EDF has been quietly acquiring land around existing nuclear power plants for many years (like Cattenom, near Luxembourg), with the unstated but likely goal of expanding them rather than going for brand new sites.
In some cases EDF even planned building more reactors from the very beginning, for example at the nuclear power plant of Belleville-sur-Loire: everything was planned for 4 reactors, but only 2 were built. So they can build two extra right there, no need to find a new site.
The current not so small problem is that EDF needs to learn how to build nuclear reactors again. That's what they are currently doing, at great cost and great delays... But if the political will is there, they can start to break ground quite literally tomorrow.
In some cases EDF even planned building more reactors from the very beginning, for example at the nuclear power plant of Belleville-sur-Loire: everything was planned for 4 reactors, but only 2 were built. So they can build two extra right there, no need to find a new site.
The current not so small problem is that EDF needs to learn how to build nuclear reactors again. That's what they are currently doing, at great cost and great delays... But if the political will is there, they can start to break ground quite literally tomorrow.