 The plan envisaged the construction of around 80 nuclear plants by 1985 and a total of 170 plants by 2000.Work on the first three plants, at Tricastin, Gravelines, and Dampierre started the same year and France installed 56 reactors over the next 15 years.Following the 2011 Fukushima I nuclear accidents, the head of France's nuclear safety agency said that France needed to upgrade the protection of vital functions in all its nuclear reactors to avoid a disaster in the event of a natural calamity, adding there was no need to close any plants.