Retained water underground temperature went up by 10℃ near Reactor 2 / Tepco “Still investigating the cause”

Following up this article.. Tepco to give up the preceding frozen wall and directly fill the trenches with cement instead [URL]


The retained water temperature went up by 10℃ on 10/29/2014 near Reactor 2. Any following data has not been announced by 11/3/2014.

Tepco had been trying to fill the underground trench with cement and grout from 10/20 to 10/29/2014.

After they injected the plastic grout material on 10/29/2014, one of the thermometers showed rapid increase in water temperature.

The thermometer is located in the upper part of the trench, where is not filled by cement yet. It was approx. -15℃ but went up to -5℃ within 24 hours.

Other thermometers are not showing large increase in temperature.


Coolant water that touched molten fuel is likely to be flowing where the issued thermometer is set. It is not known why retained water is being heated.

Tepco states they are still investigating the cause.




Français :

La température des eaux souterraines retenues près du réacteur 2 est montée de 10℃ / Tepco : “On cherche encore pourquoi”


Article lié : Tepco abandonne le mur congelé et, à la place, va combler les tranchées avec du ciment

La température des eaux souterraines retenues près du réacteur 2 est montée de 10 ℃ le 29 octobre 2014. Au 3 novembre 2014, aucune donnée précise n’a été communiquée.

Tepco a essayé de combler la tranchée souterraine avec du ciment et de coulis entre le 20 et le 29 octobre 2014.
Un des thermomètres a montré une rapide montée de la température de l’eau après avoir injecté du coulis plastifié le 29 octobre 2014.
Ce thermomètre est situé dans la partie supérieure de la tranchée qui n’est pas encore comblé au ciment. On était à environ -15℃ mais elle est passée à -5℃ en 24 heures.
Les autres thermomètres ne présentent pas une telle augmentation de température.

Le liquide de refroidissement qui est passé au contact du combustible fondu a l’air de s’écouler là où se trouve ce thermomètre. On ne sait pas pourquoi ces eaux retenues chauffent.
Tepco affirme qu’ils sont toujours en train d’en chercher la raison.

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.


November 2014