Chornobyl had an explosion because of a fire
but not a nuclear explosion
non the less radiation pollution was so bad
that Germany stopped their nuclear electric power program
and many people in Ukraine and Belarus got cancer
I kept kids from Belarus here during the summer for 7 years so that they could get medical checkups and have a fun summer. If you want to see Ukraine decay due to Chernobyl checkout http://www.kiddofspeed.com