Tepco: Steam may be from gas leaking out of containment vessel at Fukushima Reactor No. 3

Published: July 26th, 2013 at 3:34 pm ET


Title: Steam Found Near the Central Part of the Fifth Floor (Equipment Storage Pool Side) of Unit 3 Reactor Building
Source: TEPCO Press Release
Date: July 26, 2013

[…] the steam is likely to generate in the following mechanism […]

The steam is estimated to be the rainwater, which was streamed down the gap of the shield plug and was heated by the head of the PCV. Also, there was a difference between the nitrogen injection amount (16m3/h) and the extracted amount (13m3/h) of the RPV and the PCV. Therefore, the gas including this difference amount of water vapor (approx. 3m3/h) is likely to be leaked from the head of the PCV, etc. It is estimated that this water vapor was cooled since the surrounding air was relatively cold when it was emitted to the upper part of the fifth floor of the Reactor Building via the gap of the shield plug, and it was observed as the steam.

See also: [intlink id=”fukushima-unit-3-steaming-yet-again-asahi-high-radiation-levels-detected-by-where-steam-observed-third-time-in-a-week-tepco-does-not-know-where-its-coming-from-photos” type=”post”]{{empty}}[/intlink]

Published: July 26th, 2013 at 3:34 pm ET


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  1. Tepco: “Significant density” of Alpha radiation leaking from Unit 3 at Fukushima — Steam seen at reactor building “likely to be leaked” from containment vessel August 14, 2013
  2. AFP: ‘Fukushima reactor site engulfed by steam’ — Kyodo: ‘Something like steam’ coming from unknown source at Unit No. 3 — Tepco: ‘Continuously wafting through the air’ — Work to remove rubble suspended July 23, 2013
  3. Reactor No. 3: Containment vessel not holding air pressure — Gas may be leaking from damaged part of container, says TEPCO (VIDEO) July 16, 2011
  4. Asahi: Tepco can’t find where huge amount of highly radioactive water is leaking at Reactor No. 2 — ‘Fractures’ in containment vessel suspected December 12, 2012
  5. ‘Mysterious’ steam at Fukushima Unit 3 — NPR: “Fuel could have shifted… or worse restarted nuclear reactions” — Tepco: “We still don’t know for sure the cause” (AUDIO) July 25, 2013

27 comments to Tepco: Steam may be from gas leaking out of containment vessel at Fukushima Reactor No. 3

  • domjox domjox

    The question has been asked, why is this ''steam" not been on going for the last 2 years? It has rained there other than just recently.

  • Max1 Max1

    So which is the truth:

    Steam from rain or gas from reactor?


    … spells tepco

  • This is fabrication. The amount of steam was to ominous to be a small amount of rain water… We all know there is no proper ventilation of air within the fuel pool. The collection of hot air is hampering the cooling efforts. Once the surface water heats up it sinks to the bottom of the spent fuel pool. Thus the fuel behind to boil… They need to remove the roof of the fuel pool and install a proper air ventilation system. Tepco will have an even harder time cooling the fuel pool come hotter weather, which will likely lead to engine failures…

    • Teddi Teddi

      I just read where Tepco has lost over 1750 employees. Numerous reasons where given in the Japanese article such as shut down of other plants, cuts in pay, working conditions, doubts of their future with respect to the nuclear industry, etc.

      One thing that caught my attention was that over 70% of these losses were in senior management and technical positions.

      Which begs the question – what is the quality of those left making the decisions ?

  • Max1 Max1

    Never have I seen a WINDSPILL poison the water we drink…
    Never have I seen a SUN ACCIDENT poison the food we eat…
    Never have I seen a TIDAL WAVE poison the air we breathe…

    … But I have seen OILSPILLS, FRACKING and NUCLEAR ACCIDENTS poison you and me.

    • +10000000

      Hydrogen is FREE, Sunshine is FREE.

      oil, nuclear, coal, and gas are all very expensive because the costs are shoved off onto the environment, future generations and taxpayers.

      If the promoters of all of these expensive, dirty, toxic and poisonous and polluting energy shources included all of these and other 'hidden' healthcare costs that they should also be required to pay, renewable energy would be the cheapest thing going, by far.

      Instead, we get to have a monopoly, with no choices.

      • Teddi Teddi

        Comments are also free is one does not have to consider practicality and the scale involved.

