Sylvie Willis
Nuclear fuel is a topic of great interest and debate, with some arguing that it is an inexhaustible source of energy, while others believe we are running out soon. Uranium, a relatively common metal found in rocks and seawater, is the primary fuel used in nuclear reactors. Estimates suggest that there are 6.5 sextillion tons of uranium in the Earth's crust, which is continuously replenished through natural processes. With the use of advanced reactors and breeding technology, experts predict that nuclear fuel could last for thousands of years, meeting humanity's energy needs. However, at the current rate of consumption and without new technologies, estimates range from 80 to 25,000 years, highlighting the importance of sustainable practices and exploration of alternative energy sources.
| Characteristics | Values |
|---|---|
| Uranium in seawater | 4000 million tonnes |
| Uranium in the Earth's crust | 6.5e13 tonnes (65 trillion) |
| Thorium in the Earth's crust | 6.3 million tonnes |
| Uranium in Greenland | 228,000 tonnes |
| Uranium in Sweden | 300,000 tonnes |
| Uranium in Finland | 25,500 tonnes |
| Uranium identified | 5.5 million metric tons |
| Uranium undiscovered | 10.5 million metric tons |
| Uranium supply at current consumption rate | 230 years |
| Uranium supply with improvements in extraction technology | At least double the current supply |
| Uranium supply with more enrichment work | 30% reduction in uranium needs |
| Uranium supply with new technologies | 80 to 150 years |
| Uranium supply with breeder reactors and thorium | 25,000 years |
| Uranium supply with breeder reactors | 4 billion years |
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What You'll Learn
Uranium in seawater
Uranium is a relatively common element on Earth, but mineable terrestrial resources are limited. Uranium in seawater is present at low concentrations, but the vast volume of water in the oceans means there are about 4000 million tonnes of uranium in seawater. This is over 1,000 times more than what's on land, and if successfully harvested, it could meet worldwide demand for the foreseeable future.
The extraction of uranium from seawater has been a topic of research since the 1950s, with sporadic interest. Uranium extraction from seawater is technically challenging due to the low concentration of uranium and the complexity of the oceanic environment. The annual possible quantity of uranium that can be extracted using existing industrial flow rates is very low, and huge quantities of water must be treated. For example, to produce the annual world uranium consumption of around 65,000 tU, all the uranium in two billion tonnes of seawater (the volume equivalent of the entire North Sea) would need to be extracted.
The energy required to extract uranium from seawater using current methods is also greater than the energy produced by the extracted uranium. This makes seawater uranium extraction impractical with current technology. However, recent research has developed new methods to extract uranium from seawater more efficiently. One such method uses a coated cloth with a natural, porous structure that can trap uranyl ions effectively. This cloth has been shown to extract 12.6 milligrams of uranium per gram of coated material over 24 days, which is higher than most other uranium-extracting materials.
The efficient extraction of uranium from seawater is expected to provide a virtually infinite fuel source for nuclear reactors, enabling the sustainable development of nuclear energy. Seawater uranium extraction could be a significant step towards achieving carbon neutralization, as nuclear energy provides constant, reliable, and almost carbon-free power.
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Uranium in the Earth's crust
Uranium is a naturally occurring element that has been present on Earth since its formation. It is a key component of nuclear fuel, and its long-lived radioactivity makes it ideal for use in nuclear reactors and for dating geological processes and understanding the evolution of the Earth. Uranium is found in the Earth's crust, with an average crustal concentration of about 2.8 parts per million. The overall abundance of uranium in the Earth's crust is approximately 4 parts per million, and it is concentrated in several minerals, including pitchblende, autunite, torbernite, and carnotite.
The Earth's crust contains a significant amount of uranium, with estimates ranging from 5.5 million to 100 trillion tonnes. The large range in estimates is due to the varying depths considered in the calculations, with the higher estimate considering the Earth's crust to a depth of 25 km. The abundance of uranium in the Earth's crust is a result of its lithophile nature, which leads to its accumulation in the crust. Uranium is also found in the oceans, with an average concentration of 0.003 parts per million, contributing to approximately 10 billion tonnes of uranium.
The accessibility of uranium resources is an important consideration. While there may be large amounts of uranium in the Earth's core, mining it is not feasible with current technology. Therefore, the commercially viable uranium deposits are those found in the Earth's crust and oceans. At current prices, there are around 5.5 million tonnes of uranium in ore deposits that are commercially viable, and this amount could increase to 35 million tonnes if prices were to rise.
The uranium in the Earth's crust is continuously replenished through erosion, runoff, and plate tectonics. Uranium isotopes have been instrumental in understanding the Earth's crust and its recycling back into the interior. By studying the distinct 'fingerprint' left by uranium isotopes in volcanic rocks, geologists have gained insights into the age and origin of the crust and its movement into the Earth's interior through subduction.
The use of uranium as nuclear fuel has been a subject of debate, with some arguing that nuclear fuel is inexhaustible and circular, while others believe we will run out soon. Uranium in the Earth's crust and seawater provides a significant resource for nuclear fuel, and advancements in extraction technology are expected to increase the accessibility of these resources.
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Thorium as nuclear fuel
The Earth has an estimated 6.5 trillion tons of uranium in its crust, which is expected to last for about 230 years at the current consumption rate. However, nuclear fuel sources also include uranium in seawater and through breeder reactors, which can make nuclear fuel a virtually inexhaustible source of energy.
