The sea-side impermeable wall is an underground wall constructed (from April 2012) along the coastline to hold back groundwater flowing from the premises alongside Units 1 to 4 into the port area at Fukushima Daiichi Nuclear Power Station and also to further prevent contamination of seawater. Construction of the sea-side impermeable wall was completed on October 26, 2015.
Construction of the wall consisted of driving 594 steel pipe sheet piles into the earth across a width of about 780 meters. The construction of this wall has drastically reduced the risk of contaminated water flowing into the ocean when performing mid-and-long-term decommissioning measures even if there is some accident resulting in the leakage of contaminated water. Additionally, the completion of the sea-side impermeable wall is a sign of major progress in implementing our contaminated water treatment measures.
We will continue to carefully monitor conditions in the port area.

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