That was a bad link, those are just photos of the outside, where it was perfectly fine to visit if you avoided standing downwind. In fact, they apparently overflew it just two days later and took this footage: https://www.youtube.com/watch?v=yoJTNC-3XLA

They've tried to put drones into Fukushima, attempts so far have been unproductive one way trips. Not all of that is the radiation killing stuff, apparently the geometry to be navigated has some pretty narrow passages as well.