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People wearing surgical masks leave Shimbashi train station in Tokyo Wednesday, March 16, 2011. The nuclear crisis has triggered international alarm and partly overshadowed the human tragedy caused by Friday's earthquake and the subsequent tsunami. (AP Photo/Eugene Hoshiko)

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BABY MONITOR: A baby is checked for radiation exposure on Tuesday in Nihonmatsu, a city in Fukushima, where another explosion and a fire at a nuclear-power plant sent radiation levels above normal. (Kyodo News via Associated Press)

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Japan Self-Defense Force members search for survivors of the earthquake and tsunami Tuesday in the devastated city of Ofunato, Japan. (Associated Press)

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Japanese Prime Minister Naoto Kan discusses the disaster at the prime minister's official residence in Tokyo on Tuesday. Mr. Kan said the risks of further radiation leaks are increasing after an explosion at a nuclear power plant in Fukushima. (Bloomberg)

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A grain elevator and water tower are seen from an unsurfaced road into Freeport, Kan., a town of just five people. (Associated Press)

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This satellite image provided by DigitalGlobe shows the damaged Fukushima Dai-ichi nuclear facility in northeastern Japan on Monday, March 14, 2011. (AP Photo/DigitalGlobe)

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Villagers walk across sea of debris after they visited their homes, which were destroyed by Friday's tsunami, in Minamisanriku, in Japan's Miyagi Prefecture, on Tuesday, March 15, 2011. Japan's strongest recorded earthquake and subsequent tsunami slammed the country's eastern coast. (AP Photo/Shuji Kajiyama)

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German Chancellor Angela Merkel speaks during a joint news conference with Vice Chancellor Guido Westerwelle in Berlin on Monday, March 14, 2011, at which the government said it is suspending for three months a decision to extend the life of its nuclear power plants. (AP Photo/Michael Sohn)

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A member of a British rescue team searches for victims in the tsunami-hit area in Ofunato, Iwate Prefecture, Japan, on Tuesday, March 15, 2011, four days after the disastrous earthquake and ensuing tsunami struck. (AP Photo/Itsuo Inouye)

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One critic says Energy Secretary Steven Chu has been strangely absent from the public discourse on nuclear power in the wake of the Japanese nuclear calamity.

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People walk along a road between the rubble of destroyed buildings in Minamisanriku, Miyagi prefecture, northern Japan on Monday. (Yomiuri Shimbun via Associated Press)

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Evacuees gather around candlelight at a blacked-out shelter in Yamamoto, Miyagi prefecture, northern Japan on Monday, three days after northeastern coastal towns were devastated by an earthquake and subsequent tsunami. (Kyodo News via Associated Press)

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A man checks out a stock price board in Tokyo on Monday as the stock market plunged on its first business day after an earthquake and tsunami laid waste to cities along Japan's northeast coast. (Associated Press)

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One critic says Energy Secretary Steven Chu has been strangely absent from the public discourse on nuclear power in the wake of the Japanese nuclear calamity.

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Rescue workers carry an elderly man found alive by tsunami survivors after he was buried under rubble along a slope of a hill in Minamisanriku in Japan's Miyagi Prefecture on Monday, March 14, 2011, three days after a powerful earthquake-triggered tsunami hit the country's northeast coast. (AP Photo/The Yomiuri Shimbun, Hiroaki Ohno)

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A ferry is stranded atop a building in Otsuchi, Iwate Prefecture, in northern Japan on Sunday, March 13, 2011, two days after a powerful earthquake-triggered tsunami hit the country's east coast. (AP Photo/The Yomiuri Shimbun)

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In this image made from Japan's NTV/NNN Japan television footage, flames from the Fukushima Dai-ichi nuclear plant's Unit 3 rise in Okumamachi, Japan, on Monday, March 14, 2011. The second hydrogen explosion in three days rocked the stricken nuclear plant Monday, sending a massive column of smoke into the air and wounding 11 workers. (AP Photo/NTV/NNN Japan)

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In this image made frp, Japan's NTV/NNN Japan television footage, smoke ascends from the Fukushima Dai-ichi nuclear plant's Unit 3 in Okumamachi, Fukushima Prefecture, in northern Japan, on Monday, March 14, 2011. The second hydrogen explosion in three days rocked Japan's stricken nuclear plant, sending a massive column of smoke into the air and wounding 11 workers. (AP Photo/NTV/NNN Japan)

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Police lead rescue teams in the search for survivors among the damaged buildings and tsunami debris in Rikuzentakada, Iwate Prefecture, Japan, on Monday, March 14, 2011. Workers battled to prevent a nuclear meltdown after a second blast rocked an atomic plant north of Tokyo, as helicopters and convoys of army trucks headed toward areas hit hardest by Japan's strongest earthquake. (Koichi Kamoshida/Bloomberg)

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A fuel tanker sits submerged in water next to tsunami-damaged buildings in Rikuzentakada, Iwate Prefecture, Japan, on Monday, March 14, 2011. Workers battled to prevent a nuclear meltdown after a second blast rocked an atomic plant north of Tokyo, as helicopters and convoys of army trucks headed toward areas hardest hit by Japan's strongest earthquake. (Koichi Kamoshida/Bloomberg)