 Commercial operation took place starting from January 1964.The plant was originally rated at 210 MWe, but 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.In 1985 its license was renewed to operate until at least 1992, but after the Chernobyl disaster it was shut down early in 1987.