A thermometer of Reactor 2 indicates a rapid increase of temperature / From 20℃ to 70℃ within 6 hours

According to Tepco’s plant parameter, one of the thermometers in Reactor 2 is showing an abnormal increase of temperature.

The data is published every 6 hours.

The thermometer is located in dry well of primary containment vessel. It has been indicating 21℃ until 5AM of 4/3/2015, however it jumped up to 70℃ by 11AM of the same day. It kept on increasing and reached 88℃ by 5PM of 4/5/2015.

At 11AM of 4/7/2015, it is still 84℃.


From Tepco’s credibility review of thermometers, the issued thermometer is still supposed to be used for “reference”.

They observed an abnormal change in the indicated temperature, however they could not conclude it is out of order.








Français :

Un thermomètre du réacteur 2 indique une montée rapide de la température : de 20℃ à 70℃ en 6 heures


Selon les paramètres usine de Tepco, un des thermomètres du réacteur 2 indique une montée anormale de la température.

Les données sont publiées toutes les 6 heures.
Le thermomètre est situé dans l’enceinte sèche de l’enceinte de confinement primaire. Il a indiqué 21℃ jusqu’au 3 mars 2015 à 05:00 AM. Il est passé à 70℃ vers 11:00 ce même jour. Il a continué de monter et était à 88℃ le 5 mars 2015 vers 17:00.
Le 7 mars à 11:00 il est toujours à 84℃.

Selon le bilan de crédibilité des thermomètres de Tepco, ce thermomètre est toujours supposé être utilisé comme “référence”.
Ils ont vu le changement anormal dans les températures indiquées, cependant ils ne peuvent pas en conclure qu’il soit en panne.


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.


April 2015