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Fukushima: its effects on Japan & the global risks posed by the No. 4 reactor (Gundersen/Caldicott)
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[quote:Anonymous Coward 20898205:MV8xOTQwMjY3XzMyNTA4NTY3X0RGMjAyNTg0] [quote:Anonymous Coward 14263456:MV8xODMzMjE4XzMwNTgyMzY3X0FBMzNCMDUy] Chris Martenson: Right and so you mentioned Unit 4 then, also being at risk for this. I thought that unit four, the core was out and that they have some water back in the pool. What is the concern with unit four at this point? Arnie Gundersen: You are absolutely right and there is no reactor running there. Everything has been taken out and it was put in the spent fuel pool. But that means there is no containment either, so the entire spent fuel pool is visible literally. When they have those helicopter fly-overs, you can look down into this blown out shell of a building and see the fuel in the spent fuel pool. It's still relatively hot, because it only shut down in November. So there is still a lot of decay hear in that pool. Brookhaven National Labs did a study in 1997 and it said that if a fuel pool went dry and caught on fire, it could cause a hundred and eighty-seven thousand fatalities. So it's a big concern and probably the biggest concern. I now the Chairman of the NRC said that the reason he told Americans to get out from fifty miles out was that he was afraid that Unit 4 would catch fire, that exposed fuel pool would volatilize plutonium, uranium, cesium, and strontium. And if the Brookhaven Study is to be believed could kill more than a hundred thousand people, as a result. Chris Martenson: So talk about — realistically – I mean this is going to be months, years, whatever, it’s going to take a long time. What do they do at this point, are they going to entomb these things, are they required to just keep dumping water on these things until they finally cool down, capturing water all the way through? Or is there some way that they can maybe just throw up their hands and just pour a bunch of concrete on it and call it a day? Arnie Gundersen: I think eventually they may get to the point of throwing up their hands and pouring the concrete on. They can’t do that yet, because the cores are still too hot. So we are going to see the dance we’re in for another year or so, until the cores cool down. At that point, there’s not anywhere near as much decay heat and you probably could consider filling them with concrete and just letting sit there, like we have it at Chernobyl, as a giant mausoleum. That would work for units 1, 2, and 3. Unit 4 is still a problem, because again all the fuel is at the top and you can’t put the concrete at the top because you will collapse the building and it’s so radioactive, you can’t lift the nuclear fuel out. I used to do this as a living and Unit 4 has me stumped. http://www.fairewinds.com/content/gundersen-speaks-chris-martenson-current-status-fukushima-part-i [/quote] [/quote]
Original Message
This week, Dr. Caldicott has a new conversation with nuclear engineer Arnold Gundersen about the ongoing nuclear disaster at the Fukushima plant and its effects on Japan and the rest of the world. [...]
At ~15:00 in
Arnold Gundersen, Nuclear Engineer: All the reactors have plutonium in them… Uranium-238 becomes plutonium-239 when it absorbs a neutron… There was close to a ton of plutonium in each of the reactors… scattered throughout the fuel… A ton of plutonium in each reactor… You and I know how dangerous plutonium can be… makes the cleanup that much more difficult.
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