All of them, on both sides of the "green spectrum" are either insane or ignoring reality.
Closing existing nuclear power plants is wasteful if they are still safe to run.
Creating new fission based power plants is useless because they will not be ready in time to make a bit of difference, separate from the fact that increasing surface water temperatures will render most of these units unusable/inefficient in the next decade or so.
Renewables+storage will be safer and at a much lower cost.
None of this will help save the "planet". Reduction of (the growth of) carbon emissions is insufficient to cool the planet down in any way shape or form to a degree that helps in time to prevent disaster/extinction.
Increasing earths albedo is the only method currently achievable to get from +2W/m² forcing to -2W in time to save at least something of our current habitat but those sort of literally world saving options is drowned out by a discussion about how big energy can wring more subsidies from the public coffers by promising that Nuclear will save the day and having "Green" proponents make the argument for them. Don't be fooled. Stop wasting public money on big, slow and ultimately wasteful projects just so energy companies can keep themselves alive.