Glossaire :Unglazed collector [...] Uranium-235

Unglazed collector (see the French definition )

A type of solar collector that is a rubber or plastic device that can absorb heat.

Upgrader (see the French definition )

An upgrader is a facility that can upgrade heavy oil into light and highly desulfurized petroleum. An example of this kind of facility is found in San José, Venezuela.

Upgrading (see the French definition )

Upgrading is all of the refining techniques that are used to remove unwanted components and to alter the characteristics of some products so that they comply with the necessary standards.

Uranium (see the French definition )

Uranium is a hard, gray and very dense metal that naturally occurs in the earth’s crust. Once extracted from mines, it must undergo a number of transformations before it can be used in nuclear fission power plants.

Uranium-235 (see the French definition )

Uranium-235 (U235) is one of the two natural isotopes (elements whose nuclei have the same number of protons but a different number of neutrons) of uranium. Natural uranium contains 99.3% U238 and 0.7 % U235. U235, however, is the only isotope that is fissile (capable of undergoing nuclear fission). Uranium has to be enriched with U235 before it can be used in nuclear power plants.