Pressure in Reactor No. 1 drops close to normal air pressure — Proves that ‘air’ inside reactor is escaping outside

Published: June 5th, 2011 at 4:11 am ET


Pressure in No.1 reactor drops close to atmosphere, NHK, June 05, 2011:

[…] Pressure inside an operating reactor is normally around 70 atmospheres. But after the disaster, the pressure indicator showed 6 atmospheres in the Number 1 reactor, raising questions about data reliability.

On Friday, the utility replaced the gauge with a new one and made measurements again.

The reading was 1.26 atmospheres as of 11 AM on Saturday, almost equal to normal air pressure. The company says this proves that air inside the reactor is escaping outside. […]

Published: June 5th, 2011 at 4:11 am ET


Related Posts

  1. Japan Times: Fukushima workers were concerned pressure was escaping from cracks caused by 3/11 quake — Tepco refuses to investigate inside Reactor 1 for quake damage July 27, 2012
  2. “Cover over Reactor 1 is only cosmetic” — Built to keep webcam from filming badly damaged building — Has nothing to do with preventing radioactive materials from escaping June 13, 2012
  3. Increased risk of explosion at No. 1 reactor after drop in pressure and temperature — TEPCO: Risk of explosion “is not high” April 29, 2011
  4. Japan’s worst-case scenario assumed “significant public exposure” to occur by end of March 12 because of pressure buildup that would damage No. 1 reactor container (VIDEO) May 3, 2011
  5. Former Fukushima Daiichi Worker: My best guess is explosion had to blow lid off pressure vessel at Reactor 1 August 2, 2012

65 comments to Pressure in Reactor No. 1 drops close to normal air pressure — Proves that ‘air’ inside reactor is escaping outside

  • BetaFlare

    “Everything is now normal, internjet along with this site can be closed for your sake. Be assured, we will provide you more clean energy, straight inside you. And if smtg is not normal enough, we shall detonate you sm more…”

    Clean betaflares, neutrino death tunnels through the earth: (Plutonium Reactor 3. FOUR detonations: Not for the Guyundersee deaf)

  • Rosie

    Cld someone please explain what this means?

    • Bread+Butter

      Hi Rosie, I guess it means that air just exchanges as it likes to between reactor and outside world. Taking all the nasty particles with it, without possibility to hold them back.

    • Steven

      Normal pressure 70 atmospheres, current pressure 1.26 atmospheres. Abit like a flat tyre on your car. Really flat. Usually indicative of a large hole. Too big for a can of Zoosh.

      In a car tyre, a puncture like this is usually caused by something sharp going in. In an RPV it’s not supposed to happen at all, but at Chernobyl it was caused by something hot coming out.

  • Gerry Hiles

    Data reliability? Yes well …

    I checked the IAEA web site and it turns out that all of their conclusions are based on “official sources”, i.e. government and TEPCO.

    They never did a study (maybe never went to the site at all).

    If it was not for such as Arnie and such as taco here, we would never know anything reliable on which to base our projections.

    But I had sufficient knowledge base (not in detail) to know, from the start, that this is a global calamity which is unstopable. “A permanent radioactive volcano.” (Not sure, but I think I came up with that before anyone else.)

    It is almost certainly an “extinction event”.

    Our “Titanic” global industrial civilization has just hit the “iceberg” of Fukushima … except that this ‘iceberg’ is hot.

    Never mind, I will stick by the analogy.

    • misitu

      !They never did a study (maybe never went to the site at all).”

      Stan Laurel: B B B B BUT! There’s a snap of Mike Weightman at Fugushima with a plasterer’s face mask. They MUST have went there!

      Oliver Hardy: You stooooopid! Neva herda PhotoSHOPPP! Fake! (slaps Stan) Fake!! (slaps Stan really hard) FAKING FAKEY FAKE!!! (knocks Stan into the spent fuel pool)

      Another fine mess you got us into …

    • coot

      I like “Nuclear Shit-Storm” myself….

  • pAnIc

    Who analyses this, Homer Simpson? It “proves” that the thing has holes, which is also why the water they’re pouring in on top is now in the basement. Doh. The “air” that escapes outside shouldn’t be so much because, you’ve guessed it, there is no pressure inside.

  • Gerry Hiles: “If it was not for such as Arnie and such as taco here, we would never know anything reliable on which to base our projections.”

    LOL. Arnie the deaf? Who turns sound off before “analysis”. LOL

    Just LISTEN how Arnie the goebbels fairy tale blows ouch

    • Gerry Hiles


      Have you nothing betterr to do than troll and make personal attacks?

