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Edition: U.S. Article Comments (5) Slideshow Video Full Focus Editor's choice A selection of our top photos from the past 24 hours. Full Article Follow Reuters Facebook Twitter RSS YouTube Read Obama and Congress to try reaching spending-cut deal | 1:08am EDT Japan tackles hydrogen build-up, radiation concerns spread | 12:56am EDT Ouattara forces lay siege to Ivory Coast's Gbagbo | 1:29am EDT Maine legalizing switchblades for one-armed people 06 Apr 2011 Dish expands its scope with Blockbuster win 06 Apr 2011 Discussed 112 U.S. to reach debt limit by May 16: Geithner 78 Stumbling blocks remain in budget fight 71 US Republican budget plan would cut $5.8 trln in 10 yrs Watched Robotic bird takes flight into the future Mon, Apr 4 2011 High price for a government shutdown Wed, Apr 6 2011 Cisco's mea culpa Tue, Apr 5 2011 Japan tackles hydrogen build-up, radiation concerns spread Tweet Share this By Mayumi Negishi and Yoko Nishikawa TOKYO (Reuters) - Japan pumped nitrogen into a crippled nuclear reactor Thursday, trying to prevent an explosive build-up of hydrogen gas, as the world's worst nuclear disaster in 25 years fired debate over the... Email Print Factbox Japan's disaster in figures Wed, Apr 6 2011 Related News NRC says not clear that Japan reactor has melted vessel Wed, Apr 6 2011 China finds very low levels of radiation in spinach Wed, Apr 6 2011 Japan plans 3 trillion yen extra budget, no debt issue: report Wed, Apr 6 2011 Japan may order Tokyo-area industry to conserve power Wed, Apr 6 2011 SNAPSHOT-Japan's nuclear crisis Wed, Apr 6 2011 Soil outside 30 km Fukushima zone safe for farming Wed, Apr 6 2011 Some South Korean schools close over radioactive rain concerns Wed, Apr 6 2011 Analysis & Opinion Full transcript of Robert Zoellick Newsmaker Transocean bonus mess makes Goldman look sensitive Related Topics World » United Nations » Japan » Natural Disasters » Stocks Related Video Radioactive water leak plugged Wed, Apr 6 2011 Fukushima children return to school Nuclear leak stopped Japan's tsunami survivors seek work 1 / 22 A U.S. military barge carrying pure water (bottom) leaves the quay near the Fukushima Daiichi Nuclear Power Plant to refill with pure water, April 6, 2011. Credit: Reuters/Japan Maritime Self-Defence Force By Mayumi Negishi and Yoko Nishikawa TOKYO | Thu Apr 7, 2011 12:56am EDT TOKYO (Reuters) - Japan pumped nitrogen into a crippled nuclear reactor Thursday, trying to prevent an explosive build-up of hydrogen gas, as the world's worst nuclear disaster in 25 years fired debate over the safety of atomic power in the United States. In a sign of growing international concern over radiation fall-out from the earthquake-wrecked Japanese plant, some schools in neighboring South Korea closed because parents were worried that rain there might be toxic. Latest data, meanwhile, showed that foreign tourists were shunning Japan during what would normally be one of the most popular seasons to visit the country. Engineers have been working since Wednesday night to pump nitrogen gas into the containment vessel of reactor No.1 at the Fukushima Daiichi power plant, which was smashed by a 10-meter tsunami that followed the massive earthquake of March 11. An official at plant operator Tokyo Electric Power (TEPCO) insisted that it was a precautionary measure and the chances were "extremely small" of a repeat of hydrogen gas explosions that ripped through two reactors early in the crisis. But while the government says the situation has stabilized at the devastated plant, 240 km (150 miles) north of Tokyo, it is still far from under control. "Data shows the reactors are in a stable condition, but we are not out of the woods yet," Chief Cabinet Secretary Yukio Edano told reporters. One TEPCO official said 6,000 cubic meters (212,000 cubic feet) of nitrogen gas would be pumped into reactor No.1 and the utility was preparing gas injections for reactors No.2 and No.3 in the six-reactor plant as a safety precaution. Engineers did manage Wednesday to finally plug a leak at reactor No.2, but they still need to pump 11.5 million liters (11,500 tonnes) of contaminated water back into the ocean because they have run out of storage space at the facility. The water was used to cool overheated fuel rods. Workers are struggling to restart cooling pumps -- which recycle the water -- in four damaged reactors. Until those are fixed, they must pump in water to prevent overheating and meltdowns, but have run out of storage capacity for the seawater when it becomes contaminated. SAFETY CONCERNS In Vienna, the head of a U.N. scientific body said based on the information he had now, the Fukushima accident was not expected to have any serious impact on people's health. Wolfgang Weiss, chairman of the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR), said the Fukushima disaster was less dramatic than Chernobyl in 1986 but "much more serious" than Three Mile Island in 1979. "We have seen traces of iodine in the air all over the world now but they are much, much, much lower than traces we have seen at similar distances after Chernobyl," he added. 1 2 Next World United Nations Japan Natural Disasters Tweet this Share this Link this Digg this Email Reprints We welcome comments that advance the story directly or with relevant tangential information. We try to block comments that use offensive language, all capital letters or appear to be spam, and we review comments frequently to ensure they meet our standards. If you see a comment that you believe is irrelevant or inappropriate, you can flag it to our editors by using the report abuse links. Views expressed in the comments do not represent those of Reuters. Comments (5) amos033 wrote: This event will continue to grow more and more serious each day. We must all pray that Japan emerges from this disaster. Apr 06, 2011 10:15pm EDT -- Report as abuse jburt56 wrote: What about the spent fuel pools? Are there leaks there? Apr 06, 2011 10:40pm EDT -- Report as abuse geoalfa wrote: I’m shorting japan,this will get worse. Apr 06, 2011 10:49pm EDT -- Report as abuse See All Comments » Add Your Comment Social Stream (What's this?) © Copyright 2011 Thomson Reuters Editorial Editions: Africa Arabic Argentina Brazil Canada China France Germany India Italy Japan Latin America Mexico Russia Spain United Kingdom United States Reuters Contact Us Advertise With Us Help Journalism Handbook Archive Site Index Video Index Reader Feedback Mobile Newsletters RSS Podcasts Widgets Your View Analyst Research Thomson Reuters Copyright Disclaimer Privacy Professional Products Professional Products Support Financial Products About Thomson Reuters Careers Online Products Acquisitions Monthly Buyouts Venture Capital Journal International Financing Review Project Finance International PEhub.com PE Week FindLaw Super Lawyers Attorney Rating Service Reuters on Facebook Thomson Reuters is the world's largest international multimedia news agency, providing investing news, world news, business news, technology news, headline news, small business news, news alerts, personal finance, stock market, and mutual funds information available on Reuters.com, video, mobile, and interactive television platforms. Thomson Reuters journalists are subject to an Editorial Handbook which requires fair presentation and disclosure of relevant interests. NYSE and AMEX quotes delayed by at least 20 minutes. Nasdaq delayed by at least 15 minutes. For a complete list of exchanges and delays, please click here.

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