Nuclear reactors utilize the process of nuclear fission to generate energy. During nuclear fission, the nucleus of an atom is split into two or more smaller nuclei, releasing a large amount of energy.

The Soviet Union was the first country to develop and operate a nuclear power plant. The Obninsk Nuclear Power Plant, located in Kaluga Oblast, Russia, began operation in 1954.

Pressurized Water Reactors (PWRs) are the most common type of nuclear reactor used for electricity generation worldwide. They utilize ordinary water as both the coolant and the neutron moderator.

The United States has the largest number of operating nuclear power plants in the world, with over 90 active reactors. France is the second largest producer of nuclear energy, with around 58 operating reactors.

Uranium is the primary fuel used in nuclear reactors. It is a naturally occurring element that can be enriched to increase its concentration of the fissile isotope uranium-235.

Australia has the largest reserves of uranium in the world, estimated at around 1.7 million tonnes. Kazakhstan is the second largest producer of uranium, with reserves of around 1.5 million tonnes.

Enrichment is the process of separating fissile isotopes from non-fissile isotopes in uranium ore. This is done to increase the concentration of the fissile isotope uranium-235, which is used as fuel in nuclear reactors.

The primary waste product of nuclear fission is radioactive waste. This waste contains highly radioactive materials that must be safely managed and disposed of.

The United States has the largest repository for high-level radioactive waste in the world, located at the Waste Isolation Pilot Plant (WIPP) in New Mexico.

Steam turbines are the primary method for generating electricity from nuclear energy. In a nuclear power plant, the heat produced by nuclear fission is used to generate steam, which drives a steam turbine connected to an electrical generator.

France has the highest percentage of electricity generated from nuclear energy in the world, with over 70% of its electricity coming from nuclear power plants.

The primary safety concern associated with nuclear power plants is the potential for nuclear accidents, which can result in the release of radioactive materials into the environment.

The Chernobyl disaster, which occurred in 1986 in Ukraine, is considered the most severe nuclear accident in history. It resulted in the release of large amounts of radioactive materials into the environment and had long-lasting consequences for the health and well-being of people in the affected areas.

The International Atomic Energy Agency (IAEA) is the primary international organization responsible for promoting the safe and responsible use of nuclear energy. It works to ensure that nuclear energy is used for peaceful purposes and to minimize the risks associated with its use.

The future of nuclear energy in the global energy mix is uncertain. Some countries are investing in nuclear energy as a low-carbon source of electricity, while others are phasing out nuclear power due to safety concerns and the high costs associated with building and operating nuclear power plants.