    • coot

      Yes, and you on the other hand, are so credible, we all believe everything you say. When we bother to stop and read your ‘Posts of Drivel’ that is….

  • In terms. If this is the reactor “D/w” dose pressure, that dropped.
    That leads us to a grim conclusion…

    reactor 1 yesterday was holding 255+sieverts/ hr. dose rate…

    So in terms if the pressure is leaking to an atmospheric level. Meaning there is no pressure at all…
    That indicates, that we should be asking two very important questions…
    A.Is the radiation no longer being contained within the containment?
    B. does that imply that “this” 250sv/h is now the atmospheric release on site?

    If the dose rate is effectively raised in any form at this point tepco has no… And I mean NO way to restore any cooling systems in regards to reactor 1 sfp, and core cooling units…

    This is big…
    Tepco is now in the worst state of “check” since the crisis.
    All bets are off.
    Evacuate tokyo.

    Women, children, and the elderly should all now seriously think of evacuating japan temporarily… The men should stay behind to attempt taking a shot at containing this crisis.

    It’s the best way to protect japans integrity, while taking “actual precaution” towards avoiding radiation exposure in all respects to the innocent…

    This isnt a joke.

    People are fucking being contaminated… If international communities don’t step in soon. We won’t be able to host families abroad due to their own radioactivity…

    people will be stranded contaminated, irradiated… No one will be able to help them…

    I think all of the usa needs to go on strike. In fact I think every nation in the world needs to form protests and strikes… Telling their national leaders that if they are not protecting us. Than we aren’t going to work… Military, police, firemen, bankers…

    News flash Pro or con… If you do nothing We all might die… Isn’t that worth a few minutes of bickering and a few days off…

    This is not a joke.

    We really really really need to start covering the reactors no later than today. We simply cant postpone any longer. Tepco…

    • Detroit is a perfect places for international citizens to reside… By taking evacuees alone… The explosion of economic growth would both strengthen international affairs, and raise large securities in the failing american greenback.

      This is a huge chance for america to step up its outlook on international affairs, while lowering the national debt limit significantly…

      • Gerry Hiles

        I generally respect and support you taco, but on this one you are delusional.

        You have lost all my respect, you are just another Usan looking for advantage in a typical Usan way, e.g. make a profit out of war and natural disasters.

        Now I read you, in your own words, and I am disgusted by your greed to get Japanese refugees to rescue the US bankrupt US economy, just so YOU can maintain YOUR life-style. What? With compliant Japanese assembly-workers in Detroit making a new car for you to buy?

        What? I have valued your input on technical data, but now you have emerged as just a typical Usan ‘special person’.

        • misitu

          With deference, Gerry, my impression at this point tacomagroove was thinking aloud.

          This is of course in general not a great idea on the internet, but we all get carried away sometimes.

          In hindsight the statement could be analysed as having mixed motives, as you indicate.

          I believe this not to be so in this particular case as tacomagroove has a long posting history that consistently demonstrates compassion.

          Sincerely, Misitu

        • dude im trying to convince them to move 36million people to safety…


        • coot

          So? Who cares what you think. If millions of Japanese do not start relocating somewhere they are doomed. Resettle them in Detroit, and Minneapolis (I live here), and St. Paul, and Gary and Toledo and Cleveland and any of a dozen more northern cities. I got room for a small familly, send em over to my house god damnit.

    • has already failed japan.
      Dont let them fail humanity.

    • jump-ball

      So maybe Northern Japan will eventually receive the controversial ebola virus quarantine strategy?

    • Lee Binder

      >> We really really really need to start covering the reactors no later than today. We simply cant postpone any longer.

      Fuku is not Cherno. Cherno was mostly burnt out therefore “sarcophagusable”. At Fuku we’re dealing with active corium which, if watering stopped and covered, would either blow up right away, or eat its way into the ground water and then blow up. Man kind at this point does not have ANY means to stop a nuclear volcano. This is Pandora’s Box at it’s direst. Sorry for the bad news. Might sound odd, but the most effective thing we all can do is to pray for a miracle …

      • coot

        I have read this also. Disturbing ain’t it. Our so-called leaders are themselves clueless….

    • After reading here for a long time I decided to act.

      I’m on day 11 of a hunger strike.

      I’m primarily trying to reach the audience to my yoga site/YouTube. Maybe my “gentle” introduction video to this mess would be helpful to someone you know. Perhaps to those that don’t read this site (and certainly don’t hit reload like me, waiting for an update).

