[en] For all PWR-type reactors built in France, the seismic risk has been taken into account as early as in the design phase. The RFS-2001-01 rule describes the method to assess the seismic risk to take into account for a site. This method is deterministic and relies on an historical study of the seismicity of the region and on a tectonic analysis of the site itself. This method allows the determination of a maximal historically likely earthquake to which an add-on factor allows the taking into account of the uncertainty. One of the measures taken after Fukushima, was the re-calculation of the seismic risk by extending to 20.000 years the 1000 year long period over which the seismic activity was assessed. The feedback of the nuclear power plants that have undergone earthquakes around the world shows an important robustness even for the Fukushima station. This robustness is certainly due to the safety margin. (A.C.)