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  1. Nuclear Power: Robot probes show Japan reactor cleanup worse than expected

    This Feb. 16, 2017 photo released by Tokyo Electric Power Co. (TEPCO) shows a remote-controlled "scorpion" robot inside the Unit 2 reactor's containment vessel at Fukushima Dai-ichi nuclear power plant in Okuma town, Fukushima prefecture, northeastern Japan. Robot probes sent to one of Japan's wrecked Fukushima nuclear reactors have suggested worse-than-anticipated challenges for the plant's ongoing cleanup. (TEPCO via AP Photo) TOKYO (AP) — Robot probes sent to one of Japan's wrecked Fukushima nuclear reactors have suggested worse-than-anticipated challenges for the plant's ongoing cleanup. The plant's operator Tokyo Electric Power Co. said the remote-controlled "scorpion" robot was sent into the Unit 2 reactor's containment vessel Thursday to investigate the area around the core that had melted six years ago, but its crawling function failed while climbing over highly radioactive debris. The robot, carrying a dosimeter , thermometer and two small cameras, transmitted some data and visuals but could not locate melted fuel — key information to determine how to remove debris out of the reactor. The robot was abandoned inside the vessel at a location where it won't block a future probe. Preliminary examinations over the past few weeks have detected structural damage to planned robot routes and higher-than-expected radiation inside the Unit 2 containment chamber, suggesting the need to revise robot designs and probes. Similar probes are being planned for the two other melted reactors. A tiny waterproof robot that can go underwater will be sent to Unit 1 in coming weeks, but experts haven't figured out a way to access badly torn Unit 3. TEPCO needs to know the melted fuel's exact location and condition and other structural damage in each of the three wrecked reactors to figure out the best and safest ways to remove the fuel. Despite the incomplete probe missions, TEPCO stuck to its schedule to determine methods for the melted fuel removal this summer and start work in 2021, company spokesman Yuichi Okamura said. TEPCO is struggling with the plant's decommissioning, which is expected to last decades, following the 2011 earthquake and tsunami that led to the meltdown. Tens of thousands of residents had evacuated their homes, many of them still unable to return due to high radiation. Earlier this month, another robot, designed for cleaning debris for the main "scorpion" probe, had to return midway through because two of its cameras became inoperable after two hours when its total radiation exposure reached a maximum tolerance of 1,000 Sievert — a level that can kill a human within seconds. The original duration planned for the robot was 10 hours, or 100 Sievert per hour. Inadequate cleaning, high radiation and structural damage could limit subsequent probes, and may require more radiation-resistant cameras and other equipment, TEPCO officials said. TEPCO officials said that despite the dangerously high figures, radiation is not leaking outside of the reactor. Images captured from inside the chamber have showed damage and structures coated with molten material, possibly mixed with melted nuclear fuel, and part of a disc platform hanging below the melted core.

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    Sat, 18 Feb 2017

  2. The world’s largest nuclear plants differ by age, number of reactors, and utilization

    There are currently 449 operating nuclear reactors in 31 countries, with a total installed generating capacity of more than 390,000 megawatts (MW). Nuclear power plants differ in various ways including reactor types, vessel containments, cooling methods, and dispatch purposes.

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    Wed, 8 Feb 2017

  3. Nuclear Power: Heysham reactor shuts for planned maintenance

    One of the nuclear reactors at Heysham 1 nuclear power station in Lancashire has been taken out of service for a major maintenance programme.

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    Wed, 8 Feb 2017

  4. GE Hitachi, Southern Nuclear to collaborate on advanced nuclear reactors

    GE Hitachi Nuclear Energy and Southern Nuclear have agreed to collaborate in studying the development and licensing of advanced nuclear reactors including GEH’s PRISM sodium-cooled fast reactor design 

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    Wed, 2 Nov 2016

  1. Small nuclear reactor design submitted for federal approval

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    Wed, 18 Jan 2017

  2. Proposed nuclear reactor closer to federal approval

    A proposed nuclear reactor outside Richmond, Virginia is one step closer to getting federal approval

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    Mon, 23 Jan 2017

  3. Nuclear Power: Proposed nuclear reactor 1 step closer to federal approval

    A proposed nuclear reactor outside Richmond is one step closer to getting federal approval.

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    Sat, 21 Jan 2017

  4. Ten Nuclear Plants Came Online in 2016, 55 under construction

    Five came online in China, and one each were in India, Pakistan, Russia, South Korea and the United States.

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    Mon, 30 Jan 2017

  5. Nuclear Power: Federal agency inspects generator at nuke plant near Phoenix

    The Nuclear Regulatory Commission began a special inspection Monday at the Palo Verde Nuclear Generating Station west of Phoenix after an emergency diesel generator failed during testing two months ago.

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    Wed, 8 Feb 2017

  6. 17 U.S. Nuclear Reactors Use Parts From Forge Under Probe

    NRC officials have determined the falsification of documents currently doesn’t pose any safety concerns to U.S. nuclear plants.

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    Wed, 11 Jan 2017

  7. Fluor’s NuScale submits small modular nuclear reactor design certification to NRC

    Fluor has supported NuScale since October 2011

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    Fri, 13 Jan 2017

  8. NRC: No Safety Issues to Prevent Third Nuclear Reactor at North Anna

    The commission’s final safety evaluation report comes in response to a 2007 application from Dominion.

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    Fri, 20 Jan 2017

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