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Edition: U.S. Article Comments (2) Video Climate Change and Health Will climate change make us sick? Join Reuters Health Executive Editor Ivan Oransky today at noon EDT for a discussion of this issue with the authors of the new book, "Changing Planet, Changing Health," Dr. Paul Epstein and Dan Ferber, and have a chance to ask questions. Live Coverage Follow Reuters Facebook Twitter RSS YouTube Read U.S. attacks militants in Pakistan as pressure grows | 7:39am EDT Do bedbugs carry superbugs? 6:10am EDT Dark drama about school killing spree jolts Cannes 10:37am EDT Senator describes "gruesome" bin Laden photos 11 May 2011 Wall Street slips with commodities, inflation fears 11:08am EDT Discussed 148 Obama at U.S. base to pay tribute to bin Laden mission 130 Boehner demands trillion-dollar cuts in debt deal 112 Son says bin Laden sea burial demeans family: report Watched Deadly earthquake rocks Spain Wed, May 11 2011 Russia 'shot down Georgia' drone Mon, Apr 21 2008 Commodities sink as dollar rebounds Wed, May 11 2011 Fukushima reactor water leak risks delaying crisis plan Tweet Share this By Yoko Kubota TOKYO (Reuters) - Japan's crippled Fukushima nuclear power plant is leaking water from the center of the reactor seen as the closest to stabilizing, its operator said on Thursday, risking a delay in its plan to resolve the worst... Email Print Related News Japan delays unveiling of Tepco compensation plan: PM 9:10am EDT Analysis & Opinion Enviro-word of the moment: Anthropocene Did human activities cause the Mississippi River flood? Related Topics World » Japan » Nuclear Power » Green Business » Stocks Related Video Tokyo to unveil $62 bln TEPCO fund Wed, May 11 2011 Workers wearing protective suits stand after water stopped flowing at the pit near the water intake canal of the Fukushima Daiichi Nuclear Power Station No.3 reactor, May 11, 2011. Credit: Reuters/Tokyo Electric Power Co By Yoko Kubota TOKYO | Thu May 12, 2011 10:01am EDT TOKYO (Reuters) - Japan's crippled Fukushima nuclear power plant is leaking water from the center of the reactor seen as the closest to stabilizing, its operator said on Thursday, risking a delay in its plan to resolve the worst nuclear disaster since Chernobyl. The discovery of the leak, through a hole in the container that houses the reactor core, provides new insight into the sequence of events that triggered a partial meltdown of the uranium fuel in the No. 1 reactor at Fukushima after the plant was struck by a massive earthquake and tsunami on March 11, officials said. The battle to bring Fukushima under control has been complicated by repeated leaks of radioactive water, threatening both the nearby Pacific Ocean and nearby groundwater. Workers at the Fukushima Daiichi nuclear plant have been pumping water into four of the six reactors on the site to bring their nuclear fuel rods to a "cold shutdown" state by January. But after repairing a gauge in the No. 1 reactor earlier this week, Tokyo Electric Power Co discovered that the water level in the pressure vessel that contains its uranium fuel rods had dropped about 5 meters (16 ft) below the targeted level to cover the fuel under normal operating conditions. "There must be a large leak," Junichi Matsumoto, a general manager at the utility also known as TEPCO, told a news conference. "The fuel pellets likely melted and fell, and in the process may have damaged ... the pressure vessel itself and created a hole," he added. Since the surface temperature of the pressure vessel has been holding steady between 100 and 120 degrees Celsius, Matsumoto said the effort to cool the melted uranium fuel by pumping in water was working and would continue. Based on the amount of water that is remaining around the partially melted and collapsed fuel, Matsumoto estimated that the pressure vessel had developed a hole of several centimeters in diameter. The finding makes it likely that at one point in the immediate wake of the disaster the 4-meter-high stack of uranium-rich rods at the core of the reactor had been entirely exposed to the air, he said. Boiling water reactors like those at Fukushima rely on water as both a coolant and a barrier to radiation. Matsumoto said the utility would study whether to increase the amount of water it was injecting to overcome the leak and raise the level of water covering the fuel, at the risk of allowing more radioactive water to leak out of the facility. Nearly 10,400 metric tons of water has been pumped into the reactor so far, but it is unclear where the leaked water has been going. The high radiation levels makes it difficult for workers to check the site, Matsumoto said. TEPCO announced a timetable last month for addressing the crisis, saying it aimed to cool reactors to a stable level and reduce the leakage of radiation within the first three months, then bring the reactors to a cold shutdown in another three to six months. TEPCO is set to review its timetable for stabilizing Fukushima on May 17 and officials indicated that the initial progress targets could slip. Officials had planned to use the same set of steps to stabilize reactors No. 2 and No. 3 that are under way at No. 1, which workers re-entered last week for the first time since the earthquake. But Matsumoto said it was likely that the pressure vessels in the other two reactors could be leaking as well if fuel rods had collapsed and melted after the earthquake and tsunami. "It is necessary to make a reassessment of the condition of the nuclear reactor," Chief Cabinet Secretary Yukio Edano told a news conference. On Wednesday, TEPCO sealed a fresh leak of contaminated water found near the No. 3 reactor that may have seeped into the Pacific Ocean from the coastal plant. A previous ocean leak sparked international concern about the impact of the disaster on the environment. Traces of radioactive cesium were detected in sewage treatment centers in Ibaraki and Kanagawa prefectures, both to the south of Fukushima, Japanese media reported on Thursday. (Additional reporting by Elaine Lies; Editing by Kevin Krolicki and Edmund Klamann) World Japan Nuclear Power Green Business 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 (2) swebdizajn wrote: We are engaged in design and we would like to be from http://www.swebdizajn.com help Japan, the allocation percentage of our earnings, because Japan is our country selflessly helped and still helps. If someone wanted to tell us the address where we can send help. Thanks May 12, 2011 8:53am EDT -- Report as abuse gruven137 wrote: So the core is exposed in Reactor #1 and has more than likely been that way since the quake….which means TEPCO and the government have been lying to everyone all along. May 12, 2011 11:12am 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. 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