Thorium is a metal that has been explored as an alternative nuclear fuel to uranium. It was initially investigated for use in nuclear weapons and power generation. Thorium is about four times more abundant than uranium in the Earth's crust and has the potential to provide a clean and limitless source of energy. Several countries are investing in thorium as a potential fuel source for molten salt reactors, one of the next generations of nuclear power.
Thorium has several advantages over uranium as a nuclear fuel. Firstly, thorium waste is less radioactive and requires less geological disposal and waste management. The radioactivity of thorium waste drops to safe levels within a few hundred years, compared to tens of thousands of years for uranium waste. Secondly, thorium does not require expensive fuel enrichment like uranium, as all-natural thorium can be used as fuel. This makes thorium a more cost-effective option. Thirdly, thorium produces less waste than plutonium or uranium, making it a more attractive option for the future of nuclear energy.
However, there are also some disadvantages to using thorium as a nuclear fuel. Thorium is not fissile and requires a fissile material like uranium-235 or plutonium to initiate and sustain the chain reaction. Additionally, there is a lack of technology developed to utilize thorium fuel in reactors. Thorium has been tested as a fuel in various types of nuclear reactors in countries like the US, Germany, the Netherlands, the UK, and India. China has constructed an experimental thorium reactor in Wuwei, and France is developing a project called MSFR (Molten Salt Fast Reactor) using thorium.
While thorium has been explored as a potential alternative to uranium, uranium-fueled reactors were prioritized due to their higher breeding rate and proven research. Despite this, thorium remains an attractive option for the future of nuclear energy due to its abundance, reduced waste production, and cost-effectiveness.
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How long will nuclear fuel last?
The duration of nuclear fuel availability depends on various factors, including extraction methods, reactor types, and fuel efficiency.
Uranium, the primary element used in nuclear fuel, is found worldwide and is considered a relatively common element. Identified uranium resources total 5.5 million metric tons, with an additional 10.5 million metric tons remaining undiscovered, amounting to a roughly 230-year supply at the current consumption rate. However, this estimate assumes the use of light-water reactors (LWRs) with low-enriched uranium (LEU) fuel.
The duration of nuclear fuel supplies can be significantly influenced by the type of reactor used. Breeder reactors, for example, are highly fuel-efficient compared to non-breeder reactors. Breeder reactors can utilize natural or depleted uranium, as well as thorium, and have the potential to power humanity for more than four billion years. In contrast, non-breeder reactors are considered impractical for low-grade uranium resources due to their low fuel efficiency.
Advancements in extraction technology and reactor construction can further extend the longevity of nuclear fuel reserves. Improvements in uranium extraction methods, such as seawater uranium extraction, can enhance the accessibility of uranium resources. Additionally, with better reactor construction and public acceptance, the sustainability of nuclear fuel can be improved.
The nuclear fuel cycle, which involves mining, milling, conversion, enrichment, and fuel fabrication, also plays a role in the duration of nuclear fuel. Reprocessing used fuel allows for the recycling of uranium, reducing the need for fresh uranium resources. Advancements in equipment and fuel assemblies have led to higher burn-up rates, resulting in longer operation cycles and reduced fuel assembly discharge.
While some claim that nuclear fuel is inexhaustible, similar to sunlight, others argue that we will run out soon. The duration of nuclear fuel availability depends on our ability to efficiently extract, utilize, and recycle uranium resources, as well as our progress in developing advanced reactor technologies.
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Where does our nuclear fuel come from?
Nuclear fuel refers to any fissile material used by nuclear power stations or other nuclear devices to generate energy. Uranium is the most common nuclear fuel, with nuclear power plants primarily using a specific type of uranium (U-235) for nuclear fission because its atoms are easily split apart. Although uranium is about 100 times more common than silver, U-235 is relatively rare, at just over 0.7% of natural uranium.
Uranium is mined from ore deposits, with identified uranium resources totalling 5.5 million metric tons, and an additional 10.5 million metric tons remaining undiscovered—a roughly 230-year supply at today's consumption rate. Uranium can also be found in seawater, with about 4000 million tons of uranium present, and in the Earth's crust, with about 65 trillion tons of uranium in the crust that continuously replenishes the uranium in seawater through erosion, runoff, and plate tectonics.
The mined uranium ore is processed to produce uranium concentrate, which can be used as fuel. The uranium concentrate is first converted into uranium hexafluoride gas, which is then enriched to increase the level of U-235. The enriched uranium is then fabricated into reactor fuel pellets and fuel rods, which are used in nuclear reactors to generate energy.
In addition to uranium, other materials have been used as nuclear fuel, including metal fuels such as uranium aluminium, uranium zirconium, and uranium silicon. These metal fuels have the advantage of higher heat conductivity than oxide fuels, but cannot survive equally high temperatures. Uranium nitride has also been proposed as a nuclear fuel due to its high melting point, but the nitrogen required for such fuel would be expensive and likely require pyroprocessing to recover.
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Frequently asked questions
There are differing estimates for how much nuclear fuel is on Earth, with some estimates placing the total amount of uranium in the Earth's crust at 65 trillion tons.
Nuclear fuel will last for at least 4 billion years, with some sources claiming that it is essentially inexhaustible.
The longevity of nuclear fuel depends on factors such as consumption rates, extraction technology, and the development of new reactor technologies.
Nuclear fuel, specifically uranium, is a relatively common metal found in rocks and seawater. Each average continental crustal rock contains 20 times more nuclear energy than an equal mass of coal.
Thorium is reported to be about three times as abundant as uranium in the Earth's crust and can be used as fuel in CANDU reactors or reactors designed specifically for thorium fuel cycles.
