apart. U-235 has 92 protons and 143 neutrons in its nucleus, and this arrangement is somewhat unstable. When a U-235 nucleus absorbs an extra neutron, it quickly breaks into two parts, releasing two or three more neutrons. These neutrons can then hit other U-235 atoms, causing them to split and release more neutrons in a multiplying effect, creating a chain reaction.
This chain reaction can be controlled in nuclear power plant reactors to produce the desired amount of heat. The heat warms the reactor's cooling agent, typically water, to produce steam. The steam is then channelled to spin turbines, activating an electric generator to create electricity. Nuclear power plants produce about one-third of the world's carbon-free electricity and are crucial in meeting climate change goals.
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Uranium enrichment
The enrichment process typically involves the use of uranium hexafluoride, which can be enriched to produce fuel for most types of reactors. There are two commercial enrichment processes: gaseous diffusion and gas centrifugation. Both processes produce enriched uranium oxide, which is suitable for nuclear fuel production.
Reprocessed uranium (RepU) undergoes a series of chemical and physical treatments to extract usable uranium from spent nuclear fuel. RepU recovered from light-water reactors (LWRs) typically contains slightly more 235U than natural uranium and can be used to fuel reactors that customarily use natural uranium, such as CANDU reactors.
North Korea's uranium enrichment facilities, such as the Kangsong and Yongbyon plants, have been the subject of recent attention, with the country releasing images and making statements indicating the production of weapons-grade uranium.
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Nuclear chain reaction
Breaking a uranium atom does not directly create electricity. However, breaking uranium atoms, also known as nuclear fission, is a crucial step in the process of generating electricity in nuclear power plants. Uranium is the most widely used fuel by nuclear plants for nuclear fission.
Nuclear fission involves splitting uranium atoms, which releases a large amount of energy in the form of heat and radiation. This energy can be harnessed to produce electricity. During nuclear fission, a neutron collides with a uranium atom, causing it to split and release more neutrons. These neutrons then collide with other uranium atoms, initiating a chain reaction.
This process, known as a nuclear chain reaction, is a self-propagating series of nuclear reactions. In the context of nuclear power plants, the reaction is carefully controlled to produce the desired amount of heat. The heat generated through nuclear fission warms the reactor's cooling agent, typically water, producing steam. This steam is channelled to spin turbines, activating an electric generator to create electricity.
The concept of a nuclear chain reaction was first hypothesized by Hungarian scientist Leó Szilárd in 1933. However, it was not until 1938 that nuclear fission was discovered by Otto Hahn and Fritz Strassmann. In 1939, Frédéric Joliot-Curie, H. Von Halban, and L. Kowarski discovered neutron multiplication in uranium, providing proof of the possibility of a nuclear chain reaction.
Nuclear power plants have played a significant role in electricity generation, contributing about 20% of annual U.S. electricity production since 1990. Nuclear reactors generate approximately one-third of the world's carbon-free electricity and are crucial in meeting climate change goals.
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Nuclear power plants
The world's first nuclear power station to generate electricity for a power grid was the Obninsk Nuclear Power Plant in the Soviet Union, which commenced operations on June 27, 1954. The first full-scale power station, Calder Hall in the United Kingdom, opened on October 17, 1956, and was intended to produce plutonium.
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Nuclear fuel cycle
The nuclear fuel cycle is a series of industrial processes that involve the production of electricity from uranium in nuclear power reactors. Uranium is a relatively common element found throughout the world, and the nuclear fuel cycle starts with its mining and ends with the disposal of nuclear waste.
The nuclear fuel cycle can be divided into two phases: the front end and the back end. The front-end steps prepare uranium for use in nuclear reactors. Uranium is mined and then milled, converted, enriched, and fabricated into fuel pellets and rods. The back-end steps ensure that the used, highly radioactive nuclear fuel is safely managed, prepared, and disposed of. Used fuel may undergo temporary storage, reprocessing, and recycling before the waste produced is disposed of.
Uranium is a slightly radioactive metal that occurs throughout the Earth's crust. It is found in most rocks and soils, as well as in many rivers and seawater. Uranium ore deposits are located using techniques such as airborne radiometric surveys, chemical sampling of groundwater and soils, and exploratory drilling. Once located, mine developers determine the amount of uranium available and the cost of recovering it. Uranium is then mined using techniques such as open-pit, underground, or solution mining.
The uranium ore is milled to produce uranium concentrate (yellowcake), which can be used as fuel. The yellowcake is converted into uranium hexafluoride (UF6) gas at a converter facility. The UF6 gas is then sent to an enrichment plant, where the individual uranium isotopes are separated to produce enriched UF6 with a higher concentration of U-235. This enriched UF6 is then transported to a nuclear reactor fuel assembly plant, where it is converted into nuclear fuel. At a nuclear fuel fabrication facility, the solid UF6 is heated to form a gas, which is then chemically processed to form uranium dioxide (UO2) powder. This powder is compressed into small ceramic fuel pellets, which are then stacked and sealed into metal tubes to form fuel rods. These fuel rods are then arranged into a fuel assembly, ready for use in a nuclear reactor.
The used fuel rods are replaced periodically, and the old and fresh assemblies are rearranged to maximize the reactivity of the reactor core and minimize fuel-cycle costs. This is known as the optimal fuel reloading problem, and it is an ongoing issue in reactor operations without a definitive solution.
The safe disposal and isolation of spent fuel from reactors or waste from reprocessing plants is a current concern in the nuclear power field. These materials must be isolated until their radioactivity has diminished to a safe level. In the United States, the Department of Energy is responsible for developing a waste disposal system, with plans to ultimately dispose of the wastes in a deep geological repository.
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Frequently asked questions
Uranium atoms are split apart in a process called nuclear fission, which releases a large amount of energy in the form of heat and radiation. This heat is then converted into electricity in a nuclear power plant.
Nuclear fission is a process where atoms are split apart to form smaller atoms, releasing energy. Nuclear fission can be initiated by a neutron colliding with a uranium atom, which releases more neutrons that continue to collide with other uranium atoms, creating a nuclear chain reaction.
Uranium is a low-carbon source of energy that does not produce air pollution or carbon dioxide during the operation of nuclear power plants. Uranium is also a common metal found in rocks worldwide, making it an accessible fuel source for nuclear fission.
