Gundersen’s Kansai Presentation: Pellets of nuclear fuel were scattered around Fukushima site — Pieces, not atoms, but pieces — Hydrogen will not create explosion seen at Unit No. 3 (VIDEO)

Published: May 13th, 2012 at 9:11 am ET


Fukushima Daiichi: The Truth and the Future
Fairewinds Energy Education
May 12, 2012

As part of a presentation in Kansai, Japan on May 12th 2012, Maggie and Arnie Gundersen of Fairewinds Energy Education answered specific questions asked by symposium organizers regarding the condition of the spent fuel pool at Fukushima Daiichi Unit 4. Fairewinds analyzes the explosion at Fukushima Daiichi Unit 3. Also, Arnie discusses what the future may hold for Japan if it chooses a path without nuclear power.

At 8:00 – 16:00 in

  • A prompt criticality at Unit No. 3
  • No. 3 explosion ‘entirely different’ than No. 1
  • Containment cannot handle detonation
  • Hydrogen/pressure will not create detonation
  • Pieces of fuel, not atoms, but pieces
  • Something had to lift the nuclear fuel up
  • Pellets wound up scattered around the site

Published: May 13th, 2012 at 9:11 am ET


Related Posts

  1. Gundersen: Major problem inside pool at Fukushima Unit 3 — Pieces of nuclear fuel rods were blown out during criticality explosion — Building could ‘shatter’ if another big quake hits (VIDEO) October 5, 2013
  2. Symposium Q&A: Explosion at Fukushima Unit 3 drove nuclear fuel out of storage pool — Scattered up to 2 miles away (VIDEO) March 27, 2013
  3. Gundersen: Unit 3 explosion “very similar” to what happened at Chernobyl — Pieces of nuclear fuel found offsite indicate fuel racks were lifted up (VIDEO) August 4, 2012
  4. Reactor Specialist on Unit 3: “I can’t tell you if it’s a hydrogen explosion or a nuclear explosion” (VIDEO) August 24, 2012
  5. Tepco Official on Unit 3: “We don’t know if it was really a hydrogen explosion” August 8, 2012

21 comments to Gundersen’s Kansai Presentation: Pellets of nuclear fuel were scattered around Fukushima site — Pieces, not atoms, but pieces — Hydrogen will not create explosion seen at Unit No. 3 (VIDEO)

  • hbjon hbjon

    A hydrogen bomb afaik does not require a CM. Two 3H atoms can fuse into a He atom. Then that atom will decay into a lithium atom. The lithium atom will oxydize into a black substance. The trigger for such a reaction would require the heat of fission afaik. Where did the H3 come from? 2H+N=3H. However, much of the energy would be absorbed into a dirty H bomb afaik. The yield would be less than that used in weopons. Good morning all and may God bless us all. Amen.

    • BreadAndButter BreadAndButter

      hbjon, good morning. What does "afaik" mean??

    • Plan Nine

      Cmiiw, hbjon, but I believe you are referring to hydrogen fusion as in H-bombs and the Sun. FUKU disaster involves a debatable combination of conventional hydrogen combustion and nuclear fission.

      • hbjon hbjon

        And on what prefuku experiments are you basing these conclusions? It's not an everday occurance that we see sfp's explode. I don't think (afaik) it's ever been tried before. Don't you first have to get radiated spent fuel from many decades of use, then cover it with heavy water, then drain the water, then turn on the cameras and see what happens?

        • I'm with you. We may be seeing chemistry never seen before.

          • hbjon hbjon

            In any case, the unthinkable happened and that also means that it is unspeakable. What we will soon discover is the mobility of all these fuel biproducts and alpha emitters. Thank goodness there's not a debris field or air current that could transport it to North America. Wait…ummm…How bout those Yankees?

    • harengus_acidophilus

      What is this?

      "Two 3H atoms can fuse into a He atom. Then that atom will decay into a lithium atom. The lithium atom will oxydize into a black substance. "

      3He (Z=2)will DECAY to 6Li (Z=3)or 7Li ???

      Interesting mind.


      • hbjon hbjon

        I don't think it's too far-fetched. All the necessary ingredients are there. Just need some fission (which they said happened, how could it not have) to disrupt and weaken the nuclear forces. Another unknown is the pressure trying to squeeze the gases together. Pressure cookers have been known to explode.

