12/18/2011, Tepco announced 230 tons of contaminated water leaked from the pool for highly contaminated water. It was in an underground tunnel.
It contains 5,400 Bq/cm3 of Cs-137, 3.0 mSv/h on its surface. It is not cleared how it leaked from the pool.
Asahi newspaper says “It’s ONLY 1% contamination of the highly contaminated water.”
According to Tepco, the tunnel is for cables, 4.5m wide and 54m long. The depth of contaminated water was from 50cm ~ 3,400cm. It was found by Tepco staff about 10AM 12/18/2011.
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.