Monkey, thanks for the link.
Maybe this explains the Fukishima aftermath. There was a proclimation of "fission reactions are occurring" several months ago. There was a video on the net that showed flashes of light within the building, which you could see from the camera from a distance. You could see the flash on the clouds behind the building, also. It was gone in a flash. Perhaps this was something inbetween decay and explosion, a semi-sustained reaction that fizzled out(?)...
I did wonder when it melted down if there could be an explosion because the fuel's so hot. Guess it's more or less the hydrogen explosions that occur and maybe this flash phenomenon.
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