That one is actually easy to answer: Most of the European left does not like nuclear because of cost externalization - let's be real: it's not today's rate payers that are going to fund the decades worth of work needed to dismantle the plants (e.g. the AKW Greifswald in Germany has already been taking 30 years with at least 15 more years planned [1]) or to safely store all that nuclear waste for likely hundreds if not thousands of years, it's the tax payers of the future. On top of that come the enormous and un-insurable financial risks of disasters: Chernobyl happened 35 years ago and still you can't eat game or shrooms in Bavaria without running them in front of a Geiger counter (not to mention that Chernobyl is in an active war zone with radiation-releasing disruptions having happened as a part of the war, as are about a dozen other plants that are, to make it worse, even being actively shot at), the cost of the Fukushima cleanup is estimated to run into 200 billion dollars.

In contrast, the European right wing loves nuclear precisely because it is so "cheap" on paper with ~13 ct/kWh... it's their usual playbook of conveniently ignoring the above-mentioned externalities.

[1] https://www.zeit.de/2021/42/rueckbau-kernkraftwerke-atomauss...