Top > Releases ･ Announcements > Fukushima Daiichi NPS Prompt Report > 2013 > Water Leak from the Underground Reservoirs in Fukushima Daiichi Nuclear Power Station (Follow-up Information No.41)
This is follow-up information (update) regarding the water leak from the underground reservoirs at Fukushima Daiichi NPS.
As for the leakage from the connection part (flange) of the transfer pump outlet pipe, the pipe flange was disassembled for cause investigation. Since the cause of the leakage was identified to be the problem with the flange connection part* as a result of investigation, the flange has been recovered by replacing the packing.
*Inhomogeneous amount of gap between the flange surfaces.
The soil covering the upper part of the reservoir (embankment) where the leaked water is assumed to have been absorbed was removed. The survey results of the covering soil (embankment) after removing the contaminated portion was 28mSv/h (β+γ) (max.) on the ground surface.
The portion of the soil subject to further removal is to be considered.
© Tokyo Electric Power Company Holdings, Inc.
