Highest Yet: 412 sieverts/hr in Reactor No. 1 dry well — Japan says ‘defective meter’

Published: August 18th, 2011 at 11:01 am ET


Radiation dose, Unit 1 nuclear power plant Hukushima, atmc.jp, August 18, 2011:

h/t Anonymous tip, Jon_NY

Published: August 18th, 2011 at 11:01 am ET


Related Posts

  1. Highest Yet: 512 Sv/hr at Reactor No. 1 — Still reads ‘defective meter’ (CHART) September 30, 2011
  2. Reactor No. 1 dry well meter hits new high at 266 Sv/hour — Japan says ‘defective’ July 6, 2011
  3. Highest radiation dose yet at Reactor No. 1 — 204 Sieverts per hour in drywell May 25, 2011
  4. Highest Yet: Radiation inside Reactor No. 1 drywell rises to 250 Sieverts per hour June 4, 2011
  5. Off the Chart: 225 Sieverts per hour at Reactor No. 1 — Highest radiation dose yet measured May 30, 2011

85 comments to Highest Yet: 412 sieverts/hr in Reactor No. 1 dry well — Japan says ‘defective meter’

  • Whoopie Whoopie

    OMG! Look at that CHART!! Evacuate Japan! TODAY!!

  • Steven Steven

    If they think the meter is defective then replace it. Maybe they’re not certain enough to send anyone in there. So, should say ‘possibly defective’.

  • News soon…

    πŸ˜‰ 48-72 hours. Data dump. Big developments…

  • Rosie

    Ah…..excellent. I’m looking forward to reading it.

  • maaa

    Could be slow release of data. Maybe its actually 2000sv now.

  • I can’t wait to read it. This is the place to read. If only more would read here.

  • arclight arclight

    doesnt make sense that the gauge steadily increases its readout like that i think….but will have to wait another month or two to fibd out that they are going to replace the valve and maybee a coupla weeks later that theve fitted them etc etc

    • Whoopie Whoopie

      Their obviously lying. Like a poster said, someone prob GOOFED and posted it by mistake, dont you think?

      • Whoopie Whoopie

        BBL Keep up the great work guys!

      • Misitu

        atmc.jp is to my recollection a private individual’s site where the tepco figures, difficult to interprete in raw form, have kindly been given a useful shape.

        These charts seem to have gone missing for a while but are heartily welcomed back.

    • Misitu

      Don’t forget that as the compiler says the dots represent the absolute maximum readings for any given day. What happens in between is not shown.

      It’s Rough but Ready.

  • http://pissinontheroses.blogspot.com/
    TUESDAY, AUGUST 16, 2011

    Fukushima’s Radioactive Ocean Contamination Has Already Hit California
    Thanks to a tip, I was directed to the following abstract from the
    Proceedings of the National Academy of Sciences

    Evidence of neutron leakage at the Fukushima nuclear plant from measurements of radioactive 35S in California

    The abstract shows that radioactive sulfur off-gassing from the SURFACE of the Pacific Ocean around Fukushima reached coastal La Jolla, California on March 28, 2011. Their calculations indicate that roughly 1% of the Fukushima radioactive contamination rapidly reached La Jolla; and that seems to be the focus of their analysis.

    Not having yet seen the full paper, I suspect it will be easy to blow holes in their transport model and calculations. HOWEVER, that possibility pales in comparison to their actual detection indicating that SURFACE LEVEL radioactive contamination of the Pacific ocean was rapidly transported several thousand miles to California.

    That information is EXCEEDINGLY concerning given the large amount of radioactive materials are still spewing into the ocean from Fukushima. The data portends the rapid uptake and spread of radioactivity into both the aquatic and avian food chains.

    Improved environmental risk data may be achievable by using the study’s data to extrapolate ocean/atmosphere boundary layer radioactivity spread across known fishing and migration routes. The resulting data would provide location data to sample plankton uptake of radioactive sulfur, and as a result possibly confirm the study’s back calculations of neutron leakage at Fukushima.

