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Radioactive leak plugged, officials now eye hydrogen buildup: Japan nuclear timeline

Officials say workers have stopped highly radioactive water from leaking into the ocean from the stricken Fukushima Daiichi nuclear plant's No. 2 reactor. Concerns now center on a buildup of hydrogen inside reactor No. 1.

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A US military barge carrying pure water (bottom) leaves the quay near Tokyo Electric Power Co.'s Fukushima Daiichi Nuclear Power Plant to refill with pure water in Fukushima Prefecture, April 4. Japan officials say workers have stopped highly radioactive water leaking into the sea on Wednesday from the crippled nuclear plant and said it could have given more information to neighboring countries about contamination in the ocean. Nuclear experts are now concerned about possible damage to the core of reactor No.1.

Japan Maritime Self-Defence Force/Reuters

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This timeline will be updated with the latest nuclear developments in Japan.

Week 4, April 4 - April 8

April 6: Emergency workers have managed to stop the radioactive water, measured at 7.5 million times the legal limit, from leaking out of the Fukushima Daiichi nuclear plant's reactor No. 2 and into the ocean, say officials. Plant operator Tepco is now concerned about a build-up of hydrogen inside reactor No. 1, which may mean the reactor's core is damaged. As a precautionary measure, officials say workers are preparing to inject nitrogen into the containment vessel to try to bring the reactor under control. Meanwhile, Japan's official spokesperson, Yukio Edano apologized to neighboring countries for not notifying them before they started pumping low-level radioactive water into the ocean this past weekend.

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