Japan Earthquake | Page 1233

  • @Edano OK, but as you can see from the schematics of the reactors at Fukushima pinned up on this page, the breach of the RPV doesn't lead to the molten fuel to go directly into the ground. After the RPV there's a steel containment vessel, after that a steel reinforced concrete primary containment and after that the secondary containment whose basement is still filled with water, according to TEPCO. If that water hasn't drained from the basement it is highly unlikely that the molten fuel has. So lets wait for more evidence before we raise the China Syndrome red flag and start passing petitions around to evacuate the 26 million people living in Tokyo and so on. What we need to know right now is how much water is in that basement and how much has infiltrated the sediments.
    by Pedro Jesus 5/17/2011 4:45:44 PM

  • @Lethbridgean : i remember how Oettinger (EU official) was attacked when he leaked information and made assumptions.
    by Edano 5/17/2011 4:46:01 PM

  • @all Can anyone make sense of this statement from that Time blog below: "current temperature readings suggest that fission inside the reactor core has definitely ceased for good"? If the fuel has all melted to (or through) the bottom of the RPV, what good are their temperature readings? ecocentric.blogs.time.com
    by jay 5/17/2011 4:46:11 PM

  • @Optim You mean #1, #2 and #3. There can't be any meltdown at #4 because there is no fuel inside the reactor. The ramifications could get extremely bad if the molten fuel does infiltrate the ground. Worse case scenario, which is still possible, is very, very serious.
    by Pedro Jesus 5/17/2011 4:47:27 PM

  • @radioguy At the very first day, I was trying to get across to the blog 'experts' that the plant was wrecked- generator fuel wiht water in it, pipes ruptured, mud in everything- hell, the very tools were washed away!
    by marie rich 5/17/2011 4:48:40 PM

  • @Pedro Jesus Do we know the water capacity of the basement? I'm not convinced that the water isn't leaking below the basement into the water table and who's to say Corium hasn't played a role at some level. We just don't know for sure.
    by LM 5/17/2011 4:49:04 PM

  • @LM Time is against us all. Reactions will continue and the molten fuel will keep corroding through unless it is cooled down enough. I don't think we have specs about the capacity of the basement and I'm sure there is still no estimate of the amount of water there. We need more data. Like you said, we don't know... yet!
    by Pedro Jesus 5/17/2011 4:51:01 PM

  • @jay I was wondering the same thing?
    by LM 5/17/2011 4:52:06 PM

  • news from germany: a today published official "stress test" revealed that none of the german npps would resist a plane crash. some of them not even a small cessna crash. for decades they have keep telling us that they were safe. oh well. i am sure, if german's npps fail, all the others in the worls are no better.
    by Edano 5/17/2011 4:52:34 PM

  • @Pedro Jesus - all you need for a meltdown is uncooled nuclear fuel rods, and in SPF #4 there is certainly enough of those
    by Lethbridgean 5/17/2011 4:54:41 PM

  • @Pedro Jesus I'm not arguing with you..I just don't believe it's fair to shut down valid hypotheses simply because we don't have enough info. We don't have enough info to assume the glass is half full either. My 2 cents.
    by LM 5/17/2011 4:54:41 PM

  • @LM I'm not arguing either, in fact we share very much the same opinion. =)
    by Pedro Jesus 5/17/2011 4:56:47 PM

  • @Pedro you say "very, very serious"but what does that mean exactly ?
    by DT 5/17/2011 4:56:52 PM

  • @salu are you still there?
    by elainekirk 5/17/2011 4:57:24 PM

  • It looks like salu went I was going to suggest we discussed the link on the other page, such a shame that we didnt engage it must be very worrying for him/her
    by elainekirk 5/17/2011 5:00:27 PM

  • As I recall, With melt down it becomes impossible/ very difficult to cool the corium (sp) that forms because it is so thick and even if you cool the outer surface area, the center continues to generate heat through fission reactions. then this corium can melt through the steel if it is contained in the steel still. R#4 could melt down and through more easily because it only has concrete around it, and even easier if it falls over and spills into the ground.
    by carabnr 5/17/2011 5:00:57 PM

  • @all @salu is on the other page if anyone wants to discuss those horrenous figures
    www.scribblelive.com
    by elainekirk 5/17/2011 5:03:05 PM

  • @LM No kidding. If I have a fever, I tend to measure it by putting the thermometer in my mouth, not near it...
    Whatever temperature gauges they are using, safe to say they were probably designed to be underwater and are now in dry air. Furthermore, they are now meters above where the actual fuel/corium is located. If the hottest part of the fuel is now outside the RPV, I'd think the temperature guage in the RPV would be pretty useless as a metric of anything, let alone whether the corium is still melting...
    by jay 5/17/2011 5:04:24 PM