    TUESDAY, AUGUST 16, 2011

    Radioactive Acid Rain !!!
    The discovery AND ANALYTICAL REPORTING of radioactive Sulfur 35 emanating from the ocean surface at Fukushima and transporting to California has restored some faith in scientific due diligence. I can well imagine that the University of California Berkeley’s Nuclear Engineering Departments BRAWN team would have dismissed the detections as “NATURAL”; it would have been another case of ALL BRAWM and NO BRAINS
    Hence, the authors of the study deserve some praise for giving scientific-due-diligence something more than just dismissive lip service.

    Having had some more time to go over the abstract and supporting documentation, it is not so clear if the author’s models compensated for the washout of the radioactive Sulfur as acid rain H2SO4; it also does not appear as if the author’s tested rainfall for the presence of RADIOACTIVE SULFURIC ACID RAIN.

    The ocean surface off-gassing of radioactive compounds and their subsequent redeposition via rainfall may be a modality of rapid hopscotching of water born radioactive contamination across the Pacific. It could also preclude the claims of ‘no worries’ some have made of the detections; getting caught in such a Radioactive Acid Rain Fall may be much less than safe.
    POSTED BY MS. X AT 2:29 PM

  • DannieJ DannieJ

    I work with highly sensitive industrial laser cutters. Many sensors and meters are involved. I have never heard of or experienced a sensor or meter that worked sporadically or measured high outputs where none was present.

    Volt meters, air pressure readers, power calbration devices, cooling sensors, reflector sensors, even mechanical sensors and basic light safety devices … Never have I heard of one working when it didn’t work.

    It seems like an oxymoron to me.

  • arclight arclight

    `mind you! there seems to be more reactions recently 1 to 4 day interval, extreme and sort of regular….corium splitting/hitting water anyone??

  • Pallas89juno Pallas89juno@yahoo.com

    Dear ENE’ers: As you can see from the graph above, the R1 corium here continues to spontaneously self re-set itself to produce neutron cascades with completely uncontrolled prompt/spontaneous criticality, maybe near “super-criticality” being reached. I believe this data, if the instrument is not broken (right!), shows the real possibility or likelihood of coming nuclear explosion at least with this corium, which appears to be in a stable mass and shape, such that it continues to self-induce neutron cascade criticality (fissioning) that is producing higher and higher levels of radioactivity. If the shape and mass of the corium are not altered, it will become more and more radioactive and the danger of nuclear explosion will increase for many many thousands of years. The trend is onward and upward. Someone several weeks ago had said that this chart chowed Sv/hr. contamination.

    In my head, as an example of minimization where self enforced, I had replied to that individual, “wasn’t that millisieverts? [for the above R1 chart]”; but I was very wrong and had deluded myself. The drywell in R1 is showing multi-3-digit levels of Sieverts!

    The very lowest numbers in the above graph would be more than enough to put most humans into an instant coma with death 100% certain in 100% of cases, within hours to a day or two. The unlucky would linger for several hours longer. The higher Sv numbers here would kill, and perhaps disintegrate a human’s tissues instantaneously to a kind of pulpy mash. The higher levels of radiation shown on this graph are definitely working to quickly warp, twist, disambiguate, and generally alter the metals and other construction materials “containing” above this very stable-SHAPE and stable-MASS of corium. I suspect that the construction, should it ever occur, of the plastic bag structure to obscure unit one is meant to keep anyone from seeing the building fall apart, as one likely purpose, since it will.

    • Plausible indeed. We are also expecting a major quake in this region(Pacific Ring of Fire) at this time. The combination could become disastrous referring to RE Webb’s scenario of losing all cooling and the event spreading to all of Japan. Scary indeed.

