France is a country that relies quite heavily on nuclear power, the EDF website lists 58 reactors operating at 19 different locations throughout the French mainland. (Edit: Thanks to a French forum colleague, here's a LINK to a more comprehensive map of nuclear activities in France).
So how does this compare with the seismically active areas of France? Here are a couple of images to show just how the two overlap...
Firstly the seismic activity.
Secondly the nuclear locations.
Generally I think we're pretty safe, the seismic activity in France is at the lower end of the Richter scale although there are a couple of facilities up on the northern coast that seems to coincide with recent activity.
Time of course will tell, but I'm not personally worried - there are a lot of other more likely scenarios out there that could 'get us' first.