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View Diary: Losing the Pacific Ocean (162 comments)

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  •  The coriums cannot reach (6+ / 0-)

    critical mass or they'd have done so within the first week. Now they are diluted by the assorted non-fuel metals, concrete and whatever else they've melted into their masses to reach critical mass. They are by now very likely unable to actively melt whatever they're in contact with, even if it's still more than a thousand degrees. It may not be technically solid, it is most certainly still plenty nasty, but if it's not maintaining a temperature hot enough to melt concrete or rock on contact, it's not on the move.

    The nitrogen injection was done in hopes that if the corium hit groundwater it would not cause an explosive hydrogen-oxygen atmosphere from intense radiolysis. They are now, per best guesses of a host of respectable 'experts' (including those at GE, which is co-owner of Daichi and designed these plants) sitting in water. The danger of more hydrogen explosions has passed, which is why they stopped injecting nitrogen. Caveat: Unit-3 is has been steaming for weeks now, its corium may be still on the move, probably much hotter than 1 and 2's flows. That was the MOX reactor, plutonium fuel.

    The earth is pretty darned good shielding for these puppies. The issue is the water, and the crap it's picking up from the corium on its way to the sea. I have given my best opinion (at this time) about how they could mitigate that to a far greater degree than doing nothing. It doesn't look like anybody's willing to do what is necessary. That's a shame.

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