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Full Article Follow Reuters Facebook Twitter RSS YouTube Read Texas county official says "stupid" feds sparked fire 13 May 2011 Strauss-Kahn, France's would-be president 4:41am EDT IMF's Dominique Strauss-Kahn faces sex charges | 11:30am EDT Socialist boss calls Strauss-Kahn arrest "thunderbolt" 6:31am EDT CORRECTED - Strauss-Kahn lawyer says must remain calm over arrest 4:54am EDT Discussed 125 Son says bin Laden sea burial demeans family: report 81 Texas county official says ”stupid” feds sparked fire 63 Obama administration fights to save healthcare law Watched Fire ants form rafts to defy floods Tue, Apr 26 2011 Croatian magnet boy displays attractive talent Fri, May 13 2011 Under pressure, Obama seeks more drilling Sat, May 14 2011 Japan readies new tactics for Fukushima after setback Tweet Share this By Rie Ishiguro and Kevin Krolicki TOKYO (Reuters) - Japanese officials are readying a new approach to cooling reactors at the Fukushima nuclear plant after discovering an Olympic swimming pool-sized pond of radioactive water in the basement of a... Email Print Related News Japan approves Tepco nuclear claims plan, reactor leaks Fri, May 13 2011 Analyst View: Japan approves nuclear crisis compensation scheme Fri, May 13 2011 Fukushima reactor has a hole, leading to leakage Thu, May 12 2011 Room for improvement at U.S. nuclear plants: task force Thu, May 12 2011 Japan delays unveiling of Tepco compensation plan: PM Thu, May 12 2011 Analysis & Opinion Chernobyl graves Back in the nuclear zone Related Topics World Home » Japan » Nuclear Power » Stocks 1 / 2 The crippled Fukushima Daiichi Nuclear Power plant is seen in Fukushima Prefecture in this undated handout photo released by Tokyo Electric Power Co. (TEPCO) April 14, 2011. Credit: Reuters/Tokyo Electric Power Co. (TEPCO)/Handout By Rie Ishiguro and Kevin Krolicki TOKYO | Sun May 15, 2011 7:04am EDT TOKYO (Reuters) - Japanese officials are readying a new approach to cooling reactors at the Fukushima nuclear plant after discovering an Olympic swimming pool-sized pond of radioactive water in the basement of a unit crippled by the March earthquake and tsunami. The discovery has forced officials to abandon their original plan to bring under control the No. 1 reactor at the Fukushima Daiichi plant as they focus on how to deal with the rising pool that some experts see as a threat to groundwater and the Pacific coast. Despite the setback, Japanese nuclear safety officials and the plant's operator, Tokyo Electric Power (TEPCO), plan to stick to a target of stabilizing the plant and bringing its reactors to a state of "cold shutdown" by January. At that point, the fuel at the core of the reactors would have dropped in temperature and no longer be capable of boiling the surrounding water. "We want to preserve the timetable, but at the same time we're going to have to change our approach," Goshi Hosono, an adviser to Prime Minister Naoto Kan, told a television talk show on Sunday. Some outside experts have questioned whether the initial timetable for Fukushima was too optimistic. The 9.0 magnitude earthquake and the tsunami that followed unleashed the worst nuclear accident since Chernobyl in Ukraine in 1986. "We would be cautious about saying the danger is over until the decontamination and cleanup of the site are well under way with no more leakage," Serge Gas, a spokesman for the Paris-based Nuclear Energy Agency, said in an email. Tepco is scheduled to provide an update on progress on Tuesday. In a pair of television appearances on Sunday, Hosonosaid the government would announce its own timetable then as well. Tepco is preparing to pay compensation to thousands of residents, farmers, fisherman and businesses for the disaster under a plan directed and partly funded by the government. The earthquake and ensuing 15-meter (46.5-foot) tsunami devastated Japan's northeastern coast, killing more than 15,000 people. A further 9,500 are still missing. 'WE HAVE A PROBLEM' Details emerged about the state of the No. 1 reactor in the past week. Progress to bring the unit under control has been seen as a test case for how quickly work on three other damaged reactors can proceed. Among the revelations: the fuel in the reactor melted down after the earthquake and dropped to the bottom of the pressure vessel at the reactor's core about 16 hours after the quake struck. A robot on the first floor of the reactor building on Friday recorded radiation of 2,000 millisieverts per hour. At that level workers could stay in the vicinity for no longer than eight minutes before exceeding exposure limits. In addition, the reactor's containment vessel has leaked large amounts of radioactive water into the reactor building. On Saturday, a Tepco worker was able to peer into the basement of the No.1 reactor and saw it had filled to almost half its 11-meter (35-foot) height -- an estimated 3,000 tonnes, larger than the volume of an Olympic swimming pool. Critics have said that pumping in large amounts of water -- more than 10,000 tonnes in No. 1 reactor alone - could pose grave environmental risks. Hidehiko Nishiyama, a spokesman for the Nuclear and Industrial Safety Agency, said new steps were being readied to treat and store radioactive water at Fukushima. As a first step, a massive barge set out for Fukushima on Sunday. The 136-meter long "Mega-Float" had been used as an artificial island for fishing in Shizuoka, south of Tokyo. It will be turned into a floating storage site for water with low levels of radioactivity starting in June. Among the major risks ahead, experts say, is the prospect of another hydrogen explosion like those believed to have destroyed parts of the buildings housing reactors No. 3 and No. 4. Officials also remain worried about structural damage to the No. 4 reactor and whether its storage pool for spent fuel rods has sufficient support. A strong aftershock could topple the structure and spill and scatter radioactive fuel on the ground, compounding the crisis, experts have said. Nishiyama said that Japanese officials "don't believe it is in danger of immediate collapse," but want to shore up the No. 4 reactor with new steel girders and cement. (Additional reporting by Scott DiSavino in New York; Editing by Daniel Magnowski) World Home Japan Nuclear Power Tweet this Link this Share 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 (0) Be the first to comment on reuters.com. Add yours using the box above. 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