Information regarding contaminated water leakage at TEPCO’s Fukushima Daiichi Nuclear Power Station
August 27, 2013
1. On June 19, 2013, TEPCO announced that ground water in the area between the turbine buildings and plant port in Fukushima Daiichi NPS had been contaminated with radioactive materials. Furthermore, TEPCO announced that a part of this contaminated ground water leaks to the near plant zone of the plant port, the area between the seawall and the secondary breakwater on July 22.
Total beta (excluding tritium) activity in the sea water was only detected in the near plant zone while total beta activity in other points of the plant port and open sea was below detection limit or similar. TEPCO took immediate countermeasures and planned fundamental countermeasures to be implemented within one to two years. The Government of Japan expressed that it would provide proactive support to facilitate TEPCO’s activities.
2. On August 19, TEPCO announced that they found water leak from a drain valve of a tank dike in the H4 area(Note) which is one of the installation locations of contaminated water tanks in Fukushima Daiichi NPS.
TEPCO estimates that the amount of the leaked contaminated water was 300 m3. In cooperation with the Government of Japan, TEPCO is making efforts for investigating the cause of this issue and preventing the similar events.
Note:The H4 tank area is located about 500m away from the sea.
Detailed information is explained in “Fact sheet: overview of contaminated ground water leakage at TEPCO’s Fukushima Daiichi NPS” announced by the Agency for Natural Resources and Energy, METI:
Related information will be updated on the following websites: