TOKYO — The operator of Japan’s tsunami-crippled nuclear power plant said Tuesday that about 300 tons of highly radioactive water have leaked from one of the hundreds of storage tanks there — its worst leak yet from such a vessel.
Tokyo Electric Power Co. said the contaminated water leaked from a steel storage tank at the wrecked Fukushima Dai-ichi plant. TEPCO hasn’t figured out how or where the water leaked, but suspects it did so through a seam on the tank or a valve connected to a gutter around the tank.
TEPCO said that because the tank is about 100 metres (330 feet) from the coastline, the leak does not pose an immediate threat to the sea. But Hideka Morimoto, a spokesman for Japan’s nuclear watchdog, the Nuclear Regulation Authority, said water could reach the sea via a drain gutter.
Four other tanks of the same design have had similar leaks since last year. The incidents have shaken confidence in the reliability of hundreds of tanks that are crucial for storing what has been a never-ending flow of contaminated water.
“We are extremely concerned,” Morimoto told reporters. He urged TEPCO to quickly determine the cause of the leak and its possible effect on water management plans.
TEPCO spokesman Masayuki Ono said the leaked water seeped into the ground after largely escaping piles of sandbags added to a concrete barrier around the tank.
Workers were pumping out the puddle and the remaining water in the tank and will transfer it to other containers, in a desperate effort to prevent it from escaping into the sea ahead of heavy rain predicted later in the day around Fukushima. By Tuesday afternoon they had captured only about 4 tons of the 300, Ono said.
The water’s radiation level, measured about 50 centimetres (2 feet) above the puddle, is about 100 millisieverts per hour _ five times the annual exposure limit for plant workers, Ono said.
The plant suffered multiple meltdowns following Japan’s massive earthquake and tsunami in March 2011. Hundreds of tanks were built around the plant to store massive amounts of contaminated water coming from the three melted reactors, as well as underground water running into reactor and turbine basements.
Aside from the tanks, contaminated water that TEPCO has been unable to contain continues to enter the Pacific Ocean at a rate of hundreds of tons per day. Much of that is ground water that has mixed with untreated radioactive water at the plant.
The water that leaked from the tank had been partially treated, with cesium and salt removed, before being stored.
Ono said the latest leak was by far the worst from a steel tank in terms of volume. The previous four cases involved leakage of only up to 10 tons.
TEPCO says the tanks that have leaked used rubber seams and were intended to last about five years. Ono said TEPCO plans to build additional tanks with welded seams that are more watertight.
The massive amount of radioactive water is among the most pressing issues affecting the cleanup process, which is expected to take decades.
The contaminated water is recycled as reactor cooling water, but its volume grows by 400 tons a day because of underground water inflow. TEPCO plans to secure storage facilities capable of holding 800,000 tons more water by 2015.
To reduce leaks unrelated to the tanks, plant workers are using measures such as building chemical underground walls along the coastline, but they have made little improvement so far.
