Nuclear is probably the most controversial of all energy sources. Denounced by some for the radioactive waste it generates and the risks of nuclear accidents, others claim that it plays an essential role in energy transition.
According to the latest forecasts by the International Energy Agency, the world's nuclear energy production will increase by 15% by 2030. However, it will figure less prominently in countries' energy mix.
|In Belgium, the last nuclear power stations are set to close by 2025. In September 2020, a federal government agreement confirmed this phase-out. It does, however, provide for a possible extension of the Tihange 3 and Doel 4 units if there is still uncertainty about the country's security of supply at the end of 2021|
Conversely, some countries have decided to invest in the revival of nuclear power:
In between these approaches, some countries have not yet clearly decided on their nuclear policy.
In France, the share of nuclear power in the energy mix is to be reduced to 50% by 2035. However, two scenarios are being weighed up for the future:
Over the past 50 years, the United States has also invested little in nuclear power. But this could change, as the Democrats have said they are in favour of investing in small modular reactors (small, medium-power nuclear reactors) to deal with the climate emergency.
The big advantage of nuclear power is that it does not emit greenhouse gases. For its advocates, nuclear power is essential to keep global warming below 2°C by limiting greenhouse gas emissions.
Unlike renewable energies, the production of nuclear energy does not depend on climatic conditions.
When wind turbines do not turn and solar panels do not produce enough electricity, it can take over to ensure that enough electricity is produced to meet the needs of consumers and in turn contribute to the balance of the power grid.
Although nuclear energy is not set to disappear overnight, this does not mean that the technology used will remain the same as that used until today. Several innovations are currently being explored and researched.
These 'mini-reactors' are small modules with a capacity of 10 MW to 300 MW (compared to 500 MW to over 1650 MW for a conventional nuclear reactor), and can provide the electricity needed for industrial sites or remote areas.
Flexible and self-contained, SMRs can easily meet fluctuating energy demands and are likely be used to top up the production of conventional nuclear reactors.
These 4th generation reactors (unlike the 3rd generation reactors currently in service) could operate with uranium-238, which constitutes 99.3% of natural uranium, rather than uranium-235 (0.7% of natural uranium).
Several tests are underway, notably in France, where sodium-cooled fast neutron reactors are being tested.
More abundant than uranium, almost 100% of thorium-232 can also be used as a fuel. That is why research is underway to use this fuel to power nuclear reactors.
In these reactors, the fuel is in liquid form, dissolved in molten salt.
While nuclear fission is about breaking an atomic nucleus to release energy, nuclear fusion is about fusing light atomic atoms together. This phenomenon, which occurs naturally in the core of stars like the sun and releases enormous amounts of energy, is very complicated to reproduce.
To date, nuclear fusion remains experimental and only a few Chinese or international research reactors are currently able to operate for a few seconds.
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