Kyodo: Fukushima Daiichi reactors are “riddled with meltdown holes”

Published: April 24th, 2012 at 12:57 pm ET
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Title: Land water flooding reactors to be diverted
Source: Kyodo
Date: Apr. 24, 2012

[...] The Fukushima plant generates large volumes of highly radioactive water on a daily basis because it must perpetually cool melted fuel in reactors that are riddled with meltdown holes, as well as the spent-fuel pools sitting on top of them. Since the vessels are leaking, the water keeps the reactor buildings, turbine buildings and their basements flooded.

Some of this coolant water is recycled by reducing its radioactivity through a jury-rigged water-purifying facility set up once the crisis stabilized. But the tanks used to store the processed water could soon become full if they have to store groundwater as well. [...]

Read the report here

Published: April 24th, 2012 at 12:57 pm ET
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22 comments

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  2. Japan Times: Melted fuel burned holes in Fukushima reactors — Explosions cracked containment vessels? March 8, 2013
  3. *UPDATE* Mainichi: Reactors No. 1 and 2 have holes up to 50 square CENTImeters, analysis says — Biggest hurdle now is filling with water — “Caused by hydrogen explosions” — Half million pounds of highly radioactive fuel inside reactors 1-3 December 9, 2011
  4. Water pumping into three Fukushima Daiichi reactors stops after quake April 11, 2011
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22 comments to Kyodo: Fukushima Daiichi reactors are “riddled with meltdown holes”

  • kill the hacs kill the hacs

    Whats there storage capacity? 1000 tons/day being created! Halve the flow, can they 'de-contaminate 500 tons/day?. They have been cooling with pumped water since 311. Holes in vessels have been leaking since melt through shortly after. Conservatively we could extrapolate approximately 1 million tons of water has been released into Pacific since 311? Tepco is going to check it before releasing into ocean! Treatment isn't in there vocabulary anymore. A couple more years of releasing and ocean will be glowing. E


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  • StillJill StillJill

    I'm hearing, 'sieve',….is that about right?

    The TRUTH,…oh how 'she' does a FLOW!


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  • As bad as the situation is as a whole, I doubt there is a water purification system up to the task. I suspect they have been dumping water into the ocean all along. Didn't we read they put fuel rods into the ocean for "storage"?


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  • Sickputer

    Nice description of what we knew was happening long ago. It looks a little different having them admit the place is a global nightmare destroying habitat for lifeforms in the Pacific Ocean (which is interlinked to all other ocean bodies).

    Stock in fossil water is going way up in value…maybe also icebergs with their thousand year old drinkable water under the top layers.


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  • TheBigPicture TheBigPicture

    One nuclear plant is taking out the Pacific Ocean. And much more.


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  • Since 311, I have watched for any word on the control rods. In this design, I believe, the control rods are moved into place from the bottom of the vessel hydraulically (which seems like a really stupid idea). Surely the rods have some bearing on this situation. Can we assume they were vaporized?


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    • PhilipUpNorth philipupnorth

      Control rods in Reactors1,2,&3 melted down and became a part of the corium as they burned through and out of the buildings. The holes for the control rods, located on the bottom of the reactors, provided a convenient pathway for the coriums to exit the reactors, into the containment vessels. (This is a prime example of nuclear engineering at its worst.) :) Control rods in Unit4 had been removed from the Reactor4, and were stored in SFP4 on 311.


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  • cossack55

    Similar to the US goobermint…riddled with A-holes.


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  • Whoopie Whoopie

    F311WD
    Look at this video: it is very important!! a radioactive cloud hit Ibaraki and Chiba and Tokyo directly on March 15 and 21st. it's atmospheric simulation after having exploded. actually. It is thought that pollution at that time is important.
    http://www.youtube.com/watch?v=ni3HX9_lLtA&feature=related


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  • Since 311, I have watched for any word on the control rods. In this design, I believe, the control rods are moved into place from the bottom of the vessel hydraulically (which seems like a really stupid idea). Surely the rods have some bearing on this situation. Can we assume they were vaporized?

    guess the casing was made of zirconium which reacted to hydrogen and a salt in watervapor at 900 celsius


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  • AGreenRoad AGreenRoad

    Materials used

    Chemical elements with a sufficiently high capture cross section for neutrons include silver, indium and cadmium. Other elements that can be used include boron, cobalt, hafnium, dysprosium, gadolinium, samarium, erbium, and europium, or their alloys and compounds, e.g. high-boron steel, silver-indium-cadmium alloy, boron carbide, zirconium diboride, titanium diboride, hafnium diboride, gadolinium titanate, and dysprosium titanate. The choice of materials is influenced by the energy of neutrons in the reactor, their resistance to neutron-induced swelling, and the required mechanical and lifetime properties. The rods may have the form of stainless steel tubes filled with neutron absorbing pellets or powder. The swelling of the material in the neutron flux can cause deformation of the rod, leading to its premature replacement. The burn up of the absorbing isotopes is another limiting lifetime factor.

    Silver-indium-cadmium alloys, generally 80% Ag, 15% In, and 5% Cd, are a common control rod material for pressurized water reactors. The somewhat different energy absorption regions of the materials make the alloy an excellent neutron absorber. It has good mechanical strength and can be easily fabricated. It has to be encased in stainless steel to prevent corrosion in hot water.

    Boron is another common neutron absorber. Due to different cross sections of 10B and 11B, boron containing materials enriched in 10B by isotopic separation are frequently used.


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  • AGreenRoad AGreenRoad

    Boron carbide is used as a control rod material in both pressurized water reactors and boiling water reactors.

    Hafnium has excellent properties for reactors using water for both moderation and cooling. It has good mechanical strength, can be easily fabricated, and is resistant to corrosion in hot water. [1] Hafnium can be alloyed with small amounts of other elements; e.g. tin and oxygen to increase tensile and creep strength, iron, chromium and niobium for corrosion resistance, and molybdenum for wear resistance, hardness, and machineability. Some such alloys are designated as Hafaloy, Hafaloy-M, Hafaloy-N, and Hafaloy-NM.[2] Its high cost and low availability limit its use in civilian reactors, though it is used in some US Navy reactors.

    Dysprosium titanate is a new material currently undergoing evaluation for pressurized water control rods. Dysprosium titanate is a promising replacement for Ag-In-Cd alloys because it has a much higher melting point, does not tend to react with cladding materials, is easy to produce, does not produce radioactive waste, does not swell, and does not outgas. It was developed in Russia, and is recommended by some for VVER and RBMK reactors.[3]

    Hafnium diboride is another such new material. It can be used standalone or prepared in a sintered mixture of hafnium and boron carbide powders.[4]

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


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  • AGreenRoad AGreenRoad

    This explains why they are finding radioactive silver out in the ocean, on the ground, in spiders, etc.


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  • bigfatscaryman sdyogini

    I said it before, I will say it again….SHIT!


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