Category Archives: plant damage

17,000 tons of groundwater leaked into #5 and #6 now sprayed around the site

Slightly-radioactive groundwater from the basements of the undamaged #5 and #6 reactors is now being sprayed around the site to evaporate (at about 1 litre per sq metre) after the 17,000 ton storage tanks filled up.  Note that if groundwater … Continue reading

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Damage to #6 intake canal and water in basement from cracks – photos

Under the title Current status of Fukushima Daiichi in photos, TEPCO released a lot of photos of Units 5 and 6. This is spin and unrepresentative of the status of the plant of course, because these units were not operational at … Continue reading

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Measure hydrogen in containment vessels, TEPCO is told

Efforts shall be made to measure the hydrogen concentration in the PCV of Units 1-3, NISA told TEPCO on Sept 25.   After three hydrogen explosions, it seems hard to believe that TEPCO has not measured this before.    

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Quake damage found in Tokai nuclear power station

Quake damage to turbine blades found at Tokai Damage to turbine blades, apparently caused by the March 11th earthquake, has been found at a nuclear power plant in Ibaraki Prefecture, eastern Japan.
The Tokai Daini plant, about 100 kilometers north of … Continue reading

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Putting generators in flood proof buildings was a “no-brainer” – TEPCO engineer

“Backup power generators are critical safety equipment, and it should’ve been a no-brainer to put them inside the reactor buildings,” Mr. Toyota says. “It’s a huge disappointment that nobody at Tepco—including me—was sensitive enough to notice and do something about … Continue reading

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Hose rip interrupts cooling of reactor #5 for 3.5 hours -22 hours before another meltdown

Apparently, after another 22 hours the reactor would have boiled dry and a meltdown begun.  Pumps in the Residual Heat Removal System, which  cools both the #5 reactor and the spent fuel pond, also broke down on May 28 for … Continue reading

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34000 tons of water will be decontaminated in next 3 months – TEPCO

TEPCO added that there is now about 120,000 tons of highly-contaminated water the plant. Although there have been several stoppages of the new US-French-Japanese system since it was due to start on June 15, TEPCO seems confident such teething problems … Continue reading

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SNF pool analysis – nuclide density

Spent nuclear fuel pool analysis at #1:  June 24 I-131: 68   Bq/cm3 Cs-134: 12,000 Bq/cm3 Cs-137: 14,000. http://www.tepco.co.jp/en/nu/fukushima-np/images/handouts_110624_02-e.pdf

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Explosion at #4 may have saved SNF pool from meltdown and disaster: TEPCO

Accidental water flow into pool may have prevented fuel melting: TEPCO Tokyo Electric Power Co. (TEPCO) has released the results of an investigation into developments surrounding the No. 4 reactor at the Fukushima No. 1 Nuclear Power Plant and advised … Continue reading

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Nuclear plant safety standards may be thrown out

failed standards:   quake was 25% over max expected, despite 60% increase in 2006;  meltdown never expected;  radiation release is 100 times max expected;  10km  max evacuation zone was expected;  external power and backups would not both fail; Nuclear plant … Continue reading

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