      To all those here… To the great brains sharing, to the big hearts glowing, to the people from Japan sharing very personal stories and to the trolls and shills that out themselves by their violence and old tactics… thank you, love and light m

      Intro to Hunger Strike video:

    • I agree Taco, shut the MONEY down and the Govt will have to listen to the people. It is the only way they will pay us any attention and take right action.

      `I think all of the usa needs to go on strike. In fact I think every nation in the world needs to form protests and strikes… Telling their national leaders that if they are not protecting us. Than we aren’t going to work… Military, police, firemen, bankers…`

  • Ihre Anhaltende Kritik

    Nice work. Thanks.

  • mikael

    No suprice, its a closed compartement riddeld with holes, so another no-news.
    Its also normal reading, inside something that is not a container, peroid.

    The fission is there, acording readings, but are probably eating it self thru the floor, the “magma” has to go somewhere.
    And its not miraculy disapearing somwhere.

    Why havent we seen any Infra or Ultraviolet pictures, and so far nothing close to anything sensible and news that gives a better picture, they the TEPCO and the Japan gov. are stil lying and hiding data. This TEPCO and Japan gov is feeding us with fu… bullshitt and you shitthaeds better stat to show us some real fu… figures, this rubbishnews from the latest day are an insult to us all.

  • nomade

    “A permanent radioactive volcano. (Not sure, but I think I came up with that before anyone else.)”

    Actually I’ve been thinking about that… the China Syndrome is a kind of downward flowing radioactive volcano.

    At first I was thinking, well, judging by the way things are going now, it might be the best solution. Let the reactor core entomb itself seeing as how we can’t.

    Then I realized that that would pollute the magma as well… we get contaminated sea, contaminated ground water and contaminated magma.

    …so when if there’s a volcano eruption we’d get deja vu all over again with volcanic ash circulating the globe.

    Unless the extreme heat in the earth’s core would neutralize the radioactivity somehow?

    Just musing about what happens when the cores escape the “containment”… not sure how fast or far they’d travel downwards.

    • misitu

      nomade Hello,
      The aerial and oceanic dispersion are real and continue; likewise the soil, food, and urban contamination. I would not however worry too much about the subsurface geology. But that is with my ex-geologist’s hat on and I am finding it difficult to explain simply, whereas I would like to try.

      Let’s try:

      The earth’s internal composition, structure, and tectonics are on a grand scale. Volcanoes and earthquakes, and the shape of the continents, are evidence of this. Geological events are measured in millions of years, as the thickness of rock strata also shows.

      I don’t have a clue as to what is under Fukushima Dai-ichi and its “recent reclaimed ground” except that it is likely to include relatively soft sands and clays over a foundation of faulted and folded limestones, metamorphic, and igneous rocks comprising the local continental crust margin which itself ovelays the oceanic (basaltic) crust; both crusts overlay the mantle which is of a heavier composition and covers (as far as I recall) the magnetic, liquid, iron-rich core. Please forgive me any inaccuracies: it was a long time ago.

      Anyway, the currents in the core drive the mantle movements which move the continents creating as they do both mountain ranges and oceanic trenches. As with the lifetimes of these events, the forces involved are unimaginable to the layman.

      My opinion for what is may be worth is that, while this nuclear event has consequences that are unprecedented and devastating for the biosphere, there will be little interaction with the tectonic system that has served our planet for the last 4,500,000,000 years.

      In a nutshell; don’t expect any volcanoes.

      E&OE, sincerely, Misitu

      • Cassie

        Many thanks Mis for this reply.
        I hope then it all sinks into the ground.

      • Gerry Hiles

        Hi Misitu. I find myself agreeing with you again. Again: thanks for moderating my reflections on what taco said about mass evacuation to Detroit, but I will point out that (whatever the motive) it is delusional to imagine tens of millions of people relocating to anywhere … and it is to lack all understanding of human nature to preach to anyone in Japan about what they should do.

        If I was there (whether or not I was fully aware of the circumstances) I would stay, so as to be with family and friends in familiar surroundings. Personally I would know that I was going to die, but I would be circumspect, e.g. I would not tell I child what I knew was in store for him too; rather I would encourage a make-believe world he could be happy in for as long as he might live. And I would be circumspect amongst numerous ‘adults’ too.

        I long-since became forced to realize that very many humans never “grew up” beyond the level of a 3-5 year old emotionally, “I want it NOW. The world revolves around ME.” And so on with what fuels consumerism, for instance (shop ’til you drop) and thus the demand for ever more resources and energy supplies and, finally, Fukushima.

