[Translate] Unit 1 Group Findings Earthquake And Corium Issues: We found an ongoing trend where significant earthquakes of 6.0 or higher that occurred near Fukushima Daiichi caused significant changes in unit 1. On July 31, 2011 there was a 6.4 earthquake. The radiation readings at Drywell B in unit 1 had been below 300 sV/h until the earthquake. After the earthquake radiation readings jumped to 356 sV/h. A 56 sV/h or greater jump. The August 17, 2011 6.2 earthquake saw a 57 sV/h increase. Drywell B sensor spiked from 359(Sv/h) on August 15th to 416 (Sv/h) on August 17 after the quake. The increased radiation continued for about half a day before dropping back under the 400 sV/h range. Another earthquake on August 19, 2011 caused a 17 sV/h jump in Drywell B radiation. From 416 sV/h before the quake to … Read entire article »

[Translate] Group Findings Unit 3 Ex-vessel steam explosion: Information gathered from the unit 3 explosion and events before and after the explosion event indicate a probable ex-vessel steam explosion and secondary hydrogen explosions occurred at unit 3. There are indications that sea water being injected into unit 3 may have flowed into the containment drywell rather than into the reactor vessel. This would have flooded the drywell, setting up the conditions that could cause an ex-vessel steam explosion as melted fuel fell down into the water. The explosion at unit 3 appears to have two distinct components, “the fiery plume shaped like a fist that punches out through the top of the south sunlit wall.they blasted out along roughly 45˚ angles” and the mushroom cloud of fuel-dirtied steam. TEPCO’s assumption has been that the entire … Read entire article »