    • Pallas89juno Pallas89juno

      When a corium is in such a stable shape and mass, it’s center or areas away from the crust on the outside of the very molten mass, where the neutron cascades are occurring and continue to reset themselves, are not effected as reported (thermal cooling is keeping it all under control if we were to believe TEPCO) by external attempts at cooling or by attempts at external chemical inhibition of neutron cascade. There is some porosity in corium (study Chernobyl); but when the corium is in the correct thick shape and large enough mass, this external application of thermal cooling or neutron inhibition will have nominal to no effect whatsoever on internal fissioning and re-fissioning (criticality and re-criticality, all the way eventually to super-criticality and another nuclear explosion.). Every time criticality occurs, Plutonium is produced, which helps keep everything going/fissioning and makes it more likely that surrounding H20 in the environment of the corium helps keep everything HOTTER, not thermally colder. Plutonium gets hot in the presence of air, oxygen, or water. This increasing percentage, not sure precisely how much as the mix in the corium is quite complex now, means that less inhibition of radioactive decay becomes possible even on the exterior of the fissioning molten mass. With the above radiation figures, you can be 100% assured that the mass here, UNLIKE Chernobyl, remains a large, active and dangerously reactive, molten corium “lava”.

  • alasanon

    So, millions of Japanese will be dying at a clipped pace. Any half sensible person would have gotten out, jumped a bullet train, packed themselves in a cargo ship, or even rowed a boat to safety by now.

    We warned them. But, anyone who grew up in the only country hit by atomic bombs, next door to the only country that produced the devastation of one (1) nuke meltdown at Chernobyl should have been able to divine a clue without any interference by the government.

    I guess they just want to get cancer and die. They really, really want that. We can’t stop them from wanting it this badly! It’s sad though that they hate their children this much!!

    Apparently, the same shall apply to the U.S. to a much lesser extent. (sigh!!)

    • alasanon

      I actually feel the same irritation I felt toward people on the Gulf coast who decided they must go swimming in the Gulf Oil spill last year. They were covered in orange stuff-? Some of them died…all are ill or disabled… It’s sad, but DUHHHH! C’mon, people. Who cares what the govt. tells you. It’s Maddening!!!

    • DannieJ DannieJ

      It’s called denial.

      It’s and extremely powerful defense mechanism, especially when reinforced by outside sources and ones own wishful thinking. Denial is what enables and alcoholic to literally poison himself on a daily basis and call it good times.

      Anyone still within 200 km of this clusterfuck is in denial, but this poison will not sober off and any moments of clarity will be truly horrifying and much too late to act upon.

      • Misinformation and obfuscation of inf. along with human ability to sort and truths from falsehoods people just give up even trying to keep up while the daily struggles of life with family and making a living, Recall the GOM and how people went back to pre-spill when things seemed to being worked on and in time no news but lives were still being effected heath and economically !

        The powers that be know how to manipulate and before long, much of the world goes back to normal, unaware of any connection to what transpired before !(see the news lately from around the world) Locals will be reminded abruptly and brutally with a wakeup call !

  • BreadAndButter BreadAndButter

    Hi all, I find it interesting that that graph had STOPPED on 8/3. There was no new data added on the atmc.jp page after that, I’ve checked almost daily. And now, all of a sudden, it’s all there! Strange.

  • SimplyInfo

    Those numbers are correct. The highest was 416 right after the last 6.2 quakes on the 17th. We have been tracking the reactor data and found spikes after the larger quakes. In unit 1 the radiation changes after a quake. After the last one the radiation in Drywell b jumped 57 Sv/h in a few hours. Info on the recent 57 jump http://wp.me/p1zinA-As This is the larger data and conclusions where the quakes are impacting the plant http://wp.me/p1zinA-zC

  • The last paragraph is one of my next papers main focuses…

    “The ocean surface off-gassing of radioactive compounds and their subsequent redeposition via rainfall may be a modality of rapid hopscotching of water born radioactive contamination across the Pacific. It could also preclude the claims of β€˜no worries’ some have made of the detections; getting caught in such a Radioactive Acid Rain Fall may be much less than safe.”

