Nuclear Industry Report: ‘Reduced stability’ of fuel pool in Fukushima Unit 4; Admits there’s damaged fuel inside? — Gundersen: Fuel racks moved and damaged; Fallen debris distorted tops (AUDIO)

Published: September 27th, 2013 at 1:12 am ET
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World Nuclear News, Sept. 26, 2013 (Emphasis Added): [...] Underwater inspections in the [Unit 4] pond have shown most of the fuel to be undamaged, but the pond contains a lot of dust and debris which will complicate operations. [...] Its full core load of fuel, plus used fuel from previous operation, was being stored in a fuel pool at the top of the reactor building. [...] The stability of the pool was then reduced by major structural damage to the building caused by the ignition of hydrogen [...]

World Nuclear News is funded by the World Nuclear Association. The WNA represents the interests of the international nuclear industry. -Source

Fairewinds Energy Education Podcast, Sept. 26, 2013 (at 21:15 in) – Arnie Gundersen, Fairewinds Chief Engineer: These racks [in the Unit 4 fuel pool] have moved, they’ve been distorted by the earthquake, there’s junk that’s fallen on top of them and distorted the tops. […] One of two things is going to happen. They’re either going to pull too hard and snap the bundle, or they’re going to be unable to pull all of the fuel out of the pool.

Full podcast available here

Published: September 27th, 2013 at 1:12 am ET
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14 comments to Nuclear Industry Report: ‘Reduced stability’ of fuel pool in Fukushima Unit 4; Admits there’s damaged fuel inside? — Gundersen: Fuel racks moved and damaged; Fallen debris distorted tops (AUDIO)

  • HoTaters HoTaters

    The best we can hope for, it seems, is for whomever moves the fuel to have the discernment to know which fuel to move (undamaged fuel) w/o disturbing the damaged fuel.

    Hopefully they'll come up with a strategy for dealing with whatever damaged fuel is left.

    Let's hope most of the fuel is still undamaged. Difficult to tell at this point.

    The thought of a criticality or accident occurring when they attempt to move the fuel is unthinkable.


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    • HoTaters HoTaters

      Here's the only good news on this front I've heard of in a long time (from Enformable):

      http://enformable.com/2013/09/japan-accept-help-france-fukushima-daiichi/

      "Japan to accept help from France at Fukushima Daiichi"


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    • corium pudding corium pudding

      On my monitor the word "discernment" looks like "discemment". No discemment! No disassemble! We are in trouble enough already!

      The written word is sometimes deceiving, not unlike TEPCO.


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    • nedlifromvermont

      Hey Ho! "unthinkable" you say … … the whole idea of a total melt-out was "unthinkable" much less three at one site … but it happened, and even a few prescient individuals thought about it and predicted it …

      In fact there was a movie about it "China Syndrome" which thought a lot about it, released right before TMI …

      Kind of like the experts and officials, like Condi Rice, who opined right after 9/11/01 that "no one could have imagined … use jet planes to fly into our buildings …"

      except that a lot of people had imagined, thought about and even predicted people using planes to fly into buildings … like the terror plot uncovered in the Philippines where the stooge-terrorists talked to their handlers about flying planes into buildings, or the Hollywood movie that had terrorists fly planes into buildings, which was pulled, late in its production, because it clearly showed a lot of people "imagining and predicting" just what the buck-toothed diplomat said people could "not have imagined" …

      When you hear a "leader" start something with "No one could have imagined …" prepare yourself to be about to hear a Whopper of a LIE!!!

      peace …


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  • PhilipUpNorth PhilipUpNorth

    Some damaged fuel assemblies have been compromized. Handling compromised fuel assemblies during removal procedures will inevitably spill fuel pellets onto the floor of the SFP. How long will it take for spilled fuel pellets to turn into a molten mass of melted fuel? What is TEPCO's Plan for Removing Spilled Fuel Pellets? Some of us ENEnewsers are a little worried that WHEN–not IF–fuel pellets are spilled from a broken fuel assembly, TEPCO workers will just stand around with no plan in place, wondering what they are going to do now.

    TEPCO:
    What is your plan for dealing with criticalities in spilled fuel pellets?
    How much time do you have for removal before spilled fuel pellets melt down?
    How long can a transfer cask resist a melt-through of molten fuel pellets?
    Can you even transport and handle a transfer cask containing fissioning melted fuel?
    How long can the floor of the SFP resist a melt-through of molten fuel pellets?
    Have you fitted the fuel handling crane with a bucket which can scoop spilled fuel pellets from the bottom of the SFP, dumping them into a cask for removal?
    Do you have a fuel pellet vacuum?
    Will you have on hand during fuel removal boron, lead, and other materials to mix with raw fuel pellets to stop fissioning?
    What specialized equipment will you have on hand at the CSFP to handle spilled fuel pellets when you open the transfer cask?
    I have not heard TEPCO address these issues.


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  • dka

    They can't remove the assembly bundles, but without touching them these bundles much, could they remove the pellets one by one?
    Forget the bundle for a moment, what we want in the end is to take the pellets out. Wouldn't that be easier?


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  • Heart of the Rose Heart of the Rose

    And when was the last underwater inspection..?
    Why would anyone believe..WNA..?

    "The World Nuclear Association (WNA) is the international organization that promotes nuclear power and supports the many companies that comprise the global nuclear industry. Its members come from all parts of the nuclear fuel cycle, including uranium mining, uranium conversion, uranium enrichment, nuclear fuel fabrication, plant manufacture, transport, and the disposition of used nuclear fuel as well as electricity generation itself [1].

    Together, WNA members are responsible for 95% of the world's nuclear power outside of the U.S. [2] as well as the vast majority of world uranium, conversion and enrichment production.[3]

    The WNA says it aims to fulfill a dual role for its members: Facilitating their interaction on technical, commercial and policy matters and promoting wider public understanding of nuclear technology. [4]"

    http://en.wikipedia.org/wiki/World_Nuclear_Association


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