Just as a reminder to everyone; nuclear causes around 1-2 orders of magnitude more deaths per produced terawatt-hour of energy than the usual fossil fuel suspects (oil, coal, natural gas), and this does not exclude large-scale nuclear accidents (or in the case of Chernobyl, a downright disaster). I'd live next to a nuclear power plant every time than a coal power plant.
Now if a country has to choose between nuclear and staying on fossile, then the choice should be nuclear every time. Eventually we may have the available technology to phase out both, but at the moment this is not feasible. Renewables are cheap, clean and available in volume, but they are not stable in output levels. Only we can store enough energy in various forms, then we could switch to 100% renewable. We are not there yet and are not likely to get their in the mid-term.