Underground wall nearly doubled the increasing speed of retained water in plant buildings

Following up this article.. Increasing groundwater is “bulging” the coastal area of Fukushima plant after building underground wall [URL]

 

On 12/18/2015, Tepco reported to NRA (Nuclear Regulation Authority) that the underground wall ended up accelerating increasing speed of the groundwater retained in the plant buildings.

The seaside underground wall was expected to stop the contaminated groundwater flowing to the sea. However, the volume of groundwater stopped by the wall was larger than estimated and it contains seawater, which cannot be processed by the purification system.

Originally, Tepco planned to pump up the groundwater before the wall to discharge to the sea after purification. However Tepco is actually having to send it back to the plant buildings due to the problems above.

The volume of water sent back to the building is reportedly 400 t / day.

400 t / day of groundwater was supposed to flow into the plant buildings, so now double amount of the groundwater is flowing to the plant buildings. Because the newly added water contains seawater, it will also accelerate the deteriorating speed of the plant facility.

 

Tepco comments they managed to reduce the volume of groundwater flowing to the plant buildings by 200 t / day by operating “sub-drain”. Either way, the bigger volume of groundwater is flowing to the plant buildings than before building the seaside underground wall.

 

https://www.nsr.go.jp/data/000133831.pdf

https://www.nsr.go.jp/disclosure/committee/yuushikisya/tokutei_kanshi/00000014.html

 

 

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Français :

Le mur souterrain a presque doublé le débit des eaux entrant dans les bâtiments

Article lié : Après construction du mur souterrain, la montée des eaux souterraines fait “gonfler” le rivage de la centrale de Fukushima

 

Le 18 décembre 2015, Tepco a informé la NRA (Nuclear Regulation Authority) que le mur souterrain à la mer a pour conséquence d’augmenter le débit des eaux souterraines entrant dans les bâtiments de la centrale.

Ce mur souterrain devait empêcher les eaux souterraines radioactives de partir en mer mais le volume retenu s’avère plus grand que celui prévu et il contient de l’eau de mer qui ne peut être traitée par les systèmes de purification.

Au départ, Tepco prévoyait de pomper les eaux devant le mur pour ensuite les traiter et les déverser en mer. De fait et à cause de ce qui précède, Tepco est obligé de les ramener dans les bâtiments de la centrale.
Ce volume d’eau supplémentaire incorporé aux bâtiments est dit être de 400 t/jour. À présent on y a donc le double puisqu’il était déjà supposé s’écouler 400 t/jour dans les bâtiments avant le mur. La vitesse de dégradation des appareillages de la centrale va également en augmenter puisque ces eaux ajoutées contiennent de l’eau de mer.

Tepco affirme qu’en mettant en place une “sous-évacuation” ils ont réussi à les réduire de 200 t / jour. De toute façon le volume inondant les bâtiments est à présent plus grand qu’avant la construction du mur souterrain à la mer et il est salé.

https://www.nsr.go.jp/data/000133831.pdf
https://www.nsr.go.jp/disclosure/committee/yuushikisya/tokutei_kanshi/00000014.html

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.

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