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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