No "clean" or "renewable" energy source scales the way nuclear can.
No "clean" or "renewable" energy source can provide on-demand base-load power the way nuclear can.
Reliability can be built into nuclear plants in ways that distributed "small" clean power cannot match.
Safety record of nuclear power generation speaks for itself, esp. when context is provided (coal, hydro).
Waste management is an issue that is primarily an engineering challenge, not an obstacle.
Can designs be improved? Certainly, and much work is ongoing in this space (Toshiba, Hyperion, others).
Over the long term, nuclear is the cleanest base-load power source we have, and it is inevitable that more nuclear power plants will be built and brought on-line worldwide.