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JAPAN-DISASTER-ANNIVERSARY-TSUNAMI
A little boy prays for his relatives killed by the 2011 tsunami at a cemetery in Minamisoma in Fukushima prefecture on March 11, 2013. Japan on March 11 marked the second anniversary of a ferocious tsunami that claimed nearly 19,000 lives and sparked the worst nuclear accident in a generation. AFP PHOTO/ Yoshikazu TSUNO (Photo credit should read YOSHIKAZU TSUNO/AFP/Getty Images)
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Second Anniversary Of 2011 Earthquake And Tsunami
A man prays on a site destroyed by the Great East Japan Earthquake and Tsunami in Kesennuma, Miyagi Prefecture, Japan, on Sunday, March 10, 2013. Japan’s economy grew at an annualized 0.2 percent last quarter after shrinking 3.7 percent the three previous months, the worst since the 2011 earthquake, revised government data show. Photographer: Kiyoshi Ota/Bloomberg via Getty Images
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Second Anniversary Of 2011 Earthquake And Tsunami
A woman looks at a vessel swept inland by the tsunami following the Great East Japan Earthquake in Kesennuma, Miyagi Prefecture, Japan, on Sunday, March 10, 2013. Japan’s economy grew at an annualized 0.2 percent last quarter after shrinking 3.7 percent the three previous months, the worst since the 2011 earthquake, revised government data show. Photographer: Kiyoshi Ota/Bloomberg via Getty Images
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Second Anniversary Of 2011 Earthquake And Tsunami
A man takes a photograph of an area damaged by the tsunami following the Great East Japan Earthquake from a hill in Ishinomaki, Miyagi Prefecture, Japan, on Sunday, March 10, 2013. Japan’s economy grew at an annualized 0.2 percent last quarter after shrinking 3.7 percent the three previous months, the worst since the 2011 earthquake, revised government data show. Photographer: Kiyoshi Ota/Bloomberg via Getty Images
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Second Anniversary Of 2011 Earthquake And Tsunami
Tractors damaged by the tsunami following the Great East Japan Earthquake are stacked in a pile in Ishinomaki, Miyagi Prefecture, Japan, on Sunday, March 10, 2013. Japan’s economy grew at an annualized 0.2 percent last quarter after shrinking 3.7 percent the three previous months, the worst since the 2011 earthquake, revised government data show. Photographer: Kiyoshi Ota/Bloomberg via Getty Images
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Second Anniversary Of 2011 Earthquake And Tsunami
People walk along a street in an area damaged by the tsunami following the Great East Japan Earthquake in Ishinomaki, Miyagi Prefecture, Japan, on Sunday, March 10, 2013. Japan’s economy grew at an annualized 0.2 percent last quarter after shrinking 3.7 percent the three previous months, the worst since the 2011 earthquake, revised government data show. Photographer: Kiyoshi Ota/Bloomberg via Getty Images
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Second Anniversary Of 2011 Earthquake And Tsunami
Boats damaged by the tsunami following the Great East Japan Earthquake are stacked in a pile in Kesennuma, Miyagi Prefecture, Japan, on Sunday, March 10, 2013. Japan’s economy grew at an annualized 0.2 percent last quarter after shrinking 3.7 percent the three previous months, the worst since the 2011 earthquake, revised government data show. Photographer: Kiyoshi Ota/Bloomberg via Getty Images
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JAPAN-DISASTER-ANNIVERSARY-TSUNAMI
A woman prays for her relatives killed by the 2011 tsunami at a cemetery in Minamisoma in Fukushima prefecture on March 11, 2013. Japan on March 11 marked the second anniversary of a ferocious tsunami that claimed nearly 19,000 lives and sparked the worst nuclear accident in a generation. AFP PHOTO/ Yoshikazu TSUNO (Photo credit should read YOSHIKAZU TSUNO/AFP/Getty Images)
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JAPAN-DISASTER-ANNIVERSARY-TSUNAMI
A woman prays for relatives killed by the 2011 tsunami at a cemetery in Minamisoma in Fukushima prefecture on March 11, 2013. Japan on March 11 marked the second anniversary of a ferocious tsunami that claimed nearly 19,000 lives and sparked the worst nuclear accident in a generation. AFP PHOTO/ Yoshikazu TSUNO (Photo credit should read YOSHIKAZU TSUNO/AFP/Getty Images)
