The construction of the power station, which was undertaken jointly by
SIMEA SpA and the 'Nuclear Power Group' consortium (Backed by
AEI,
John Thompson,
C. A. Parsons and Company,
Head Wrightson and
A. Reyrolle & Company) started in 1958, as a key component of Italy's nascent nuclear weapons program. The first criticality occurred in December 1962, and the first connection to the distribution grid in May 1963. Commercial operation took place starting from January 1964. Originally the station was rated at 210 MWe, making it the largest nuclear power plant in Europe. The danger of significant oxidation of mild steel components by the high temperature carbon dioxide coolant required (in 1969) a reduction in
operating temperature from 390 to 360
°C, which reduced power by 24%, down to 160 MWe (Net. 153 MWe). In 1985 its license was renewed to operate until at least 1992, but after the
Chernobyl disaster it was shut down early in 1987 as the result of a referendum. During its activity, the plant produced a total of 26 TWh of electric power. ==Specification==