11 tank area dams overflowed due to the heavy rain / Radioactive density exceeded safety level in 6 of them

Even after the previous Typhoon, it rained heavily in Fukushima plant area on 10/20/2013.

Tepco estimated it would be 30mm ~ 40mm / day but the actual amount of rainfall was 30 mm / hour at the maximum.

Having rainwater retained in the tank area dams already because of the previous Typhoon, the rain of 10/20 increased the retained water faster than pumped up and 11 tank area dams overflowed. Among these 11 tank area dams, radioactive density (Cs-134/137, Sr-90) was over the safety limit in 6 dams.

The highest reading of all β nuclides (including Strontium-90) was 710,000 Bq/m3 according to Tepco.


Additionally, Tepco discharged the retained “rainwater” of 3 more tank area dams. They claim the radioactive density was lower than the safety limit.








Couldn’t make time to get the Donation button back on by 10/14/2013. It should be reposted NEXT MONDAY. I will try.


Français :

Sous l’effet des fortes pluies, 11 endiguements de citernes ont débordé / La radioactivité dépasse la limite de sécurité pour 6 d’entre eux


Même après le dernier typhon, ce 20 octobre 2013 il y a eu de fortes pluies sur la région de la centrale de Fukushima.

Tepco estime qu’il doity avoir eu entre 30 et 40 mm / jour mais que la quantité horaire maximale réelle a été de 30 mm.
Les pluies du 20 octobre ont fait monter les eaux retenues plus vite que ce qui en était pompé à cause du volume d’eaux retenues à l’issue du dernier typhon et 11 endiguements de zones de citernes ont débordé. Sur ces 11 endiguements, la radioactivité en césium (Cs 134/137) et strontium (Sr 90) était au-dessus de la limite de sécurité pour 6 endiguements.
Le record pour la radioactivité β (dont le strontium 90) est de 710 000 Bq/m³, selon Tepco.

De plus, Tepco a déversé les “eaux de pluie” retenues de 3 autres endiguements de citernes. Ils affirment que leur radioactivité est inférieure à la limite de sécurité.


Pas eu le temps de remettre les boutons sur les dons pour le 14 octobre. Ils devraient être de retour LUNDI PROCHAIN. Je vais essayer.

About this site

This website updates the latest news about the Fukushima nuclear plant and also archives the past news from 2011. Because it's always updated and added live, articles, categories and the tags are not necessarily fitted in the latest format.
I am the writer of this website. About page remains in 2014. This is because my memory about 311 was clearer than now, 2023, and I think it can have a historical value. Now I'm living in Romania with 3 cats as an independent data scientist.
Actually, nothing has progressed in the plant since 2011. We still don't even know what is going on inside. They must keep cooling the crippled reactors by water, but additionally groundwater keeps flowing into the reactor buildings from the broken parts. This is why highly contaminated water is always produced more than it can circulate. Tepco is planning to officially discharge this water to the Pacific but Tritium is still remaining in it. They dilute this with seawater so that it is legally safe, but scientifically the same amount of radioactive tritium is contained. They say it is safe to discharge, but none of them have drunk it.


October 2013