Tepco to start nitrogen gas injection into reactor2 for the first time, “Not knowing the hydrogen gas concentration”

Tepco is going to inject nitrogen gas into reactor2 suppression chamber as a test.

They need to keep the hydrogen gas concentration lower than 2% or it may cause hydrogen explosion.

Tepco has been injecting nitrogen gas into reactor1 to purge hydrogen gas but they couldn’t inject it into reactor2 suppression chamber so far.

However, they don’t actually know the hydrogen gas concentration in suppression chamber of reactor2.

In order to obtain data, they will inject nitrogen gas at 5Nm3/h, for 6 hours a day from 5/14 to 5/17/2013.

The nitrogen gas will be injected in the day time. In case of hydrogen gas concentration going over 2% in Dry Well of PCV, entering reactor2 building will be restricted.





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Français :

Tepco va pour la première fois injecter de l’azote dans le réacteur 2. “On ne sait pas quelle est la concentration de l’hydrogène”


Tepco va injecter de l’azote gazeux dans le réacteur 2 en tant que test.
Ils doivent maintenir la concentration de l’hydrogène en dessous de 2 % pour parer au risque de son explosion.
Tepco avait injecté de l’azote dans le réacteur 1 pour en purger l’hydrogène mais ils ne pouvaient pas le faire dans le réacteur 2 jusque-là.
Ils vont injecter l’azote dans la chambre en surpression du réacteur 2. Ils ne connaissent pas toutefois la concentration en hydrogène dans cette chambre en surpression du réacteur 2.
Pour le savoir, ils vont injecter de l’azote à 5 Nm³/h pendant 6 heures par jour entre le 14 et le 17 mai 2013.
L’azote sera injecté de jour. Si la concentration d’hydrogène dépasse les 2 % dans l’enceinte sèche de la PCV, l’entrée dans le bâtiment du réacteur 2 sera restreinte.


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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.


May 2013