  • Greetings Lethbridgean: I agree - TEPCo's SFP in R#4 at Fukushima Daiichi is for all intensive purposes perhaps the most critical and dangerous aspect to the failure of the entire NPP. The SFP is not designed to store the amount of Fuel it contains due to the maintenance work taking place in the core for long periods of time, perhaps not all the Fuel in the SFP is actually spent? Anyway I think there is much more happening in R#4 than meets the eye. Are SFP's designed to contain a meltdown in the same way a containment vessel supposedly provides protection from a core meltdown, I don't think so . . . but I'm not a Nuclear Physicists so what the heck do I know ;)
    by Tenzing 5/17/2011 5:04:59 PM

  • @Pedro Jesus : the "secondary containment" is a joke. it is the outer hull of the building. it obviously doesn't need much to destroy it.
    by Edano 5/17/2011 5:06:58 PM

  • @Edano A bad joke then.
    by Pedro Jesus 5/17/2011 5:08:05 PM

  • Gov't panel to decide compensation for nuclear crisis by ranking mental distress
    mdn.mainichi.jp
    "The panel will evaluate mental distress suffered by residents near the crippled plant, who are being forced to live in evacuation shelters, temporary housing, hotels and other facilities, from a viewpoint of their living environment, convenience and how far their privacy is maintained.
    Specifically, the panel will rank those living at public facilities such as gymnasiums and community centers at the top of the list in terms of mental distress. Evacuees living at temporary housing, apartments and relatives or acquaintances' homes will be ranked second, and those staying at hotels will be third while those staying indoors at their own homes will be fourth. It will calculate the amounts of compensation based on the rankings."
    by Reed edited by elainekirk 5/17/2011 5:10:38 PM

  • Concerning #1 basement water, "On Saturday, nuclear officials said they had found more than 12 feet of water in the basement of Reactor No. 1. " www.nytimes.com Not sure what that equates to in cubic meters.
    by Markfm 5/17/2011 5:16:08 PM

  • @jay I agree..after what we've learned I hardly think we can rely on gauge readings...unfortunately. Water leak discoveries in some way offer a timeline to corium breach of RPV and the leaks have been there for a long while...I have a hard time feeling the glass is half full with this one.
    by LM 5/17/2011 5:16:27 PM

  • @Pedro Jesus : what do you mean with "water in basement" ? the torus ? the corium will not take the long way to the torus. it will just vertically melt down thru the lightbulb bottom. www.houseoffoust.com

    by Edano via Houseoffoust 5/17/2011 5:18:36 PM

  • @Edano According to TEPCO there are leaks at some of the torus pumps, apart from the breach at the bottom of the RPV. Most of the water they injected has leaked to the basement of the secondary containment building. That diagram does not show the whole unit, only a small part around the reactor where you can see the RPV and the suppression chamber underneath, but not the rest of the structure around the reactor including the two last levels of protection. See the schematics I posted yesterday that are pinned up. They give you a better perspective of the whole unit.
    by Pedro Jesus 5/17/2011 5:26:46 PM

  • <div style="width:425px" id="__ss_7859936"> <strong style="display:block;margin:12px 0 4px">Fukushima Marine Environment Monitoring - 5 May 2011 <iframe src="http://www.slideshare.net/slideshow/embed_code/7859936" width="425" height="355" frameborder="0" marginwidth="0" marginheight="0" scrolling="no"></iframe> <div style="padding:5px 0 12px"> View more presentations from IAEA </div> </div>
    by Reed 5/17/2011 5:27:45 PM

  • @Pedro Jesus : maybe we should concentrate om these structures. do we have diagrams ?
    by Edano 5/17/2011 5:28:16 PM

  • @edano can you help @reed out please :)
    by elainekirk 5/17/2011 5:28:19 PM

  • Reed, want me to kill that last post, you can redo it? Just plug in the normal URLs, perhaps?
    by Markfm 5/17/2011 5:29:09 PM

  • @Edano Good point. It seems reasonable to me that the gob of corium would be melting straight down, while the water being dumped on it would run over the top of the corium and down to the basement through the piping/torus breaches, since the top of the corium itself would be blocking the path downward. It doesn't sound like corium penetrating through the concrete basemat and water pooling in the basement are mutually exclusive.
    by jay 5/17/2011 5:30:01 PM

