I've visited Chernobyl myself twice now. Fantastic both times. Climbed most of the way up Duga 3 and also up onto the roof of Reactor 5.
If you want detailed info let me know. I currently do some work for a company that runs tours into the exclusion zone (we put together the Top gear special). Not sure if that violates forum rules! Mods let me know if this counts as advertising or anything.
Read all your blogs a while back. North korea one was very very good!