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CORRECTION-JAPAN-DISASTER-ANNIVERSARY-TSUNAMI
CORRECTION-DATELINE A man prays for tsunami victims in front of a Buddhist statue in the Arahama district in Sendai, Miyagi Prefecture on March 11, 2013, the second anniversary of the 2011 earthquake and tsunami disaster. Japan on March 11 marked the second anniversary of a ferocious tsunami that claimed nearly 19,000 lives and sparked the worst nuclear accident in a generation. AFP PHOTO / Toru YAMANAKA (Photo credit should read TORU YAMANAKA/AFP/Getty Images)
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CORRECTION-JAPAN-DISASTER-ANNIVERSARY-TSUNAMI
CORRECTION-DATELINE A woman prays for tsunami victims in front of a Buddhist statue recently built on the seashore in the Arahama district in Sendai, Miyagi Prefecture on March 11, 2013, the second anniversary of the 2011 earthquake and tsunami disaster. Japan on March 11 marked the second anniversary of a ferocious tsunami that claimed nearly 19,000 lives and sparked the worst nuclear accident in a generation. AFP PHOTO / Toru YAMANAKA (Photo credit should read TORU YAMANAKA/AFP/Getty Images)
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JAPAN-DISASTER-ANNIVERSARY-TSUNAMI
Flowers are offered for victims killed by the 2011 tsunami in Minamisoma in Fukushima prefecture on March 11, 2013. Japan on March 11 marked the second anniversary of a ferocious tsunami that claimed nearly 19,000 lives and sparked the worst nuclear accident in a generation. AFP PHOTO/ Yoshikazu TSUNO (Photo credit should read YOSHIKAZU TSUNO/AFP/Getty Images)
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JAPAN-DISASTER-ANNIVERSARY-TSUNAMI
A family prays for their relatives killed by the 2011 tsunami at a cemetery in Minamisoma in Fukushima prefecture on March 11, 2013. Japan on March 11 marked the second anniversary of a ferocious tsunami that claimed nearly 19,000 lives and sparked the worst nuclear accident in a generation. AFP PHOTO/ Yoshikazu TSUNO (Photo credit should read YOSHIKAZU TSUNO/AFP/Getty Images)
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JAPAN-DISASTER-ANNIVERSARY-TSUNAMI
A couple visits a cemetery to pray for victims killed by the 2011 tsunami in Minamisoma in Fukushima prefecture on March 11, 2013. Japan on March 11 marked the second anniversary of a ferocious tsunami that claimed nearly 19,000 lives and sparked the worst nuclear accident in a generation. AFP PHOTO/ Yoshikazu TSUNO (Photo credit should read YOSHIKAZU TSUNO/AFP/Getty Images)
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JAPAN-DISASTER-ANNIVERSARY-TSUNAMI
Buddhists pray for tsunami victims on the seashore in the Arahama district in Sendai, Miyagi Prefecture, on March 11, 2013, the second anniversary of the 2011 earthquake and tsunami disaster. Japan on March 11 marked the second anniversary of a ferocious tsunami that claimed nearly 19,000 lives and sparked the worst nuclear accident in a generation. AFP PHOTO / Toru YAMANAKA (Photo credit should read TORU YAMANAKA/AFP/Getty Images)
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JAPAN-DISASTER-ANNIVERSARY-TSUNAMI
Buddhists pray for tsunami victims on the seashore in the Arahama district in Sendai, Miyagi Prefecture, on March 11, 2013, the second anniversary of the 2011 earthquake and tsunami disaster. Japan on March 11 marked the second anniversary of a ferocious tsunami that claimed nearly 19,000 lives and sparked the worst nuclear accident in a generation. AFP PHOTO / Toru YAMANAKA (Photo credit should read TORU YAMANAKA/AFP/Getty Images)
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JAPAN-DISASTER-ANNIVERSARY-TSUNAMI
Buddhists pray for tsunami victims on the seashore in the Arahama district in Sendai, Miyagi Prefecture, on March 11, 2013, the second anniversary of the 2011 earthquake and tsunami disaster. Japan on March 11 marked the second anniversary of a ferocious tsunami that claimed nearly 19,000 lives and sparked the worst nuclear accident in a generation. AFP PHOTO / Toru YAMANAKA (Photo credit should read TORU YAMANAKA/AFP/G
etty Images) -
JAPAN-DISASTER-ANNIVERSARY-TSUNAMI
