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Top > Releases ・ Announcements > Fukushima Daiichi NPS Prompt Report > 2014 > Recent topics:ICE WALL CLARIFICATION - NO IMPACT ON ICE WALL CONSTRUCTION

Fukushima Daiichi NPS Prompt Report 2014

Fukushima Daiichi NPS Prompt Report (Jun 18,2014)Recent topics:ICE WALL CLARIFICATION - NO IMPACT ON ICE WALL CONSTRUCTION

Fukushima - June 18, 2014, TEPCO has started freezing the water at intersections of turbine buildings inside the trenches (tunnel) from April 28, 2014, which contain contaminated water at Fukushima Daiichi NPS. This operation is one of the first steps to remove contaminated water from the trenches which is a major mile stone for TEPCO's decommissioning at Fukushima Daiichi NPS.
On June 16, TEPCO has announced some difficulties that were encountered with an effort to freeze standing water inside the tunnel which TEPCO has been implemented countermeasures since early June. However, this has nothing to do with the "ice wall (Land-side impermeable wall with frozen soil)" which is constructed by freezing the soil surrounding pipes that carry circulating refrigerant. Unfortunately, there are some miss understandings as relating to the ice wall that is being built around the perimeter of the four reactor units for the purpose of blocking groundwater.

This freezing the standing water inside the trenches are entirely different from the ice wall, which the technology is used to freeze soil, creating a frozen wall - not really an "ice wall" but in fact a wall of frozen soil - was tested and demonstrated to be effective before construction on the wall began in May. Instead of freezing the soil, TEPCO has to freeze standing water inside the trenches.

The difficulties encountered in freezing the contaminated water does not in any way represent a "setback" in development of the "ice wall," for which construction is proceeding as planned.

TEPCO will continue the decommissioning operation and contaminated water management safely and diligently with a support and the knowledge gain from our domestic and other international partners.

The status and measures of removing contaminated water in trench

About TEPCO
Tokyo Electric Power Co., Inc. (TEPCO) is Japan's largest power company, supplying energy to the greater Kanto area, including Japan's two most populous cities, Tokyo and Yokohama. Its 35,000 employees are committed to providing safe, reliable power to its 28.8 million customers, diversifying energy resources to ensure sustainability, and contributing to economic growth while fully meeting its responsibilities after the Fukushima Daiichi accident.
TEPCO website: http://www.tepco.co.jp/en/index-e.html
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