  • @Edano @elainekirk @Markfm If someone can embed the link I'd appreciate it. TY
    by Reed 5/17/2011 5:30:34 PM

  • Fukushima Marine Environment Monitoring, 5 May 2011: www.slideshare.net
    by Markfm edited by Markfm 5/17/2011 5:31:09 PM

  • Lotsa' new images posted by TEPCO (I'm uploading the video to YouTube now.):
    Reactor buildings of Unit 1 and 2
    Truck with nitrogen supply equipment
    Car swept up by Tsunami
    Removal of rubble by an unmanned heavy machinery
    Crawler dump truck for spraying dust inhibitor
    Spraying dust inhibitor by a crawler dump truck
    Water spray to the spent fuel pool of Unit 4 by a concrete pumping vehicle
    Temporary substation for Unit 1 and 2
    Concrete placement to the vertical shaft of Unit 2 (1)
    Concrete placement to the vertical shaft of Unit 2 (2)
    Dust inhibitor sprayed around the circulating water pump of Unit 3
    Cable trench pit for the water intake of Unit 2
    Screen room of Unit 2
    Steel sheet piles at the water intake of Unit 2
    Silt fence installed around the water intake of Unit 2
    Temporary motor driven pump for water injection to the reactors of Unit1 to 3
    Heavy oil tank swept up by Tsunami
    Suppression pool's water surge-tank near Unit 5 and 6
    Ultrahigh voltage switching station of Unit 5 and 6
    Temporary tank installed near Unit 5 and 6 (1)
    Temporary tank installed near Unit 5 and 6 (2)
    Building for diesel generator 6B of Unit 6
    Rubble container
    Transfer of container
    Administration Office Building (exterior)
    Administration Office Building (interior 1)
    Administration Office Building (interior 2)
    1st floor of the turbine building of Unit 1(1)
    1st floor of the turbine building of Unit 1(2)
    Local exhauster installed in the turbine building of Unit 1
    Positive pressure room installed at the turbine building of Unit 1
    Entrance of Main Anti-Earthquake Building(A prefabricated house used for access control)
    Measurement of radioactivity in Main Anti-Earthquake Building
    Spare protective equipments(1)
    Spare protective equipments(2)
    Entrance of Main Anti-Earthquake Building(from inside)
    Emergency headquarters
    Water supply area of Main Anti-Earthquake Building
    Passing forward daily commodities in Main Anti-Earthquake Building
    Encouraging messages posted on the walls of Main Anti-Earthquake Building
    www.tepco.co.jp
    by Rob in SF 5/17/2011 5:34:22 PM

  • by Rob in SF via Tepco.co.jp 5/17/2011 5:36:49 PM

  • @all Radioactive water was found in all turbine buildings and tunnels between 3/25 and 3/28. It was quite probably leaking before then. If a full meltdown at 1 occurred on 3/14 it's probably safe to assume the same for 2 and 3 and that seems to be a long time for low water readings in all 3 (not to mention they could have been dry the whole time)...the Corium has had a lot of time to do it's magic.
    by LM 5/17/2011 5:36:56 PM

  • @Rob in SF, strange no hires images of unit #4, also no closeup images of damage seen by TBS cam..
    by WolfDK 5/17/2011 5:48:20 PM

  • @LM Do we know what the water levels of #2 and #3 are? Last time I checked they had no readings because they suspected the gauges there were not calibrated like at #1. At this point I predict the situation at #2 and #3 is most likely the same as in #1 give or take some minor details. They were supposed to enter unit 2 today to carry out the same check-ups as in #1 and repair some pumps and gauges.
    by Pedro Jesus 5/17/2011 5:49:36 PM

  • @WolfDK Though posted today, the images are a bit dated, seemingly all from May 6th per the webpage.
    by Rob in SF 5/17/2011 5:51:44 PM

  • greetings to all
    by dean 5/17/2011 5:51:52 PM

  • @dean greetings
    by WolfDK 5/17/2011 5:52:27 PM

  • nancy are you there
    by dean 5/17/2011 5:53:01 PM

  • @Rob in SF, i noticed that too thanks for posting the link
    by WolfDK 5/17/2011 5:53:01 PM

  • by Rob in SF via Tepco.co.jp 5/17/2011 5:54:44 PM

  • @Pedro Jesus No..we don't know levels yet for 2 and 3. Just speculating based upon amount of water leakage into basements etc..not to mention GoJ now suspects the same. Hopefully we'll know more today.
    by LM 5/17/2011 5:56:13 PM

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