fukoshima was an old generator with a fatal design flaw (the pumps that stopped working cos there was no power to run them). Modern fast breeder type reactors are inherantly safe. They automatically shutdown if they over heat, they operate at atmosperic pressures so can't "explode" and the coolant is held above the chamber, so that when the reactor gets too hot, valves (that are held shut by force) automatically open to cool the reactor.
The problem we face is this (and yet again I am repeating myself) we have to keep the lights on. Not only for us in the west, but also for growth in places like china, india and africa. To do that we need to generate lots of power. We can't keep burning fossil fuels to do so, as unchecked climate change will kill us more surely than a thousand nuclear incidents. Renewables, at this point in time, cannot generate enough energy to meet our current demands, let along the demand of a growing world. maybe they will in the future, with enough investment and commitment. Nuclear is the least bad option of those on the table.