Police officers search for tsunami victims two years after at the estuary of the Kyu Kitakami river in Ishinomaki, Miyagi prefecture on March 11, 2013. Japan on March 11 marked the second anniversary of a ferocious tsunami that claimed the lives of 15,881 people, with 2,668 others remaining unaccounted for, and sparked the worst nuclear accident in a generation. AFP PHOTO / TOSHIFUMI KITAMURA (Photo credit should read TOSHIFUMI KITAMURA/AFP/Getty Images)
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JAPAN-DISASTER-ANNIVERSARY-TSUNAMI
Coast guard officers search tsunami victims at the estuary of Kyu Kitakami river in Ishinomaki city, Miyagi prefecture on March 11, 2013. March 11, 2013 marks the second anniversary of the 9.0 magnitude earthquake that sent a huge wall of water into the coast of the Tohoku region, splintering whole communities, ruining swathes of prime farmland and killing nearly 19,000 people. AFP PHOTO / TOSHIFUMI KITAMURA (Photo credit should read TOSHIFUMI KITAMURA/AFP/Getty Images)
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JAPAN-DISASTER-ANNIVERSARY-TSUNAMI
Police officers search for tsunami victims two years after, at the estuary of the Kyu Kitakami river in Ishinomaki, Miyagi prefecture on March 11, 2013. Japan on March 11 marked the second anniversary of a ferocious tsunami that claimed the lives of 15,881 people, with 2,668 others remaining unaccounted for, and sparked the worst nuclear accident in a generation. AFP PHOTO / TOSHIFUMI KITAMURA (Photo credit should read TOSHIFUMI KITAMURA/AFP/Getty Images)
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JAPAN-DISASTER-ANNIVERSARY-TSUNAMI
Coast guard officers search for tsunami victims two years after, at the estuary of the Kyu Kitakami river in Ishinomaki, Miyagi prefecture on March 11, 2013. Japan on March 11 marked the second anniversary of a ferocious tsunami that claimed the lives of 15,881 people, with 2,668 others remaining unaccounted for, and sparked the worst nuclear accident in a generation. AFP PHOTO / TOSHIFUMI KITAMURA (Photo credit should read TOSHIFUMI KITAMURA/AFP/Getty Images)
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JAPAN-DISASTER-ANNIVERSARY-TSUNAMI
Relatives of tsunami victims pray at a memorial alter at the Okawa elementary school, where at least 70 students died in the 2011 tsunami, in Ishinomaki, Miyagi prefecture on March 11, 2013. Japan on March 11 marked the second anniversary of a ferocious tsunami that claimed the lives of 15,881 people, with 2,668 others remaining unaccounted for, and sparked the worst nuclear accident in a generation. AFP PHOTO / TOSHIFUMI KITAMURA (Photo credit should read TOSHIFUMI KITAMURA/AFP/Getty Images)
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JAPAN-DISASTER-ANNIVERSARY-TSUNAMI
People are reflected in the stone as they visit a memorial alter to pray at the Okawa elementary school, where at least 70 students died in the 2011 tsunami, in Ishinomaki, Miyagi prefecture on March 11, 2013. Japan on March 11 marked the second anniversary of a ferocious tsunami that claimed the lives of 15,881 people, with 2,668 others remaining unaccounted for, and sparked the worst nuclear accident in a generation. AFP PHOTO / TOSHIFUMI KITAMURA (Photo credit should read TOSHIFUMI KITAMURA/AFP/Getty Images)
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JAPAN-DISASTER-ANNIVERSARY-TSUNAMI
Police officers search for tsunami victims two years after the devastating disaster in Ishinomaki, Miyagi prefecture on March 11, 2013. Japan on March 11 marked the second anniversary of a ferocious tsunami that claimed the lives of 15,881 people, with 2,668 others remaining unaccounted for, and sparked the worst nuclear accident in a generation. JAPAN OUT AFP PHOTO / JIJI PRESS (Photo credit should read JIJI PRESS/AFP/Getty Images)
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JAPAN-DISASTER-ANNIVERSARY-TSUNAMI
Police officers walk on a mud-covered riverside field near the Okawa elementary school to start a tsunami victim search operation in Ishinomaki city, Miyagi prefecture on March 11, 2013. March 11, 2013 marks the second anniversary of the 9.0 magnitude earthquake that sent a huge wall of water into the coast of the Tohoku region, splintering whole communities, ruining swathes of prime farmland and killing nearly 19,000 people. AFP PHOTO / TOSHIFUMI KITAMURA (Photo credit should read TOSHIFUMI KITAMURA/AFP/Getty Images)
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JAPAN-DISASTER-ANNIVERSARY-TSUNAMI
