Nuclear Energy

Nuclear energy is the energy stored inside the nucleus, the central part of an atom. It can be released through two different processes: nuclear fission and nuclear fusion. Today's nuclear power plants use fission, in which the nuclei of heavy atoms such as uranium split into smaller nuclei. This reaction releases a large amount of energy as heat, along with neutrons that can trigger further fission reactions.

The heat is used to produce steam, which spins turbines connected to electrical generators. Fusion works in the opposite way by joining light atomic nuclei together. It powers the Sun and other stars, but producing controlled fusion on Earth for electricity remains a major scientific and engineering challenge.

Nuclear power stations generate electricity with very low direct emissions of carbon dioxide during operation, making them an important source of low-carbon energy in many countries. However, they also produce radioactive waste that must be handled and stored safely for long periods. Nuclear reactors are designed with multiple safety systems to reduce the risk of accidents, although rare failures have shown that strict safety measures are essential.

Beyond electricity production, nuclear technology is also used in medicine to diagnose and treat diseases, in industry for inspection and measurement, and in scientific research. Understanding nuclear energy requires balancing its benefits, its risks and the technologies used to manage them responsibly.