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Monday, 1 August 2011

TEPCO to start work by year-end to block radiation water leak to sea

TEPCO to start work by year-end to block radiation water leak to sea

In this June 12, 2011 photo released on July 5, 2011 by Tokyo Electric Power Co., masked workers in protective outfits prepare to drop one of sliding concrete slabs into a slit of the upper part of the sluice screen for Unit 2 reactor at the tsunami-crippled Fukushima Dai-ichi nuclear power plant in Okuma, Fukushima Prefecture, northeastern Japan, in their effort to decrease the leak of radiation contaminated water to the ocean. (AP Photo/Tokyo Electric Power Co.)
In this June 12, 2011 photo released on July 5, 2011 by Tokyo Electric Power Co., masked workers in protective outfits prepare to drop one of sliding concrete slabs into a slit of the upper part of the sluice screen for Unit 2 reactor at the tsunami-crippled Fukushima Dai-ichi nuclear power plant in Okuma, Fukushima Prefecture, northeastern Japan, in their effort to decrease the leak of radiation contaminated water to the ocean. (AP Photo/Tokyo Electric Power Co.)
TOKYO (Kyodo) -- Tokyo Electric Power Co. said Monday it will start building by the year-end an 800-meter-long shield between the Nos. 1-4 nuclear reactors at its crippled Fukushima Daiichi power plant and the coastal line to prevent radiation-contaminated water from flowing into the sea.
The work to hammer the shield to a depth of 20 meters in the ground is expected to take some two years for completion, the utility said.
The company, known as TEPCO, plans to work out a basic design for the shield by the end of August.
The designing work was part of the "Step 2" or the second phase of work to bring the plant under control, slated for three to six months from mid-July. On July 19, however, TEPCO changed the schedule and decided to move the design work forward.
The company is also considering surrounding the four reactors with the shield in the end.
In this June 30, 2011 photo released on July 5, 2011 by Tokyo Electric Power Co., sliding concrete slabs, seen above orange floats, have been set in the upper part of a sluice screen for the Unit 2 reactor at the tsunami-crippled Fukushima No. 1 Nuclear Power Plant in Okuma, Fukushima Prefecture, as part of TEPCO's efforts to reduce the leak of radiation contaminated water to the ocean. (AP Photo/Tokyo Electric Power Co.)
In this June 30, 2011 photo released on July 5, 2011 by Tokyo Electric Power Co., sliding concrete slabs, seen above orange floats, have been set in the upper part of a sluice screen for the Unit 2 reactor at the tsunami-crippled Fukushima No. 1 Nuclear Power Plant in Okuma, Fukushima Prefecture, as part of TEPCO's efforts to reduce the leak of radiation contaminated water to the ocean. (AP Photo/Tokyo Electric Power Co.)
TEPCO also said radiation doses of as high as 10 sieverts per hour were detected outside the buildings for the Nos. 1 and 2 reactors.
The dosage, which was detected at the bottom of a principal exhaust pipe between the two reactors by three plant workers at about 2:30 p.m., may be larger than the measured amount as it exceeds the capacity of measuring equipment.
TEPCO will inspect causes of the high dosage, making the area off-limits.
(Mainichi Japan) August 2, 2011
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