      • AntonButler

        Mr "atomicinsights" believes that nuclear power will save Detroit,
        and deletes all factual posts.
        The problem with pro nuclear people is that they behave like a SECT.
        Inventing its special truth, which are deadly lies.
        Science and lies mix badly to kill innocents.
        Nuclear power waste will kill people in the future, yet unborn.
        How much more criminal can one be?
        Nuclear power pros are stating people born in the future do not have a right to life. These are HITLERs followers in the present age. There is no difference between the then and now, the result is the same , many dead innocent victims.

  • Jebus Jebus

    This will piss you off…

    TEPCO says was reluctant to worry public over leak

    TOKYO — The operator of Japan's crippled nuclear plant said Friday that it delayed acknowledging that the plant was leaking contaminated water into the sea because it did not want to worry the public until it was certain there was a problem.

    TEPCO President Naomi Hirose said Friday that the company delayed acknowledging contaminated water was leaking into the sea even though obvious signs of leaks were detected in May because officials were waiting until they were certain there was a problem before making such a "major announcement."
    Hirose apologized for the delay and said that he and TEPCO executive vice president Zengo Aizawa would take a 10 percent salary cut for one month over the matter.

    "Rather than proactively inform the public of potential risks, we retreated to negative thinking and tried to gather more data to ensure there was a problem because it was going to be a major announcement," Hirose said. "We've been trying to reform, but we repeated the same mistake. Obviously, our effort is not enough. We are really sorry."


    • sentinelle sentinelle

      I find the volunteering of a 10% cut in salary for a month a tiny slap on the wrist, offensive and insulting. No honor here. None. How about rather they volunteer a 90% cut in personal oxygen intake. All of them. Then maybe the Japanese can bring in people who want to limit collateral damage without personal agendas.

      Basically by saying they were waiting to see if it was a problem shows that they can't fix it and it's only going to get worse. So they waited until it was so out of control, it was obvious they were lying. 10% salary cut!!!! A cut is right, but not regarding salary.

    • obewanspeaks obewanspeaks

      Pretty sure we have all been lied to since the day we were all born…sad.

  • weeman

    We want definitive answers not speculation, let's face it you don't know, I don't know, no one knows, but I don't see any meaningful scientific data being provided, let's face it you are out of your league and you should admit that and act responsibly.

  • June 2013
    From the Japanese “blog of waiting Chan” comes the news that xenon-133 and xenon-135 have been detected at the Fukushima Daiichi gas management facility. Iodine-135 Xenon-135 is generated in a nuclear reactor from the radioactive decay of tellurium-135, a fission product. Xe-135 is the most powerful neutron absorber known, and this process extinguishes a nuclear reaction. This is known as the iodine pit.


    In other words, fission is still happening at Fukushima.

    Cold shutdown at FUKU?

    Radioactive Xenon gas transmutes into SOLID cesium. This is why cesium levels keep rising all over Japan.

    Radioactive Xenon Gas; Dangerous And Lung Cancer Causing Isotope; via A Green Road

    • hbjon hbjon

      Boron, water, and can absorb quite a bit of radiation too. The problem from the beginning was how to get the boron into the corium. Impossible task. Bunker busters loaded with boron may have been an option very early. But, that action is so drastic and causes other problems.

  • jackassrig

    There's an article a zerohedge.com "Nuclear Power Is Being Abandoned Worldwide." Apparently reactors have declined from 444 to 427. After FUKU this is too little too late. Learning from our past mistakes is not an option for the mankind.

  • NO way this is steam from 'rain'. The hot spots are way too hot. Their infrared camera only goes up to 50C, which is 122F. There are spots hotter than that, which would create steam.

    The evidence is clear, and this was taken by TEPCO employees.

    THEY KNOW. The bad news is that this confirms no cold shutdown, and active fission happening on site, as of today.


    • the camera shots I link-showed have a concrete corium, and metal "Cone" at the base of what was once the #3 PCV that builds up to the RPV middle-point at the top. This has water SITTING on the remains of corium.. and so helping it to fission. They capped the top, it's going to come out someplace as the pressure builds.

  • They are literally COVERING IT ALL UP, or CAPPING IT with concrete.

    Nice way to try and deny a potentially global life extinction nuclear disaster.

    The formula;

    lie, lie, lie

    minimize, minimize, minimize

    cover up, cover up, cover up,

    swear everyone to secrecy or death as a penalty (Yakuza does that)

    complete control of mass media in US and Japan

    complete control of regulators

    complete control of politicians who wag their tails when needed

    FEAR, their most effective weapon..

    Call all of the above 'honorable' somehow.