A robot's attempt to get a sample of the melted nuclear fuel at Japan's damaged reactor is suspended

Associated Press Finance08-22

TOKYO (AP) — An attempt to use a telescoping robot to remove a sample of melted fuel from a wrecked reactor at Japan’s tsunami-hit Fukushima Daiichi nuclear power plant was suspended Thursday due to a...

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No specific plans for the full removal of t","collect":0,"end_time":0,"defaultTopTitle":"yahoo.com","property":[],"viewcount":null,"language":"en","relate_stocks":{"TKECF":"Tokyo Electric Power Company Holdings","TKECY":"Tokyo Electric Power Company Holdings","BK4081":"电力公用事业","BK4006":"钢铁","AP":"安博科-匹兹堡"},"translate_title":"机器人在日本受损反应堆获取熔化核燃料样本的尝试被暂停","themeId":null,"isJumpTheme":false,"ttsUrl":null,"symbols_score_info":{"AP":1,"TKECF":0.9,"TKECY":0.9},"content_text":"TOKYO (AP) — An attempt to use a telescoping robot to remove a sample of melted fuel from a wrecked reactor at Japan’s tsunami-hit Fukushima Daiichi nuclear power plant was suspended Thursday due to a technical issue.\nThe collection of a tiny sample of the debris inside the Unit 2 reactor’s primary containment vessel would start the fuel debris removal phase, the most challenging part of the decades-long decommissioning of the plant where three reactors were destroyed in the March 11, 2011, magnitude 9.0 earthquake and tsunami disaster.\nThe work was stopped Thursday morning when workers noticed that five 1.5-meter (5-foot) pipes used to maneuver the robot were placed in the wrong order and could not be corrected within the time limit for their radiation exposure, the plant operator Tokyo Electric Power Company Holdings said. \nThe pipes were to be used to push the robot inside and pull it back out when it finished. Once inside the vessel, the robot is operated remotely from a safer location.\nThe robot can extend up to 22 meters (72 feet) to reach its target area to collect a fragment from the surface of the melted fuel mound using a device equipped with tongs that hang from the tip of the robot. \nThe mission to obtain the fragment and return with it is to last two weeks. TEPCO said a new start date is undecided.\nThe sample-return mission is a first crucial step of a decades-long decommissioning at the Fukushima Daiichi. But its goal to bring back less than 3 grams (0.1 ounce) of an estimated 880 tons of fatally radioactive molten fuel underscores the daunting challenges. \nDespite the small amount of the debris sample, it will provide key data to develop future decommissioning methods and necessary technology and robots, experts say.\nBetter understanding of the melted fuel debris is key to decommissioning the three wrecked reactors and the entire plant. \nThe government and TEPCO are sticking to a 30-40-year cleanup target set soon after the meltdown, despite criticism it is unrealistic. 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