The purpose of nitrogen injection to reactor1 is “to confirm the impact of the radiolysis of water inside the PCV”
On 2/25/2013, Fukushima Diary reported Tepco was going to restart the nitrogen gas injection into PCV of reactor1. [URL 1]
On 2/26/2013, Tepco reported the purpose is to confirm the impact of the radiolysis of water inside of suppression chamber.
From what they briefly reported, it is not clear what they are trying to confirm but they have been insisting the hydrogen gas retained in PCV is from the early stage of the accident. Because it is not supposed to increase, they only needed to push it out by injecting nitrogen gas. However, if they meant “hydrogen gas is still constantly produced from radiolysis of water”, it is admitted that water is still exposed to radiation in suppression chamber and Tepco needs the means to reduce hydrogen concentration until decommissioning.
If the density of hydrogen has goes over 2%, there is a possibility of hydrogen gas explosion.
Le 26 février 2013, Tepco rapporte que Le but est de confirmer les impacts des radiolyses de l’eau dans la salle en surpression.
De ce qu’ils ont brièvement rapporté, ce qu’ils essayent de confirmer n’est pas clair mais ils insistent sur le fait que l’hydrogène encore retenu dans la PCV provient du tout début de l’accident. Ils ont seulement besoin de le pousser dehors en injectant de l’azote parce qu’il n’est pas supposé être en augmentation. Toutefois, s’ils veulent dire que “l’hydrogène gazeux est toujours produit de façon constante à partir de la radiolyse de l’eau”, c’est admettre que l’eau est toujours exposée à une forte radioactivité dans la chambre de surpression et que Tepco doit trouver le moyen de réduire la concentration en hydrogène jusqu’au démantèlement.
Si la concentration en hydrogène dépasse les 2 %, alors le risque d’explosion de l’hydrogène gazeux est réel.
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.