    For those of you following closely these last five months;

    The main thing we could all agree on is that the rain water in the united states has received is radioactive…

    Can you now explain to me…

    What happens when it snows this winter?

    Rain / sleet and snow, denature, and renature (marry), with radioactive particles in the environment. Bringing them back to earth.

    This is how our live stock / milk originally had become contaminated (rain water seeping into the ground water / thus contaminating our livestock / food chain).


    When it snows there will be an accumulated amount of these same isotopes in masse. Though a main difference will be that the substances which typically soak deep into the soil, will be bio accumulated (at the surface)…

    The rain will not be moderated due to the accumulation’s preservation in Ice/snow…

    Had anyone thought about this point of view…


    All winter we will have layers of radiation from both fukushima Steam releases as well as from oceanic mist’s; Snowing heavily down and upon us…

    Both irradiating us & suffocating / contaminating everything our eco system has to offer our species…

    What will happen to the smallest of species during their hibernation periods???
    Or the species that rely on those species…?

    The planet has a very delicate balance…
    That balance should be expected to be deeply impacted.

    You need to learn to adapt to these changes your self.
    In my opinion, this winter will test us as a species.

    Survival chances will be greatly reduced for the weak / sick.

    I imagine our bodies cell’s are now heavily damaged internally. In these conditions, the slightest cold / or flu like symptoms can stress you past your limit.
    Careless behavior under these conditions, can cause great damages to your bodies ability to create antibodies, to fight off these threats… A slight cut, with weakened immunities could push you past your bodies threshold… Causing pneumonia, infections, and organ failure… Small health defects are now much more likely to occur to humans.

    Please take your time to prepare this winter with not only medical supplies and disinfectants for you and yours, but also medications, and emergency supplies.

    Thank me later…

    Also: Yes Darth: A Data dump as-promised in route within 48 hours…

    I always try to put finishing touches on my own papers sorry they take so long… In a funny way its also my way of seeing if tepco and the iaea will tell you what I know they haven’t told you first…

    I gave them enough information now to fully acknowledge my source… (via locations, of sites / internal operations).
    I am quite certain that does not make them happy.

    Also: I have noticed posters making comments that are alarming. As if they knew all too much about me. “On multiple sites” that I monitor… I’ve been feeling hard pressed with my recent work and findings (in regards to the Fukushima nuclear incident)… I really do appreciate all of your support. Thanks for your hard work and perseverance… I will continue to support this community so long as I can

  • Stephengn

    Remember the good ole days about two months ago when it was way down by 200 sieverts/hr?

    • BreadAndButter BreadAndButter

      Stephengn, that’s exactly what I thought when I saw the chart. I remember the huge outcry here when they had to adapt the chart to 300Sv/h to fit in the graph!
      It’s just ridiculous.

  • dav8d777

    How about we find a good meter then send the President of Japan in there to measure it personally.

    • Pallas89juno Pallas89juno

      Dear Dave: That’s a very appropriate suggestion. I’m completely down with that. If things are safe and we can eat Plutonium (to 35 mg!), etc., then we will force, by pogrom, those needing chopping at the top to perform the most dangerous activities, FIRST. We should also have them somehow explain the compensation rates to those so duped to work for TEPCO on what may, in many cases, be their very last jobs in their very last days, ever.

  • Sky775

    If we are going to speculate wildly about a fissioning mass of melted corium, why hasn’t all the basement water boiled off? Why aren’t photograhs showing huge clouds of steam and the water level falling fast? The water in the basement should be boiling hard with that kind of energy output somewhere in the buildng.

    The radioactivity numbers seem unlikely as well. Chernobyl at the unshieilded reactor core was estimated at about 300 Si/h but the water that is keeping all the readings at 95-105F is also a pretty good shield.

