Scientists: 'Big One' Building Beneath Fukushima [View all]

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Wed Feb 15, 2012 at 12:28 PM PST
Scientists: 'Big One' Building Beneath Fukushima
by JoieauFollow

Last week the temperature in Fukushima Daiichi's #2 reactor vessel - as measured at the "0" position gage - began rising in an erratic manner. Over the weekend the gage shot over 80ºC, causing TEPCO to have to report that if the reading is accurate, the #2 reactor can no longer be considered to be in a state of "cold shutdown..."

SNIP

...Today the "0" level gage at unit-2 is still hovering around 250ºC, after having gone as high as 275.9ºC on Monday. TEPCO has been issuing reassuring statements that they 'think' the gage is broken because two other temperature gages in the vessel aren't reading that high, although at least one of them has behaved as irregularly as the "0" gage has. TEPCO employees at the site say they doubt the gage is actually broken, and have increased the water being added to the vessel as well as injected boron to help prevent criticality. Analysts have suggested that recent changes in the coolant flow due to changes made when the endoscopy was done may have affected the amount of water reaching the molten corium (wherever it may be), causing it to crack or shift, thus possibly going critical again for short periods to cause the temperature rise. Also over the weekend [Feb. 11 & 12] cesium levels measured around unit 2 jumped from single digits to 98.2 MBq/km2 for Cesium 134 and 139 MBq/km2 for Cesium 137.

SNIP

Some of us will recall the many reports during the fall of rising groundwater underneath the nuclear reservation, including boiling water and steam 'erupting' from the ground around units 1 and 2 through the extensive ground fissures and cracks that riddle the ground and widen with every 'aftershock' of the great earthquake that initiated the disaster nearly a year ago. In the last couple of days a new danger has reared its head with the release of a new study from the European Geosciences Union which issues the warning that the Fukushima Daiichi nuclear reservation is at increased risk of suffering a big earthquake epicentered essentially right underneath it, and that rising groundwater is an ominous sign that it could come very soon...

SNIP

...In the Iwaki area ~25 miles south of Fukushima Daiichi, where a magnitude 7 'aftershock' last April 11 occurred, Japan's seismic monitoring network recorded more than 24,000 tremors in the seven and a half months after March 11. There were a mere 1,300 quakes in the same area over the nine previous years. The research paper notes that Daiichi sits atop fractured crust with the same traits as Iwaki's, and that the fault under the plants can be weakened and "lubricated" by the same rising fluids. The conclusion of these geophysicist?

"Therefore, much attention should be paid to the FNPP (Fukushima Nuclear Power Plant) seismic safety in the near future..."

http://www.dailykos.com/story/2012/02/15/1065089/-Scientists-Big-One-Building-Beneath-Fukushima?via=siderec