Police officers walk on a mud-covered riverside field near the Okawa elementary school to start a tsunami victim search operation in Ishinomaki city, Miyagi prefecture on March 11, 2013. March 11, 2013 marks the second anniversary of the 9.0 magnitude earthquake that sent a huge wall of water into the coast of the Tohoku region, splintering whole communities, ruining swathes of prime farmland and killing nearly 19,000 people. AFP PHOTO / TOSHIFUMI KITAMURA (Photo credit should read TOSHIFUMI KITAMURA/AFP/Getty Images)
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JAPAN-DISASTER-ANNIVERSARY-TSUNAMI
Police officers (R) search for tsunami victims two years after, at a mud-covered riverside field near the Okawa elementary school in Ishinomaki city, Miyagi prefecture on March 11, 2013. March 11, 2013 marks the second anniversary of the 9.0 magnitude earthquake that sent a huge wall of water into the coast of the Tohoku region, splintering whole communities, ruining swathes of prime farmland and killing nearly 19,000 people. AFP PHOTO / TOSHIFUMI KITAMURA (Photo credit should read TOSHIFUMI KITAMURA/AFP/Getty Images)
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JAPAN-DISASTER-ANNIVERSARY-TSUNAMI
Police officers take part in a minute of silence at 14:46 during their search misson of tsunami victims at the mud-covered riverside field near the Okawa elementary school in Ishinomaki city, Miyagi prefecture on March 11, 2013. March 11, 2013 marks the second anniversary of the 9.0 magnitude earthquake that sent a huge wall of water into the coast of the Tohoku region, splintering whole communities, ruining swathes of prime farmland and killing nearly 19,000 people. AFP PHOTO / TOSHIFUMI KITAMURA (Photo credit should read TOSHIFUMI KITAMURA/AFP/Getty Images)
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JAPAN-DISASTER-ANNIVERSARY-TSUNAMI
Police officers carry bouquets of flowers as they return to recommence their search misson for tsunami victims at the mud-covered riverside field near the Okawa elementary school in Ishinomaki city, Miyagi prefecture on March 11, 2013 after offering a minute of silence at 14:46. March 11, 2013 marks the second anniversary of the 9.0 magnitude earthquake that sent a huge wall of water into the coast of the Tohoku region, splintering whole communities, ruining swathes of prime farmland and killing nearly 19,000 people. AFP PHOTO / TOSHIFUMI KITAMURA (Photo credit should read TOSHIFUMI KITAMURA/AFP/Getty Images)
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JAPAN-DISASTER-ACCIDENT-NUCLEAR-ANNIVERSARY
People offer silent prayers for victims of the tsunami at Arahama district in Sendai, Miyagi Prefecture on March 11, 2013. Japan on March 11 marked the second anniversary of a ferocious tsunami that claimed nearly 19,000 lives and sparked the worst nuclear accident in a generation. AFP PHOTO/Toru YAMANAKA (Photo credit should read TORU YAMANAKA/AFP/Getty Images)
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JAPAN-DISASTER-ANNIVERSARY-TSUNAMI
Wrecked vehicles remain in a field of reeds in Namie, two years after the March 11, 2011 tsunami and earthquake, near the striken TEPCO’s Fukushima Dai-ichi nuclear plant in Fukushima prefecture on March 11, 2013. March 11, 2013 marks the second anniversary of the 9.0 magnitude earthquake that sent a huge wall of water into the coast of the Tohoku region, splintering whole communities, ruining swathes of prime farmland and killing nearly 19,000 people. AFP PHOTO / YOSHIKAZU TSUNO (Photo credit should read YOSHIKAZU TSUNO/AFP/Getty Images)
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JAPAN-DISASTER-ANNIVERSARY-TSUNAMI
An elderly man sits as he and with his wife (not pictured) visit a cemetery to pay respects to their son who was killed i
n the March 2011 tsunami, in Minamisoma in Fukushima prefecture on March 11, 2013. March 11, 2013 marks the second anniversary of the 9.0 magnitude earthquake that sent a huge wall of water into the coast of the Tohoku region, splintering whole communities, ruining swathes of prime farmland and killing nearly 19,000 people. AFP PHOTO / YOSHIKAZU TSUNO (Photo credit should read YOSHIKAZU TSUNO/AFP/Getty Images) -
A boy prays for the March 11, 2011 earthquake and tsunami victims after offering a flower in Otsuchi, Iwate prefecture, northern Japan Sunday, March 10, 2013. Japan will mark the second anniversary of the disaster on Monday. (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT, NO LICENSING IN CHINA, HONG KONG, JAPAN, SOUTH KOREA AND FRANCE
