Chernobyl can't happen again. It couldn't happen with any Western reactor, either.
Fukushima certainly could happen again, and I suspect all the currently popular fail-safe reactor designs have some ingenious failure mode that leaks radioactivity. What makes you think Fukushima was really that bad? It exposed few people to dangerous levels of radiation, and didn't really render that much land uninhabitable. It got a whole lot more press than the tsunami, though.
We have to compare it to what happens to other power sources, and they can destroy land too. In about two hundred years, the cesium contamination from Fukushima will be something like 97% gone. I think today's open-pit mines are likely to be around longer than that. I'm not claiming Fukushima was benign, but it's the worst thing that happened in decades with reactors that had 1950s-style safety features, and all other forms of power have been killing people and sometimes devastating areas through those decades.