  • BreadAndButter BreadAndButter

    Hey all, atmc.jp page shows also quite impressive spikes of rad levels in many different prefectures today!!
    Graphs halfway down the page!

    • BreadAndButter BreadAndButter

      Akita prefecture showing higher readings than in the past 100 days!

      • BreadAndButter BreadAndButter

        Iwate…also..higher than ever since 5/11…

        • BreadAndButter BreadAndButter

          Iwate graph since 5/11 see here: http://atmc.jp/?n=3
          It MUST have something to do with the drywell levels, don’t you think

          • Sky775

            If you do inverse square calculations on various air radiation levels in Japan, assuming hard gamma and the meter at 400 Sv/h about three yards from the core it works frighteningly well. Of course, those are BIG assumptions but still…

  • James2

    Given the drywell is essentially open to a nuclear reaction – numbers like these are not shocking. I was actually surprised when they weren’t this high.

    Everyone here knows this. We need to stop being dramatic about the new news:

    – The reactors melted down in the first 24 hours.

    – In the next few days reactors 1-4 all exploded. When number 3 blew it ejected Plutonium dust – Extremely deadly dust.

    – Within a week there were reports of random criticality – I was stunned – but by now we’ve seen video of continuous criticality for hours at a time.

    – within a month we saw evidence of corium flow

    – Probably within 2 months the reactor cores had burned through the containment and exited the building.

    – Now the cores are below ground and steam is coming up through fissures.

    – More recently the shared spent fuel pool has caught fire, and that fuel is probably on it’s way to the center of earth by now.

    The only thing new here today is Pallas’s claim that the blobs could go supercritical.

    I hope that is not possible.

    • BreadAndButter BreadAndButter

      Sorry James2, obviously I’m not so super-up-to-date and un-stunned as you are….it’s just me…

    • SimplyInfo

      Do you have any evidence the shared pool is on fire? There seems to be steam from the area. TEPCO doesn’t release stats for the shared pool. They did mention earlier this week that the basement if flooding with water in that building.

      • James2

        Watch the videos. You can see it clearly.

        It’s like sitting on the tracks watching a train slowly approach knowing it is going to kill you.

        The first thing those idiots should have done was eliminate the possibility of the Shared spent fuel pool from catching fire. They didn’t and it has, and it might just kill us all.

        Instead, they spent all their effort trying to cover the whole thing up in the media and on the internet.

        You know, based on that kind of “intelligence” mankind really doesn’t deserve another chance.

      • Dr. Anne Lee Tomlinson Maziar anne

        I have never been able to see this on one of the videos. I suspect that it is true. But I don’t know why we don’t have an aerial view from a drone. Surely, no one was adverse to taking pictures with a drone of reactors #1-4. However, all those pictures are months old. And maybe there is too much radiation now for a drone or robot to function to take pictures. It is scary that we can’t get up to date pictures of all the ten reactors at both Fukushima Daiichi and Daini plants. It is the fact that we are not allowed the pictures that is the scariest of all.

  • nohobear nohobear

    412 sieverts measured, dear God!!! I don’t have a medical background, but if 10 sieverts can kill instantly, I imagine 400 could cook protoplasm instantly. Fukushima has moved into the territory of Ming the Merciless death rays and Star Trek “phaser set to disintegrate”.

    How in god’s name does anyone in Japan expect to stop this when nothing, either human or robotic could survive that level of radiation to effect containment, let alone repairs or cleanup?

    As someone brilliantly outlined in an earlier post,a major design flaw is that situating multiple reactors next to each other, guarantees that if one has a meltdown/meltout, the area will be compromised to the extent that the others will follow suit. Unit 4 is hanging on by a thread. Another earthquake, down she goes. Loss of cooling, bye bye 5 and 6. Dominoes falling in slow motion.

    Speaking of sci fi- the last Star Trek movie featured…….