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Residents pray in front of a memorial for the victims of the March 11, 2011 earthquake and tsunami as they make a brief visit to a caution zone in Namie, Fukushima prefecture, northern Japan Sunday, March 10, 2013. Japan will mark the second anniversary of the disaster on Monday. (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT, NO LICENSING IN CHINA, HONG KONG, JAPAN, SOUTH KOREA AND FRANCE
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Cars stop at a traffic signal in a snow covered deserted port area, which was engulfed by a tsunami after the March 11, 2011 earthquake, in Kesennuma, Miyagi Prefecture, northeastern Japan, at dawn on Monday, March 11, 2013. Japan is marking the second anniversary of its earthquake, tsunami and nuclear catastrophe. Memorial services are planned Monday in Tokyo and in barren towns along the battered northeastern coast to coincide the moment the magnitude-9.0 earthquake the strongest recorded in Japan’s history struck, unleashing a massive tsunami that killed nearly 19,000 people. (AP Photo/Koji Ueda)
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A man offers prayers in front of the main entrance of Okawa Elementary School where 74 of the 108 students went missing after the March 11 tsunami in Ishinomaki, Miyagi prefecture, Japan, Monday, March 11, 2013. The two-year anniversary Monday of Japan’s devastating earthquake, tsunami and nuclear catastrophe is serving to spotlight the stakes of the country’s struggles to clean up radiation, rebuild lost communities and determine new energy and economic strategies. (AP Photo/Shizuo Kambayashi)
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A woman prays during a rally against nuclear power plants as victims of the March 11, 2011 earthquake and tsunami are remembered, at a park in Tokyo, Monday, March 11, 2013. Japan marked the second anniversary on Monday of the devastating earthquake and tsunami that left nearly 19,000 people dead or missing. (AP Photo/Itsuo Inouye)
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People observe a moment of silence for the victims of the March 11, 2011 earthquake and tsunami during an event at a park in Tokyo, Monday, March 11, 2013. Japan marked the second anniversary on Monday of the devastating earthquake and tsunami that left nearly 19,000 people dead or missing. (AP Photo/Itsuo Inouye)
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Gathering around what is left of a disaster control center devastated by the March 11, 2011 earthquake and tsunami, people bow their heads Monday, March 11, 2013 in Minamisanriku, Miyagi prefecture, Japan, in a moment of silence at 2:46 p.m. when the magnitude 9.0 earthquake struck off Japan’s northeastern coast. Japan marked the second anniversary on Monday of a devastating disasters that left nearly 19,000 people dead or missing. (AP Photo/Shizuo Kambayashi)
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People offer prayer in a moment of silence in front of what is left of a disaster control center in an area devastated by the March 11, 2011 earthquake and tsunami in Minamisanriku, Miyagi Prefecture, Monday, March 11, 2013. Japan marked the second anniversary on Monday of the devastating disasters that left nearly 19,000 people dead or missing. (AP Photo/Shizuo Kambayashi)
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People observe a moment of silence in front of what is left of a disaster control center in an area devastated by the March 11, 2011 earthquake and tsunami, in Minamisanriku, Miyagi prefecture, in Japan, Monday, March 11, 2013. Japan marked the second anniversary on Monday of the devastating earthquake and tsunami that left nearly 19,000 people dead or missing.(AP Photo/Shizuo Kambayashi)
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People offer prayers in front of what is left of a disaster control center in an area devastated by the March 11, 2011 earthquake and tsunami, in Minamisanriku, Miyagi Prefecture, Monday, March 11, 2013. Japan marked the second anniversary on Monday of the devastating disasters that left nearly 19,000 people dead or missing. (AP Photo/Shizuo Kambayashi)
