Top > Releases ･ Announcements > Fukushima Daiichi NPS Prompt Report > 2013 > Water Leakage Found around Units 5-6 Low Level Radioactive Accumulated Water Tank at Fukushima Daiichi Nuclear Power Station (Follow-up Information)
This is follow-up information regarding the water leakage from the Units 5-6 RO treated water tank (D7) at Fukushima Daiichi Nuclear Power Station.
As a result of site inspection, the leakage area was found to be about 3m x about 20m. The leakage amount is estimated to be 27.5 m3 based on the water levels of the D7 tank up to yesterday and the transfer amount of treated water.
Although the leaked treated water has been absorbed into the ground, we consider that the leaked water will not flow into the sea because there are no side ditches near the location of the leakage, and because the source of the leakage is more than 100 m away from the sea.
The treated water leakage was caused by overflow from the D7 tank, which is attributed to a failure to perform an operation to switch tanks from the D7 tank to the D8 tank, among eight treated water tanks (D1-D8) in total, while this operation was to be performed yesterday.
The sampling results obtained yesterday for treated water having overflowed from the D7 tank are below the detection limits. However, sampling of the water will be performed again to ensure safety.
Information previously announced today has been corrected as follows:
(Incorrect) "a TEPCO employee on patrol found"
(Correct) "a TEPCO employee preparing for yard watering found"
© Tokyo Electric Power Company Holdings, Inc.