    (Spoiler alert- don’t read ahead if you intend to see the movie and haven’t yet)

    featured the destruction of the Vulcan homeworld and a diaspora of the remaining 10,000 or so Vulcans out of a population of billions. I hope Japan avoids this fate, but unless the Japanese people wake up from denial and take back their government, a diaspora may well be in their future.

  • blah

    Well … there may be one more optimistic cause.
    What I see is a sensor labelled defective by TEPCO (I know, they are not the most reliable on earth) which alternates between low and plausible values and sudden spikes especially after a quake.
    What if there was a faulty plug or defective contact somewhere which, all of a sudden, after a quake distorts the sensor signal ?
    It may be in the sensor itself, the signal conditionner, an analog-digital converter, a power supply, etc …

    • BreadAndButter BreadAndButter

      …or it might be in Tepco itself….not wanting to admit something’s terribly wrong there.
      See my posts above, WHY are rad levels suddenly spiking in different prefectures TODAY?

      • blah

        I don’t know why radiation increased in other prefectures but if it was caused by the same event that causes the surge of the sensor indications, it would lead to a much greater increase locally, close to the plant. Wouldn’t it ?
        If we think the surge of the sensor reflects a re-criticality, there would be a strong burst of neutrons. Apparently there is no report of neutrons beam.

        I find surprising that only this meter is reporting something. And also, if TEPCO were willing to hide something important reflected by this meter, they would simply shut it down : no data available, instrument broken …

  • catweazel

    If we think the surge of the sensor reflects a re-criticality, there would be a strong burst of neutrons. Apparently there is no report of neutrons beam.

    apparently a lot of points are missing. with happiness and a bit of alcohol everything seems to be ok and getting better (all the time)

    but, a neutron beam visible for the world is something i am really missing as of now….
    “you light up my life” and all that romantic stuff

    • Pallas89juno Pallas89juno

      Dear Cat: Look up previous reports associated with the timing of the spikes on the R1 graph of radiation levels. You will see corollary data about neutron beams. I’m pretty sure there are still neutron beams occuring, for what little that is worth, and we’re just not being told about these. Criticalities are ongoing. There is no possible way to control criticalities with the current strategies being employed.

  • Hot Tuna Hot Tuna

    Don’t know if any else noticed, but the graph for this ‘defective’ meter prior to 7/3/11 maxed out at 300 sv/hr. If the meter was defective, why would they expand it to 400 it it was really defective? Why even show it at all for that matter. Now that the current spike is over the 400 limit, will they re-graph future with 500 sv/hr max or maybe prepare for 1000+?

  • TerraHertz TerraHertz

    Glad to see this story developing. I’ve been watching the data and graphs published here:
    http://atmc.jp/plant/rad/?n=1 (The unit 1 data) since early in the crisis. There’s absolutely no doubt in my mind that the measuring instrument is working fine, the corium is repeatedly spluttering into recriticality in the drywell, and it’s progressively getting worse, ie reaching higher and higher peak energy output levels.

    TEPCO has a history of on again, off again publishing of this data, and even retrospectively altering it.

    I’ve been working on an info-graphic of this aspect of Fukushima’s history, that demonstrates very clearly how blatantly and stupidly TEPCO lies. Nearly finished. Will post a link here when done, hopefully within 24 hours.

  • TerraHertz TerraHertz

    Incidentally, every time the last point on their graph was at the very top of the grid (like this article’s lead image), the next time TEPCO published anything they expanded the scale by 50% to 100% to fit the new, higher data. And also retrospectively altered that last data point to some higher value, that didn’t fit on their previous graph at all.

    I don’t know the Japanese word for ‘honesty’, and I’m pretty sure no one at TEPCO knows it either.

    • BreadAndButter BreadAndButter

      TerraHertz, the atmc-page is set up by a “private” individual. He/she assembles the data published by tepco in these graphs. So the grid is not provided by tepco, but only the readings.

