Tepco decreased Nitrogen gas injection to reactor1 → (26 hours later) reactor temperature rose up by 8℃

For some reason, reactor1 gets heated up once Tepco stops nitrogen gas injection.

In order to purge hydrogen gas that may cause hydrogen gas explosion, Tepco is injecting nitrogen gas into reactor1.

However, it also causes radioactive material to leak out of the vessel, so Tepco decreased the nitrogen gas volume to inject to reactor1 RPV by 20% on 10/9/2013 as an attempt.

26 hours later, they observed the temperature rise by approx. 8℃. Having this increase, they increased the nitrogen gas volume to inject to PCV by 4%, but it’s still stably high.

Tepco announced they are not injecting liquid nitrogen as air-cooling, but the relationship between nitrogen gas injection and reactor temperature hasn’t been identified.




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Français :

Tepco réduit les injections d’azote dans le réacteur 1 → (26 heures + tard) la température du réacteur monte de 8 ℃


Le réacteur 1 chauffe dès que Tepco arrête d’y injecter de l’azote.

Pour purger l’hydrogène qui peut exploser, Tepco injecte de l’azote dans le réacteur 1.
Néanmoins, ça provoque aussi des fuites radioactives en dehors de l’enceinte, alors Tepco a diminué de 20% le volume d’azote injecté dans la RPV1 (= enceinte principale du réacteur 1) le 9 octobre 2013 en tant qu’essai.
Ils constatent que 26 heures plus tard la température est montée d’environ 8 ℃. Ils ont augmenté de 4% les injections d’azote dans la PCV (= enceinte de confinement primaire) mais ça reste stable et chaud.
Tepco déclare qu’ils ne vont pas injecter d’azote liquide pour refroidir. Le lien entre les injections d’azote gazeux et la température du réacteur n’est pas établi.


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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.


October 2013