The world’s first nuclear reactor was completed in 1942, and housed under the abandoned stands of the Chicago University stadium. This ‘Fermi Pile’, as it was then known, used a uranium source with graphite blocks as moderators, designed by a team of physicists led by the Nobel Laureate Enrico Fermi . The pile was switched on for the first time on the 2nd of December 1942, and the chain reactions started successfully. Over the following years, several reactors were built in Washington State – in the desert environment of Hanford – with the aim of producing enough plutonium to build the first atomic bombs.
A peaceful use of the atom
In 2014, there was over 437 nuclear reactors in activity worldwide, all distant descendants of Fermi’s atomic pile and the nuclear reactors of Hanford. Many modern reactors have an electrical power of 1 gigawatt each. They have a combined output of 350 GW, producing 17% of the world’s energy supply. The part that nuclear energy plays, however, differs from country to country. In Europe, for instance, France and Belgium are both heavily reliant on nuclear energy (in France, nuclear energy makes up 75% of the total supply), whereas England (35%) and Germany (33%) use far less. Italy’s four power plants were shut down after Chernobyl, and the country currently obtains 0% of its energy from nuclear processes. Outside Europe, the resource-rich United States have little need for nuclear energy, but in Japan, a country comparatively poor in natural energy sources, 33% of the energy is supplied by nuclear reactors. Asia is home to the two countries currently most heavily reliant on nuclear energy for their development: Korea and China.
There are two types of second generation reactors that are based on enriched uranium: those that use boiling water and those using pressurized water. In Europe, almost 80% of reactors are PWRs (Pressurized Water Reactors), by far the most common design worldwide. Recent advances in the processing of nuclear waste have also allowed for the recycling of plutonium extracted from the spent fuel, leading to increased energy production per ton of uranium.
Reactors using fast neutrons might be reactors of the future. They are the most efficient and attractive, since they are able to regenerate the fissile nuclei they burn. At the moment, fast neutrons are used by only a few reactors geared towards nuclear research. The French SuperPhenix was the only such reactor to reach industrial standards, but was closed down in 1997.
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