Nuclear has a huge waste issue, persisting between hundreds and a million years.
Storage isn't that expensive, E.g. through gas.
E.g. Germany maintenances Gas storage (currently filled with non renewable gas) that can power the entire country a Quarter of a year. Without the actual need through renewables.
Nuclear with waste management would have to be cheaper than that.
(Aside from the subjective evaluation of the associated risk of nuclear energy)
Hydro is bad for the local environment.
Nuclear has a minor waste problem which isn't really that bad.
None of these are perfect solutions. Nuclear shouldn't be ruled out of a green mix.