      • TerraHertz TerraHertz

        Are you sure? I realize it isn’t directly TEPCO, but assumed it was some industrial affiliate/agency of TEPCO. The site seems to be very much in a corporate style, even to the way the html is structured.

        But I’m handicapped by not being able to read Japanese. Is the original data published anywhere public? If not, how does a “private” individual come to have it?
        Also, the actual charts include that ‘instrument failure’ excuse, and the timing of when that appeared correlates to the embarrassment factor as if it’s TEPCO producing the site.

        Hmm… looking up http://whois.jprs.jp/en/ for atmc.jp gives “[Registrant] Satoru Yano” but all else is hidden via VALUE-DOMAIN.COM
        Nice. ‘Official data’, but with a layer of deniability.
        Well, I’m going to just go ahead and assume the data is direct from TEPCO, and Mr Yano is on their payroll. If otherwise, he can speak up.

        • BreadAndButter BreadAndButter

          Hey TerraHertz,
          if you scroll down to the end of the page (which have translated by google to German)it says : “This page is set up by a non-profit person, and uses data provided by the prefecture’s officials”. There’s also a web link satoru.net given and an e-mail adress.
          I think Tepco gives daily reports on readings etc., just like the prfectures governments, and that’s what he uses. I also think an “official” page would not have a twitter section with all the concerned comments in it….

  • TerraHertz TerraHertz

    One last point. Over the entire sequence since recriticalities first began occurring in unit 1, the peaks have been getting higher. I’d guess this is due to gradual alteration in the isotopic mix of the corium, plus alloying with elements from surrounding concrete and steel (and dirt/rock if it has melted that far.)

    I don’t know how far that progression can go, and I’m pretty sure that no one, not even nuclear experts, can model such a complex, chaotic process. But… it’s a large mass of nuclear material, undergoing immensely powerful random geometry rearrangements under it’s own thermal output. It would be pure stupidity to rule out the sudden occurrence of supercriticality.

    And so. I hope someone has the foresight to run a 24/7/365 video recording of the plant as seen from say 20Km away through a good telescope. If the entire site goes up (which would be the dirtiest nuclear ignition ever) the world needs the video. As the final stake through the heart of the nuclear fission power station insanity.

  • James2

    Don’t worry Terra – it won’t matter a bit whether it’s filmed or not if the site goes up in supercriticality.

    There is something around 2,000 to 5,000 tons of nuclear material onsite at Fukushima (well there was, who knows where it all is exactly now).

    Remember, the largest hydrogen bomb ever detonated – Tsar – had considerably less than 1 ton of nuclear fuel, and created total destruction for a radius of 22 miles.

    If all that fuel in fuku could go supercritical then, based on the numbers above, it would vaporize not only all of Tokyo, but all of Japan, and all of Korea and a good chunk of China.

    And that would be the gift that keeps on giving, because there are quite a few other nuke plants within that total destruction area. Even if they didn’t light off in the initial flash, they will everntually. With noone left to attend to them, it’s simply a matter of time before they blow too. Pretty soon you’ve glassed the entire planet, and then we leave it to another few more billion years for hopefully more intelligent life to evolve.

    • Well said and put James2 a la Dr R.E. Webb whose scenario I quoted a few days ago at enenews. And a 6.3 MM quake occurred off Fukushima today and will SimplyInfo please step with the meter kicks and the corium shifts?

    • TerraHertz TerraHertz

      James2: “If all that fuel in fuku could go supercritical then, based on the numbers above, it would vaporize not only all of Tokyo, but all of Japan, and all of Korea and a good chunk of China. ”

      No chance of that. A corium supercriticality in the Reactor 1 basement would be messy, but not terribly big (as real nuclear weapons go) since it would initiate too slowly to convert much of the fuel to energy before blowing itself (and the building) apart. I doubt it would even reach Kiloton grade. Definitely not enough to involve the rest of the onsite spent (and non-spent) fuel in the initial chain reaction.

