TEPCO has a 2nd to last ditch option at reducing nuclear criticality at Fukushima, namely the direct injection of Boron into the ground water. For more information see:
Boron Injection Wells Into Fukushima Ground Water and Nuclear PLINKO
However, since TEPCO has made a face saving claim that there is no recriticality because Boron water poured into the reactor is having no affect, there likely is resistance to taking further measures (not to mention the expense)
We at POTRBLOG believe the data indicates that the corium is in the ground water and is in an on-and-off again recriticality, with each cycle having a yet unquantified likelihood of an uncontrolled explosive recriticality.
Boron water poured in from the surface becomes too diluted from ground water, when and if it reaches the corium, to moderate the criticality. The coruim is actually self moderating via the production of Iodine-133 ~ Xenon-133. Depending on ground water conditions, the cycle jumps between the production of Neptunium,Plutonium and Iodine,Xenon.
In that light, the sole purpose of the Boron water being pumped into the reactors was to have a smooth thermal transition as the corium left the site and entered the ground water, there by delaying a violent "China Syndrome" type event.
However, much like the Federal Reserve's printing of money, it only makes matter worse long term. In both cases (the FED and TEPCO) it is the equivalent of giving a drug addict more and more of a drug at greater and great doses in hopes that it will somehow hold off the inevitable crash.
We at POTRBLOG believe the data indicates that TEPCO- as all of its "remedies" now have little to now affect- is no longer in control of the situation. The situation is in the hands of the ground water.
Assuming no explosive recriticality between now and winter, the snow and frost cover conditions at the Fukushima site will give away the severe nature of the condition in much the same way as the 10/24/11 Northern Lights in the Southern United States gave away the quantity of fallout in the skies above.
For more information on the current recriticality cycling at Fukushima please watch this video.
For more information about the last option (sans turning a blind eye) read post;
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