Not directly, and if it’s all the same with you, I would rather that we not open up the containment vessel to take a look either. We can take educated guesses based on what is going on outside though. Think of it as the difference between listening to a heartbeat with a stethoscope and ripping a person’s chest open (with attendant blood loss) to watch the heart beat with your own eyes.
Most of what I’ve seen says it was a hydrogen explosion outside of the containment vessel. They are venting hydrogen, but the systems that are supposed to ignite it safely before it gets to the point where it could make a Hindenburg-style explosion rely on electricity, so there was a lot of hydrogen in the building when it went up.
I take the evacuation radii with a grain of salt. Having grown up near a nuclear plant, I know that they tend to be over-cautious to the point of paranoia. Probably not a bad idea considering the stakes. Given how tough the containment vessels are, I am not terribly worried. Concerned? Definitely! But not worried.
@flutherother Considering the magnitude of the quake and how well the plants held up despite that, I am not so sure. I wonder how Hoover Dam would fare against an 8.9 quake and a couple of >6.0 aftershocks.