I find it always fascinating, that the same groups (Greenpeace, etc.) are always quick to point to UN reports about climate change (like the IPCC report) as if they were gospel but all the reports of the UN about Chernobyl and Fukushima are supposedly fake. I personally believe both are correct.

After extensive, long-term, high-quality studies of the effects of (mid- to low-level) radiation on populations after Chernobyl [1], Fukushima (cf. article) and even Hiroshima [2], it is pretty safe to say that radiation poses a much smaller risk to humans than is often propagated in the horror scenarios of many environmental groups. The theory most of these scenarios are based on, ie. that every little amount of radiation lineraly increases the risks for cancer, is pretty much debunked. So, yes, nuclear is a dangerous technology, esp. if we keep stopping reserch and progress happening on a large scale and don't replace the 50 year old reactors. But coal kills tens of thousands every year and nuclear is still one of the few relatively reliable, almost CO2 neutral power sources we have.

[1] https://www.un.org/press/en/2005/dev2539.doc.htm [2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3907953/