According to Ken'ichi Kunisawa, (see linked article), the TEPCO workers and troops near the hot zone are putting their lives at risk to do what they can to get the situation under control. Having some outside group get in there uninvited, some outside group that's new to the situation would just add to the CF that seems to be going on. The folks I'd want to speak with were it my decision would be the firefighters and other personnel who worked the Chernobyl incident back in the 1980s. They've been there and done that.