other energy sources are already cheaper [than nuclear]
That depends on how you account for the strip mining, fracking, CO2 and things like radiation (from coal plants) spewing into the atmosphere (which we all share). There aren't low carbon sources that are both cheaper than nuclear and suitable for base load.
safety is still somewhat lacking (accidents, like Fukushima, still happen)
And for perspective, coal plants emit more radiation when working normally, 24x7.
Safer and cheaper nuclear reactors should be possible.
Are possible, and much safer technology (than was in place at any of the high-profile incidents) exists today.