13,440,000 Bq of Cs-134/137 found leaking in Reactor 4 building / Tepco “This is not contaminated water”

1.2 t of contaminated water found leaking in Reactor 4 building, according to Tepco.

A leakage detector went off at 11:19 of 2/27/2015, however a Tepco employee couldn’t find the leakage until it went off for the second time 30 minutes after the first alert.

When it was found, it already spread in the area of 20m × 6m × 1cm.

From the sample of leaked water, they detected 11,200,000 Bq/m3 of Cs-134/137. Other nuclide density is not announced for some reason.

In total, 13,440,000 Bq of Cs-134/137 leaked out. However Tepco is insisting it is not contaminated water.

The source of the water has’t been identified.







Français :

13 440 000 Bq de césium 134/137 fuient du réacteur 4 / Tepco : “Ce n’est pas de l’eau contaminée”


Selon Tepco, ils ont trouvé 1,2 T d’eau extrêmement radioactive fuyant du bâtiment du réacteur 4.

Un détecteur de fuite s’était déclenché le 27 février 2015 à 11:19, néanmoins l’employé de Tepco n’a pas pu trouver la fuite jusqu’à ce qu’il se déclenche une seconde fois 30 minutes après la première alerte.
Lorsqu’ils l’ont trouvée, elle s’étendait déjà sur une surface de 20 × 6 m et sur 1 cm d’épaisseur.
Ils ont relevé 11,2 millions de Bq/m³ de Cs 134/137 dans un échantillon de cette eau. La radioactivité des autres nucléides n’est pas communiquée.
Au total, 13 440 000 Bq de Cs 134/137 ont fuit. Néanmoins, Tepco insiste à dire que ce n’est pas de l’eau contaminée.
L’origine de la fuite n’a pas été trouvée.


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.


February 2015