  • Another first el (if you're here) for Arnie:

    localized boiling in spent fuel pools can occur at temperatures below 100 C – causing the pool to explode. That is, even though the entire pool is safely below 100 C, another small part of the pool can cause an explosion. They have never designed for this. (The pools must be cooled for another two years).

    If the pool loses water in an earthquake, there will be insufficient cooling, the pool will burn and Tokyo will have to evacuate and Japan cut in half.

    We sit here like dumb apes hoping that a force 7 EQ doesn't happen in an active earthquake zone that is still expecting aftershocks from a force 9.

    Also, note the first few frames of the video showing exactly where SFP4 is located (the south-facing wall?).

    Finally, do we have a visual yet on SFP4? Anyone actually seen it on video or photo? Did they paint it black?

    Paint it Black – The Rolling Stones

  • weeman

    I believe it was a implosion at unit 4 not explosion , walls and roof pulled in, different kind of detonation from other units, reports of inside of unit walls melted, something caused a vacuum.
    Unit had no fuel in reactor so detonation either was from fuel pool or from other reactor through connections to building, unlikely .
    Anybody agree or have any ideas, hydrogen suspended in spent fuel pool, earthquake vibrated fuel causing criticality , low water in pool caused top of fuel bundles to beexposed to air

    All scientist and PhDs in nuclear industry in world should be conscripted into the nuclear army to fix this, these are the people who got us in this situation, they should become outcaststo society, we should make their lives hell untill they volunteer, publish their names and addresses, people gather outside their homes, work, it is time for civil disobgence converge on nuclear facilities and close them down.

  • jackassrig

    We have this in pressure vessels. If the vessel is full of say steam and all of a sudden the vessel goes cold then the steam will condense and if the vessel is not built for full vacuum an implosion can occur. I don't know for the life me know how a vacuum could occur at Unit 4 since the buildings were before the explosion pretty drafty. Everything concerning Fuku has been strange though. It might have happened.

  • getoutwhileyoustillcan

    I'm not saying I think this is what happened (because I don't think this is what happened), but another possibility is sabotage.

  • forget anything with vacuum there.
    when the produced water in a H2 esplosion condenses it may look like an implosion for a second.
    and the explosion of H2/O2 has a special feature, dynamite for example produces per volumeunit lets say 20 volume units gas.
    3 volume units ignitable H2 O2 give 2 volume units watervapor. The water vapor needs more volume due to reaction energy but it condenses fast.
    that makes a pure Hydrogenexplosion unique

  • mark_eric

    Didn't people say that the wall of one or more reactors at Daini looked "sucked in"? This struck me as odd at the time. Can anyone think of an "implosion-like" event that could happen to reactors or SFPs? Maybe we're seeing the results of a new or undocumented phenomena.

    • getoutwhileyoustillcan

      I have a theory. What if an extremely hot molten core melted through the reactor, causing the temperature to fall dramatically inside the reactor, causing the air (or whatever's in one of those things) to contract? Could this cause a violent implosion? Just think about what happens if you take an inflated balloon outside on a cold day. It immediately gets smaller. But a reactor isn't flexible like a balloon. So if the heat source disappears (melts out the bottom on its way to China), and the pressure can't equalize (maybe there's no vent, it's broke, or someone just turned it off?), the thing could collapse sort of like a balloon. And the difference in temperature could be pretty dramatic, considering how hot those molten cores can get.

      • getoutwhileyoustillcan

        Oops, hit the wrong button and reported my own comment 🙂

      • getoutwhileyoustillcan

        So does this mean the reactors at Daini melted through too. I can't keep track of all these disasters. Do we already know that the ones at Daini melted through, or are we supposed to hear about that one later when we run out of other bad news?

        • weeman

          Daini has been damaged and will take 5 years to fix, never restart.
          They do not want us to know that the earthquake caused significant damage and the reactors did not stand up to the forces they were designed for either by bad engineering or age of reactors.
          Also this would cause all mark 1 and 2 reactors to be shut down around the world, what are they waiting on these are machines of death that has the potential to kill us all.
          Money is the root of all evil and these people are evil

      • weeman

        Unfortunately unit 4 had its nuclear fuel removed for maintenance so this is not the answer
        They say that the SPF was on fire for days after implosion or explosion
        Do you not need oxygen to propagate explosion, if spent fuel pool instantaneously ignited would that not cause a in rush of oxygen to building to feed explosion or implosion