        Billions of virtual children, at all levels, got to play, directly or indirectly, with the original processes by which solar systems are formed (I don’t think anyone has ever seriously challenged the Kant-Laplace Theory).

        In its original state our planet could not have hosted life-forms … only after the decay of highly radio-active elements over millions of years … which are “newly created” in nuclear reactors. Homo sapiens (wise), I think not!!

    • fjn

      The earths core is radioactive. It contains considerable amounts of uranium. In fact one of the reasons the earth has not cooled more then it has is because of fission. Now since uranium and all the other fissionable elements are extremely heavy they tend to end up truly in the core that is near the center of the planet. The corium cannot get below the water table since once it hits the water it will be effectively cooled just as it would be it if it was in the ocean. However it would also permanently pollute the ground water and eventually the coastline and the surface as well. There was and is a way to contain it but it would require that the Japanese except the cost just as the Russians did. Massive man power and the complete mobilization of the military and industry. Dig down around the plant then slant drill under the plants. Blow in borated cement till you have a solid platform below the plant. Now build up the walls around the whole thing till they are well higher than the tallest building. Now start filling the whole mess with borated sand and cement. Leave vents above each reactor so that you can flood the stuff below but capture and contain any affluent that escapes. This is not a cheap, easy or safe undertaking but it is the only way you will contain this mess. If the corium reaches ground water you can kiss a lot of things goodbye. But I do not think they will do this. Tepco and the Japanese government have spent more time and effort on protecting their portfolios then their people.
      They have been doing this on the cheap since day one and they will continue to do so till it is too late.

  • SteveMT

    It’s been raining at Fukushima, but there is no catharsis in sight.

    Evacuation is long overdue in the name of Humanity. What more evidence do they need? What are they waiting for?

    The People should just leave the area. They do not need the government’s approval.

  • Maa

    Trees are starting to turn red near fukushima. Watch the live cam here

    • The Red Forest at Chernobyl…..

      Red Forest
      From Wikipedia, the free encyclopedia

      Coordinates: 51.38011°N 30.04908°E The Red Forest (Ukrainian: Рудий ліс, Russian: Рыжий лес), formerly the Worm Wood Forest, refers to the trees in the 10 km² surrounding the Chernobyl Nuclear Power Plant. The name ‘Red Forest’ comes from the ginger-brown colour of the pine trees after they died following the absorption of high levels of radiation from the Chernobyl accident on April 26, 1986.[1] In the post-disaster cleanup operations, the Red Forest was bulldozed and buried in ‘waste graveyards’.[2] The site of the Red Forest remains one of the most contaminated areas in the world today.

  • Well today being AEST(Australian Eastern Standard Time).

    • Steven

      “the utility estimates that the lack of a big hole in the reactor is keeping steam inside, leading to the slightly higher interior pressure.” (from your link)

      I would dispute this. With the amount of water around, I expect some lower portion of the RPV might be under water. I cannot confirm this, so my postulate depends on further data for verification. I would also expect any hole in the RPV to be at the bottom, i.e. also under water within the constraints of my postulate. The ‘head’ of pressure created by this submersion might easily account for the 1.26 atmospheres of pressure in the RPV.

      This would allow for a large hole, rather than a small hole or holes, in the bottom of the RPV under the circumstances I describe. The object responsible for creating the large hole would, by common rationale, be outside the RPV. This would account for the very high radiation readings outside the RPV.


    The absence of pressure at reactor #1 is very ancient news: nothing new has happened.

    TEPCO installed a new gauge on Friday. On Saturday TEPCO admitted the pressure is GONE at reactor 1 — a fact that TEPCO has known about for months.

    Now we have new information — but not a new condition.

    Pressure didn’t suddenly fall three minutes after TEPCO installed a new gauge. The integrity of reactor #1 went down the drain long ago.

    REPEAT: Nothing new has occurred.

    Or, as tacomagroove would put it, “Condition Red. Wolf. Wolf. Wolf.” Take your pick.

    The situation was bad, is bad, and will be bad for a long, long time. But low pressure at reactor 1 provides no reason to panic today more than yesterday.

    Before you flame my tail, please read the news story below.

    • jump-ball

      TY DP.

      Like I said, if the 50 story office tower in the city near you is engulfed in flames, and the fire department starts issuing varying levels of thermal intensity, well, it’s time for a new fire department, and for those nearby to evacuate.

      There is only illusory reassurance from following the various detailed metrics of an ongoing, uncontrolled disaster, like price upticks in a crashing stock or real estate market, or pressure and gauge readings from the mismanaged gusher during the Gulf of Toxico contamination.