      But, it _would_ blow a lot of that spent fuel (especially the fuel still sitting in the Unit 1 Spent Fuel Pool) widely across the countryside. Which is why I said it would be the ‘dirtiest’ nuclear explosion ever.
      Much worse than the nuclear explosion that seems to have occurred in the SFP of unit 3 directly after the initial hydrogen explosion in the building.

      Actually, my pet theory is there were at least two and possibly three nuclear explosions in sequence in that SFP, within the space of about 2 seconds. Each one deeper into the pool, as water superheated by the prior supercriticality above expanded to steam, thus passing through a density that provided the correct moderation to achieve supercriticality further down among the remaining fuel rod sections. There’s one video of the building exploding, recorded from the live TV feed, on which you can hear three distinct and nearly identical explosions in quick succession. So close together in time and deep enough in the SFP they all just add to that visible vertical column of ejecta, with no other visible effect.

      No one else seems to have noticed those three, very distinct bangs. Even Arnie Gundersen assumes it was just one criticality event in the Unit 3 SFP. But it was three.

      Hopefully someday that will be verified. It’s a really serious design flaw of water-filled SFPs – that they can allow for a cyclically repeating nuclear explosion sequence.

  • James2

    Terra – I agree that it’s unlikely that it would all go supercritical – but if you told me any of it would go critical 5 months ago I would’ve said that was nearly impossible and yet we’ve seen it over and over again. ‘

    So I’m afraid I have to disagree with your “no chance of that” statement. I’m quite certain none of the modeling can predict what is happening or going to happen at Fukushima.

    Regarding your theory of Unit 3 explosion – you are incorrect. It has been confirmed that the Plutonium spread across the countryside in that explosion came from the MOX core, not the SPF.

  • So there is a dispute after all. It will be interesting to know what actually happened and is ongoing. One thing is clear: such beyond design basis disasters can occur in countless ways and in nuclear reactors as we are witnessing and with utter human fallibility at all levels and stages, nuclears must never be an option. They and the entire nuke cycle must all be shut down, the processing of decommissioning them and mothballing them from generation to generation started now. What corruption is going on to make profit in totally trivial ways(no energy to society outside nuke industry) makes that statement made by someone utterly true: power corrupts and nuclear power corrupts absolutely.

  • Hot Tuna Hot Tuna

    So I notice the low ‘peaks’ have been getting lower and today’s 8/19 reading reached the lowest at 30.6 sv/hr. I wonder if that means the nuclear material is going deeper? The graph also has a dotted line for median average, which bc of the lower lows shows the trend going down since May.

    • arclight arclight

      the rate or speed of the coriums, presumably 1 and 2, moving into the mudstone might concour with the pattern in the graph? is thier anyway to compute this? maybe work out a presumed depth too?

  • westcoastgirl westcoastgirl

    Is it dangerous if it just moves into mudstone? It seems safer than hitting water, anyway…

    • arclight arclight

      the mudstone maybe very slightly porous, that might be where some of the steam is coming from. superheated steam that should be able to gouge its way through the rock thereby opening the cracks further.. if there are two coriums at it?? and if there are any pockets of water under thier for the corium or parts could drop into?
      from my knowledge the survey done at the start only surveyed 160 m so there must have been nearly 30 m from ground level to the bottom of the ten metre thick concrete base….leaving 130 m of mudstone to then what?? were they trying to hide an aquifer (sea or fresh water) to make a cheaper job or was it lazyness?
      i find it a bit suspicious that they just built the 10 m base from charity as i have read somewhere! maybe they thought to be cautious but cheap?

  • Misitu

    Glad to see our old friend atmc.jp is back, I had lost hope thinking the honourable anti-misinformation campaign had got him, well done, thanks atmc.jp because your charts are something of evidence in a field where evidence is usually somewhere else. APPRECIATED.