TEPCO: 11m seawall completed at Fukushima plant
September 29, 2020
The operator of the damaged Fukushima Daiichi nuclear power plant says it has completed an 11-meter-high seawall to protect the facility from tsunami waves.
Tokyo Electric Power Company, or TEPCO, erected the barrier based on a government panel warning three years ago. It said that a mega-quake along the Chishima Trench, beneath the sea near northern Japan, could cause a tsunami to hit the compound.
TEPCO announced that a 1.7-meter-high concrete wall was built atop elevated ground stretching 600 meters on the sea side of the No.1 to No.4 reactors.
The firm says the barrier stands 11 meters above sea level and it was completed on Friday.
TEPCO next plans to build another seawall measuring up to 16 meters high, based on a new projection made by a government panel in April.
The projection says if a mega-quake were to occur along the Japan Trench off the northeastern coast, a tsunami could be higher than the newly-built seawalls.
TEPCO says it aims to complete the taller seawall by fiscal 2023.
16-meter seawall planned for Fukushima Daiichi
September 14, 2020
The operator of the damaged nuclear power plant in Fukushima, northeastern Japan, plans to build a taller seawall to help protect against future high seismic sea waves.
The move comes in response to the projection made in April by a government panel on the scale of tsunami that could be triggered by a massive quake along the Japan Trench in the deep sea off northeastern Japan.
The Tokyo Electric Power Company, or TEPCO, analyzed the projection and found that waves as high as 14.1 meters could engulf the Fukushima Daiichi plant compound, where the No.1 to No.4 reactors are located. It also found that waves of up to 15.3 meters high could hit south of the No. 4 reactor.
An 11-meter seawall is under construction on the ocean side of the plant compound. In an area south of the No. 4 reactor, another sea wall that is 12.8 meters high has already been completed.
TEPCO officials on Monday agreed to build another seawall measuring up to 16 meters high to protect these areas before the end of March 2023.
The wall is one of the anti-tsunami measures being taken by TEPCO as it decommissions the plant.
Work is under way to block the openings of the reactor buildings. Power supply vehicles are also deployed on higher ground to continue cooling spent nuclear fuel.
Nearly 1,000 tanks of radioactive wastewater are stored in the compound. TEPCO says the projected tsunami won’t reach the higher ground where these tanks are located.
Tsunami could overtake Fukushima Daiichi’s seawall
April 21, 2020
An estimate by a Japanese government panel suggests that tsunami could overwhelm a new seawall at the Fukushima Daiichi nuclear power plant, if a mega-quake occurs in a deep-sea trench off northeastern Japan.
The panel of experts on Tuesday released its projection of the scale of tsunami that could be triggered by a massive quake along the Japan Trench.
The panel expects that waves as high as 13.7 meters could hit Futaba Town, Fukushima Prefecture, where the plant is located.
That is higher than the 11-meter-high seawall being built on the ocean side of the compound. The wall is one of the anti-tsunami measures taken by Tokyo Electric Power Company as it decommissions the plant.
Other measures include blocking the openings of the reactor buildings and deploying power supply vehicles on higher ground to continue cooling spent nuclear fuel.
TEPCO says it will examine the estimate and consider what measures to take.
Nearly 1,000 tanks of radioactive wastewater are stored in the compound. The operator says the projected tsunami won’t reach the higher ground where they are located.
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