The newer types of reactors - gen 3 are way safer than a Chernobyl. I.e. a meltdown could not happen
Gen III reactors have a core catcher[1] to handle a meltdown, in addition to many features making a meltdown even less likely to happen.
[1]: https://www.forbes.com/sites/jamesconca/2013/09/29/forget-ea...
Every technology has costs. Fossil fuels are killing hundreds of thousands and blighting the lives of tens of millions of asthma sufferers every year.