[Mystery] Upper parts are more contaminated on the first floor of reactor2

Tepco is going to investigate the first floor of reactor2 on 6/18/2013.

By using 3 robots, they are to research the radiation level and intervention of the upper part of the 1st floor.

According to Tepco, they can decrease the atmospheric dose more efficiently by shielding the equipment of the upper part of the floor but the reason is not announced.

In order to measure the radiation level of the upper part, Tepco is going to introduce the new robot developed by Honda and National Institute of Advanced Industrial Science and Technology, which can reach 7m height.

However, it cannot step up over 6cm and moves at 2km/h. Because it weighs 1.1 tones, 7 human workers will go to the investigation area to support the robots.

They are going to investigate with the robots only in the west part of the floor this time. From Tepco’s report, the highest radiation level is 36 mSv/h but it was measured in the lower part of the floor, where the radiation level is relatively low as Tepco reported.






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Français :

[Mystère] Les niveaux supérieurs du réacteur 2 sont plus contaminés que son premier étage


Tepco va explorer le premier étage du réacteur 2 le 18 juin 2013.

Ils vont rechercher les niveaux de radioactivité et faire quelques interventions dans la partie supérieure du 1er étage.
Selon Tepco, ils peuvent diminuer plus efficacement la dose ambiante en protégeant les appareils de la partie supérieure de l’étage mais la raison n’en est pas communiquée.
Pour relever le niveau de radioactivité de la partie supérieure, Tepco va y introduire le nouveau robot développé par Honda et le National Institute of Advanced Industrial Science and Technology, et qui peut atteindre 7 m de haut.
Il ne peut cependant pas passer une marche de plus de 6 cm et se déplace à 2 km/h. 7 travailleurs humains vont l’accompagner pendant l’exploration pour l’aider parce qu’il pèse 1,1 tonne.
Cette fois-ci, ils vont seulement explorer la partie ouest de l’étage avec les robots. Selon le rapport de Tepco, le record de radioactivité est à 36 mSv/h mais il avait été relevé dans la partie basse de l’étage où, selon Tepco, la radioactivité est relativement plus faible.


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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.


June 2013