This *may* be a world first.
Discounting the Gabon? Uranium Mine reactions,

Self criticism can be useful, I'm told.
Self criticality sounds a bit more risky.

I'm not aware of anything ever before having gone self  critical and
maintained that state stably spontaneously with no human involvement
whatsoever in any part of the process.

It's not 100%sure from the reports if i really has now, but they are
reporting that it appears to have.This may be a welcome attitude of
full disclosure and may be intended to cover them for worst case
outcome.

The implied worst case outcome sounds like a bit of a hole in the
Fukushima foreshore and no future need to work on decommissioning
Fukushima 1,2 and 3 reactors. And maybe no need to ever deal with
others there that that are so far undamaged.

Whether is / was actually "self critical" seems to be a case of
apparently / maybe.

What limits how critical such a reaction goes or may become would be
of interest. Especially, I imagine, if you were working on the site.


http://www.businessweek.com/news/2011-11-02/tepco-detects-nuclear-fission-a=
t-damaged-fukushima-station.html


Gabon natural nuclear "reactors"

  http://en.wikipedia.org/wiki/Natural_nuclear_fission_reactor



         Russell
--=20
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