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A worker walks behind a white plastic plate cutout of the words of a local businessperson, declaring determination to reopen the business, in a tsunami-stricken area in Minamisanriku, Miyagi prefecture, northern Japan, Monday, March 11, 2013. Japan marked the second anniversary on Monday of a devastating earthquake and tsunami that left nearly 19,000 people dead or missing. The words mean; I will restart my business from zero like my ancestor. (AP Photo/Shizuo Kambayashi)
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A man points to the name of one of the victims of the earthquake and tsunami inscribed in a cenotaph in Okawa district in Ishinomaki, Miyagi Prefecture, northern Japan, Monday, March 11, 2013. Japan marked the second anniversary on Monday of a devastating earthquake and tsunami that left nearly 19,000 people dead or missing. (AP Photo/Shizuo Kambayashi)
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People observe a moment of silence for the victims of the March 11, 2011 earthquake and tsunami during an event at a park in Tokyo, Monday, March 11, 2013. (AP Photo/Itsuo Inouye)
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Aerial
Red and white cranes stand by reactors of the tsunami-ravaged Fukushima Dai-ichi nuclear power plant in Fukushima Prefecture, northeastern Japan, Monday morning, March 11, 2013. The two-year anniversary Monday of Japans devastating earthquake, tsunami and nuclear catastrophe is serving to spotlight the stakes of the countrys struggles to clean up radiation, rebuild lost communities and determine new energy and economic strategies. (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT, NO LICENSING IN CHINA, HONG KONG, JAPAN, SOUTH KOREA AND FRANCE
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People offer prayers as a Buddhist monk chants a sutra for tsunami victims to mark the second anniversary of the 2011 earthquake an tsunami on a beach in Arahama in Sendai, Miyagi Prefecture, Japan, Monday morning, March 11, 2013. Japan marked the second anniversary of the disasters, that killed nearly 19, 000 people in areas along Japan’s northeastern coast. (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT, NO LICENSING IN CHINA, HONG KONG, JAPAN, SOUTH KOREA AND FRANCE
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An artificially-restored “miracle pine tree,” that survived the March 11, 2011 tsunami, is silhouetted against the rising sun in Rikuzentakata, Iwate prefecture, Japan, Monday, March 11, 2013. Japan marked the second anniversary of its earthquake, tsunami and nuclear catastrophe, that killed nearly 19, 000 people in areas along Japan’s northeastern coast. The 27-meter (88-foot and 7-inch)-tall tree, a single survivor among 70,000 trees in a forest along the coast, has just been restored in a project to preserve it. (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT, NO LICENSING IN CHINA, HONG KONG, JAPAN, SOUTH KOREA AND FRANCE
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People offer prayers in front of a memorial cenotaph for tsunami victims on a beach in Arahama in Sendai, Miyagi Prefecture, Japan, Monday morning, March 11, 2013. Japan marked the second anniversary of its earthquake, tsunami and nuclear catastrophe, that killed nearly 19, 000 people in areas along Japan’s northeastern coast. (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT, NO LICENSING IN CHINA, HONG KONG, JAPAN, SOUTH KOREA AND FRANCE
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Police officers search for the remains of those who went missing in the March 11, 2011 tsunami on the coastlin
e in Ishinomaki, Miyagi Prefecture, northern Japan, Monday, March 11, 2013. The two-year anniversary Monday of Japan’s devastating earthquake, tsunami and nuclear catastrophe is serving to spotlight the stakes of the country’s struggles to clean up radiation, rebuild lost communities and determine new energy and economic strategies.(AP Photo/Shizuo Kambayashi) -
Women approach Okawa Elementary School where 74 of the 108 students went missing after the March 11 tsunami in Ishinomaki, Miyagi prefecture, Japan, Monday, March 11, 2013. The two-year anniversary Monday of Japan’s devastating earthquake, tsunami and nuclear catastrophe is serving to spotlight the stakes of the country’s struggles to clean up radiation, rebuild lost communities and determine new energy and economic strategies. (AP Photo/Shizuo Kambayashi)