TEPCO recovered a total of 27 cubic meters of water-soaked soil. The radiation level on the soil surface, which was 19 millisieverts per hour when recovery began, has fallen below the pre-work level of 0.02 millisIEverts.

TEPCo is investigating the cause of the accident, and the Nuclear Regulation Authority will hear details at its meeting on the 19th next week. It appears that the worker may have forgotten to close a valve that is manually opened and closed.