To get political points from the anti nuclear crowd, which is huge in Europe. I think proximity to Chernobyl is probably the reason why that movement has grown so badly out of proportion
It’s a shockingly strong movement even still in the US. A lot of education growing up was about how nuclear sludge would ruin everything and basically every “green” movement would still fight nuclear tooth and nail through all sorts of scare tactics.
It’s only in the post climate change world that some are coming around to the reality that France exists and isn’t a smoking radioactive crater.
The German Green party, which has taken part in national governments and is the biggest party in several states, has basically founded to oppose nuclear power.