      Jamie has it partly right (below): until a situation is actually under some kind of control, detailed changing ‘readings’ are blah, blah, blah.

      But worse, these ongoing declarations falsely infer some measure of control in a still-unfolding, potential worldwide disaster, which is probably still chaotic in nature.

  • nomade

    If the 6ATM measure was correct then the containment was still containing things a little bit.

    Now it’s containing practically nothing…the holes got bigger in the absence of anything except corrosion/molten fuel?

  • jamie

    I’ve lost count of all the “reports” on Reactor 1.

    It’s contained. It’s not contained. The fuel is mostly melted. The fuel is partially melted. The fuel is fully melted. The fuel may have breached the RPV. The bottom of the RPV is about to fall out. The water in the basement is radioactive. There is 100 Sv/hr in the drywell. There is 250 sv/hr in the containment. Blah. Blah. Blah…

    If there is 250 sv/hr then no one installed any new instrumentation anywhere near that thing. They would be dead in about 15 seconds (10 sieverts is immediate death). That means no one is going anywhere near reactor #1.

    I suspect with all the fireworks we’ve seen recently, reactors 4 and 3 are the same. Personally, I suspect there is no one on site anymore.

    • Unintentional Foul

      You might be right, for all I know, about nobody on site.

      As for the remainder of your comment — picture perfect to my eyes.

      TEPCO intends to install new gauges on 2 & 3 as well.

      My bet is that 2 & 3 have no pressure.

  • nomade

    Seems they’ve been using seawater (not fresh water) for cooling since day 1?

    There must be a lot of salt in there by now.

    • Steven

      This is a question I’ve been trying to find an answer to for awhile nomade. TEPCO describes the use of ‘fresh water’ in their status reports, but those same reports (which go back to day 1 of the incident) make no mention of any change from seawater to fresh water. I would also doubt, with the scale of destruction in the area due to the earthquake/tsunami, that they could access the quantities of fresh water they require.

      Disturbing, as the salt water/corrosion issue is huge, and can only get worse if they continue to use seawater.


  • nomade

    Sorry Misitu, missed your reply before. Many thanks for the clarification!

  • Cindy

    TEPCO has said 250 Seiverts inside the drywell, and 4,000 milliseverts inside the reactor room near the doors, or some such thing, reading were taken by robot within the last few days.

    So, slowly more radiation is coming into the building. It is already unapproachable , wondering what they are going to do.

    It has been stated it is too hot to permanantly contain, so the thought is to continue cooling it with water until it is ok to seal it in sand and concrete like in Chernoble….

    • One day soon we may be saying

      *What are we going to do? *

      I can`t see an answer for that as hard as I try. Its easier to call out ideas and opinions from the sidelines it seems.

  • TraderGreg

    The corium is hot and getting hotter by minute. The cooling efforts fail (including boron) – as per Taco. It will burn through concrete fairly quickly (based on the research done previously). Depending on the thickness of concrete – it takes 2-5 days. Then there is sand and soil, and various rock, which I don’t know what is the thickness and composition.

    Since this is old news, my guess is that the corium already has burned through the concrete, and it is heading down through the various layers between the dry well, and the water table.

    Should be getting interesting. That’s why they release the old news, because we are just about to hit the next stage of it.


  • nomade


    “Since this is old news, my guess is that the corium already has burned through the concrete, and it is heading down through the various layers between the dry well, and the water table.”

    What layers? Won’t it go straight into the groundwater? I thought the groundwater was above the level in the basement already?

    Also, what is the risk of a steam explosion?

  • Heart of the Rose

    In the meantime: Another day and another all white sky over Fukushima.

  • Heart of the Rose

    Vient silencieusement la mort.

  • milk and cheese

    I note that they tend to discuss events from April…the Reuters video was unusual in that it appeared to be current.

  • nomade

    Why no new news on enenews? Same old headlines as yesterday I see?

    Lots on NHK today though… including:

    1. Question. How to dispose of highly radioactive waste? Answer: Let local municipalities burn it in their incinerators.

    2. Iodine levels in the sea off #2 have gone up 4 fold in the last few days

    3. They’re going to open the doors of #2 to let the steam out

    4. They admitted over double the amount of radiation got released than they’d previously said.

    4. Meltdowns all happened a lot earlier than they previously said…#1 had melted down 5 hours after accident

    5. Lots of rubble emitting around 1sV lying about.

    etc etc.

    Here’s one link… you can get the others on the site.