Nuclear chain reaction the last one called ""Perfectionnement aux charges explosives"" was the first patent for the atomic bomb and is filed as patent n°445686 by the Caisse nationale de Recherche Scientifique. In parallel, Szilárd and Enrico Fermi in New York made the same analysis. This discovery prompted the letter from Szilárd and signed by Albert Einstein to President Franklin D. Roosevelt, warning of the possibility that Nazi Germany might be attempting to build an atomic bomb. On December 2, 1942, a team led by Enrico Fermi produced the first artificial self-sustaining nuclear chain reaction with the Chicago Pile-1 (CP-1) experimental reactor in
Enrico Fermi Nuclear Power Plant (Italy) Enrico Fermi Nuclear Power Plant (Italy) Enrico Fermi Nuclear Power Plant was a nuclear power plant at Trino (often referred to as ‘Trino Vercellese’, meaning ‘Trino in the Province of Vercelli’), in north-west Italy. Consisting of one 260 megawatt pressurized water reactor (PWR) from the vendor Westinghouse Electric Corporation, it operated from 1964 until 1990. Trino was in 1964 the third ever commercially operated PWR worldwide, and it had the second highest megawatt-capacity of them. It was closed down following the Italian nuclear power referendum, 1987. The experimental enrichment plant, EUREX, near the power plant, was closed down in 1984.