Wiktor Wise
Nuclear power is a significant source of electricity, with 33 countries operating commercial nuclear power plants in 2021, and it is especially prominent in the US and France. Nuclear energy is produced by a process called nuclear fission, where atoms split and release energy in the form of heat and radiation. This heat is then used to produce steam, which turns turbines to generate electricity. The process is similar to how coal, oil, and gas power plants generate electricity, except nuclear power plants do not burn fuel and do not produce greenhouse gas emissions.
| Characteristics | Values |
|---|---|
| Nuclear energy source | Uranium |
| Uranium form | Ceramic pellets |
| Energy produced by one ceramic pellet | 150 gallons of oil |
| Nuclear reaction | Fission |
| Fission process | Splitting of uranium atoms |
| Fission output | Heat and radiation |
| Heat transfer medium | Water |
| Water function | Cools and moderates the reaction |
| Water state | Steam |
| Steam function | Turns turbines |
| Turbine function | Activates an electric generator |
| Electricity type | Low-carbon |
| Electricity output | 20% of America's electricity |
| No. of countries with commercial nuclear power plants | 33 |
| No. of countries where nuclear energy supplied at least 20% of their total annual electricity generation | 15 |
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What You'll Learn
Nuclear fission
Nuclear power plants use nuclear fission to generate electricity. Nuclear fission is a process where the nucleus of an atom splits into two or more smaller nuclei, releasing a large amount of energy in the form of heat and radiation. This energy can be used to produce electricity.
Nuclear power plants use uranium atoms for nuclear fission. Uranium is a common metal found in rocks worldwide, and it is processed into small ceramic pellets and stacked together into sealed metal tubes called fuel rods. These fuel rods are then immersed in water inside the reactor vessel, which acts as both a coolant and a moderator. The moderator helps slow down the neutrons produced by fission to sustain the chain reaction. Control rods can be inserted into or withdrawn from the reactor core to control the reaction rate.
The water in the core is heated by nuclear fission and then pumped into tubes inside a heat exchanger. These tubes heat a separate water source to create steam. The steam is then channelled to spin turbines, activating an electric generator to produce electricity. The core water is then cycled back to the reactor to be reheated, and the process is repeated.
Nuclear power plants are a low-carbon source of energy as they do not produce CO2 during their operation. Nuclear reactors generate about one-third of the world's carbon-free electricity and are crucial in meeting climate change goals. Nuclear power plants have supplied about 20% of annual US electricity generation since 1990.
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Uranium fuel rods
These fuel pellets are then stacked and sealed inside metallic tubes called fuel rods. The metal used for these tubes depends on the reactor design; historically, stainless steel was employed, but most reactors now use a zirconium alloy due to its high corrosion resistance and low neutron absorption. Each fuel rod is backfilled with helium to enhance heat conduction, and they are bundled together to form a fuel assembly. A reactor core typically consists of several hundred fuel assemblies, with each assembly containing hundreds of fuel rods.
The uranium fuel rods facilitate the nuclear fission process, where the uranium-235 isotope is hit by a neutron, causing it to split into smaller nuclei and release energy in the form of heat and radiation. This heat warms the reactor's cooling agent, usually water, producing steam that spins turbines to activate an electric generator, thereby generating electricity. Uranium fuel rods have a long burn time and emit strong radiation, making them a late-game fuel source for nuclear power plants.
Additionally, uranium fuel rods can be utilised as vehicle fuel without generating uranium waste. They can be loaded into the fuel tanks of wheeled vehicles, although caution is necessary due to the radiation they emit. Uranium fuel rods are a vital component in the process of converting nuclear energy into electricity, providing a reliable and carbon-free source of power.
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Steam generation
Nuclear power plants use steam generators to convert water into steam using heat from a nuclear reactor core. This process is essential for the operation and safety of the plant, as it cools the primary circuit and the nuclear fuel core.
A steam generator is a heat exchanger that transfers heat from the reactor core to water, producing steam. This steam is then channelled to spin turbines, activating an electric generator to create electricity. The steam generator is a key energy transfer device, connecting the primary and secondary loop systems of the nuclear reactor. In the primary loop, the coolant (treated water) is pumped through the reactor core, where it absorbs heat from the fuel rods. This water is maintained at high pressure to prevent boiling. It then passes through the steam generator, transferring its heat to lower-pressure water in the secondary loop, which is allowed to boil and produce steam. This two-loop system is typical of pressurised water reactors (PWRs), the most common nuclear power plant design worldwide. PWRs use high-purity water as the primary coolant, which absorbs heat from the reactor core and transfers it to the steam generator.
