This one, for example: https://en.wikipedia.org/wiki/Chernobyl:_Consequences_of_the...
The social/economic plane is known:
According to Mikhail Gorbachev, the Soviet Union spent ((...)) $35.7 billion in today's dollars) on containment and decontamination, virtually bankrupting itself.
https://en.wikipedia.org/wiki/Chernobyl_disaster#Social_econ...
Chernobyl disaster was detected when a radioactive detector suddenly got ballistic in a restroom at 150 Km of Stockholm. This happened in the first 24 hours of an event triggered 1260 Km far away. Is the same distance than lies between Warsaw and Brussels and this is just the radius in a circunference dictated by chance by the dominant winds. Germany has still some parts closed to boar hunting by it.
It can cover large areas of Earth, and will do it really fast.
Take a look at what it's like in the Chernobyl exclusion zone today: https://thoughtscapism.com/2019/05/08/what-about-radioactive...
For comparison with other energy sources, Banqiao dam failure killed 100,000 [1] and fossil fuels (84% of the world's total energy) kill about 4.3 million people every single year [2]. This is why hydro and fossil emissions are regulated too. The regulations are necessary and useful. The Clean Air Act of 1970 has saved hundreds of thousands of lives, and counting (from fossil air pollution deaths).
Just looking at numbers, we find that nuclear is ridiculously safe. The perception is way different though.
[1] https://en.wikipedia.org/wiki/Banqiao_Dam#1975_Banqiao_Dam_f...
[2] https://www.who.int/airpollution/en/