The question is deliberately asked about how many should exist, thereby giving you the option of giving answers that effectively means taking nuclear plants off-line. Including total scrapping of nuclear power. If you are fine with todays level but do not want more reactors then 400-500 would be your range.

I am mostly curious of what the various pro-/anti- stances means in terms of amount of nuclear power, right now measured in reactors.

Sweden's finest (and perhaps only) collaborative, leftist e-newspaper Synapze.se