The secondary-side steam is then delivered to the turbines to generate electricity. After turning the turbines, the steam is condensed back into water and reused in the heating process. This is achieved through a tertiary cooling system, which may use water from a river, lake, or ocean, or recirculate water to cooling towers. This condensed steam returns to the steam generator to be reheated and used again.
Steam generators are a critical component of nuclear power plants, and their design has evolved to improve safety and performance. They face harsh operating conditions, with high heat and pressure, and corrosion has been a significant issue. Different types of steam generators, such as straight-tube and helicoil-tube, have been developed to improve heat exchange and address issues like non-uniformity in convective heat transfer.
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Turbine activation
Nuclear power is a significant source of electricity globally, with over 400 commercial reactors in operation across the world. Nuclear reactors are the heart of a nuclear power plant, and they contain and control nuclear chain reactions that produce heat through a process called nuclear fission. This fission process involves splitting atoms, which releases a large amount of energy in the form of heat and radiation.
Nuclear fuel is derived from uranium ore, which is mined and processed into small ceramic pellets. These pellets are stacked into metal tubes called fuel rods, and these rods are bundled together to form a fuel assembly. The reactor core is made up of hundreds of these assemblies, depending on the desired power level.
The heat generated by fission turns the water in the reactor core into steam, which is then used to spin a turbine. This turbine activation process is key to generating electricity. The steam produced by the reactor core is directed through the reactor steam system to the turbine, specifically to the turbine blades. As the steam enters the turbine, it turns the blades, activating them and setting them in motion. This mechanical energy is then converted into electrical energy through the use of generators. The spinning turbine blades drive these generators, which produce electricity.
The type of reactor used influences the specific process of turbine activation. For example, in boiling water reactors (BWRs), which make up about a third of US reactors, water is heated and turned into steam directly inside the reactor vessel. This steam is then fed directly to the turbine through pipes. In pressurized water reactors (PWRs), which are the most common type globally and constitute over 65% of US reactors, water is pumped into the reactor core under high pressure to prevent boiling. The steam produced is then channelled to a separate water source in a heat exchanger to create the steam that will turn the turbine.
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Low-carbon electricity
Nuclear energy is a low-carbon electricity source that has been in use since the early 1950s. It is produced by nuclear fission, the process of splitting atoms to release energy. Nuclear power plants use nuclear reactors to control these chain reactions, fuelled mostly by uranium-235, to generate heat through fission. This heat is then transferred to water, turning it into pressurised steam. The steam is then released through turbines, turning the steam's heat energy into kinetic energy that activates electrical generators to produce electricity.
Nuclear power is a low-carbon energy source as it does not produce CO2 during its operation, unlike coal, oil or gas power plants. Nuclear power plants produce nearly zero carbon dioxide or other greenhouse gas emissions, and they do not produce air pollutants associated with burning fossil fuels. Nuclear power has been estimated to account for around 25% of all low-carbon electricity globally, and over 70 gigatonnes of carbon dioxide have been prevented from being emitted in the past 50 years due to nuclear power plants.
Nuclear power is also more efficient than other power sources, as a minuscule amount of fuel is required to generate the same amount of electricity as a coal or gas power plant. For example, 1 kg of uranium contains the same amount of energy as 2.7 million kg of coal. This makes nuclear fuel a reliable source of energy for decades to come.
Nuclear power is crucial in meeting climate change goals, and it is treated as an essential part of carbon-neutral goals by many countries. However, concerns remain about the disposal of spent fuel from reactors, as there is no definitive way to dispose of it indefinitely without risk.
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Frequently asked questions
Nuclear energy is converted into electricity by using the heat from nuclear fission to produce steam, which then turns a turbine generator. Nuclear power plants do not burn fuel and so do not produce greenhouse gas emissions.
Nuclear fission is a reaction where the nucleus of an atom splits into two or more smaller nuclei and releases energy. Nuclear reactors house and control this process, which is fuelled by uranium.
Uranium is processed into small ceramic pellets and stacked together into sealed metal tubes called fuel rods. These rods are then immersed in water, which acts as a coolant and a moderator. The water is heated by nuclear fission and then pumped into tubes inside a heat exchanger.
The tubes in the heat exchanger heat a separate water source to create steam. This steam then turns a turbine, which activates an electric generator to produce electricity.
