NHK: Extremely high levels of radiation detected just above Reactor 2 containment vessel — Radioactive substances suspected to have moved through location (VIDEO)

Published: June 15th, 2012 at 2:11 am ET
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Fukushima Daiichi Nuclear Power Station Unit 2 Reactor Building Inspection Result (3rd-5th Floor) (June 13, 2012)
Tepco Press Handout
June 14, 2012

High radiation one floor above reactor
NHK
Jun. 14, 2012

Tokyo Electric Power Company says it has detected extremely high levels of radiation on a floor just above the No. 2 reactor at the crippled Fukushima nuclear plant.

[...]

The company said a reading of 880 millisieverts per hour of radiation was detected on the fifth floor, which is 4.5 meters above the reactor containment vessel.

TEPCO suspects radioactive substances leaked from the No. 2 reactor moved through the location.

[...]

During the Fukushima nuclear accident the No. 2 reactor is believed to have released the largest amount of radioactive substances.

[...]

Watch the video here

Published: June 15th, 2012 at 2:11 am ET
By
Email Article Email Article
23 comments

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23 comments to NHK: Extremely high levels of radiation detected just above Reactor 2 containment vessel — Radioactive substances suspected to have moved through location (VIDEO)

  • realself

    What is that intense light? Are we looking straight at the containment vessel or up toward the cieling at a light fixture? I can't get my bearings in this video.


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    • Nigwil

      The two photos above are as per the two green arrows – one looks across the pool above the reactor Primary Containment Vessel (which contains the reactor pressure vessel)pond, and the lower photo looks across the spent fuel pond.

      Its an interesting view because (when you think about it) the ponds above the PCV and spent fuel have to be connected, if one dries out the water level in the other falls too, to the level of the bottom of the connecting slot that the fuel rods are swung through. There is a gate that can be installed to seal between, but who knows if it is.

      So it appears that the cap of the PCV is still water tight, and the PCV is still sealed into the base of the reactor pond. But beneath, in the PCV we know that the RPV is holed and the corium has probably left the building through the bottom of the PCV.

      http://en.wikipedia.org/wiki/File:BWR_Mark_I_Containment_sketch_with_downcomers.png

      Quite what is causing the radiation levels to spike on the top deck is a mystery to me, as all the core is now several floors below.

      It is certainly 'interesting' that they are now saying that No 2 reactor has released the largest amount of radioactive substances. After the very public explosions at #1 and #3, and the secret explosion at #4 (does anybody have video or at least date/time of #4 going up? – I don't buy the 'hydrogen leak from #3' idea.) I wonder what has gone on behind closed doors at #2 to cause them to come to that conclusion?


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  • Toadmac

    " the No. 2 reactor is believed to have released the largest amount of radioactive substances."

    IMHO the visible damage of 1,3 & 4 would suggest each one of these reactors released a lot more of there death than 2?
    I guess you could say the other three didn't leak, they vaporised what death they had to offer!
    Peace.


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  • From the bottom of my heart I wish everyone knew

    US government officials
    http://www.usa.gov/Contact/Elected.shtml

    Consulates
    http://www.usembassy.gov/

    Jet streams, rad-free food and radiation remediation protocols
    http://realitycheck.no-ip.info/forum/index.php/board,24.0.html

    Fukushima radioactive fallout forecasts and other rad updates
    http://realitycheck.no-ip.info/nnn.html

    Aloha all doing what you do and power to your duck and cover

    P.s. for night owls…an Occupy bedtime story from Zucotti Park
    http://www.youtube.com/watch?v=ftswPPsTyIw&feature=player_embedded


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  • BreadAndButter BreadAndButter

    They repeat it ad nauseam: "TEPCO needs to find and repair the damaged parts of the reactor to recover melted nuclear fuel before starting to decommission the reactor. But it says high radiation often stops workers from entering the building. This scenario means it will take a long time to find the problems in the containment vessel."
    Hellooo? With levels as high as 0,88 Sv/h nobody will get near that RPV for a very very long time, let alone do any "repairs".

    ANYONE can figure that out, why doesn't anyone SAY it publicly?
    Argh.


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    • BreadAndButter BreadAndButter

      Just to repeat for enewsers who might be new to the site:
      7 Sv are considered a lethal dosis (you die after ca. 2 weeks).
      4 Sv are considered to leave you with a 50/50 chance of survival.
      (Not discussing the also deadly consequences of lower exposure here)
      The actual 0,88 Sv/h at unit 2 would mean a worker would receive a 100% lethal dose after 8 hours.

      How could anyone with a sane mind discuss "repair works" here?


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      • GeoHarvey

        We might bear in mind that these readings are 15 months after the initial event, and the levels have gone down since then. Since we do not know what the isotopes are or what the initial reading was, we cannot know how long it will take for the radioactivity to be reduced to a point that someone can actually function in the area. I cannot guess, but it certainly will not be sometime soon.


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    • iso-tope iso-tope

      We have a WINNER. That's exactly it. Yes. It's so obvious I mean I am speechless at the their logic and thought.


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  • Bubbha

    It's
    Ike when my brother helps with a project. He LOOKS busy but never gets anything done. There is nothing they can do. No coreium to douse, no tent to build.


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  • chrisk9

    I have studied this map and survey a number of times trying to understand what is causing these dose rates. At first I thought loose surface contamination might be the source since this reactor had the explosion that ripped apart the Torus last March. Since containment was lost vast quantities of loose surface contamination have escaped. This contamination went everywhere all over the country, but the largest quantities would be closest to the source. If the buildings ventilation system was ever turned on, air from the lower floors returns to the refueling floor as standard operating procedure.
    But wait a second, why would the highest doses be right over the reactor cavity? Maybe there is a hole in the roof right over this area, or maybe the ventilation system flow path would deliver most of the return air right over the reactor.
    But there is another possibility that just sounds too crazy to be true. The source is not loose surface contamination, but is coming from the reactor itself. On top of the pressure vessel sits a large metal cap that seals it. On top of that sits another cap-the drywell head, that is also made of steel. Both of these caps are impressive structures that use bolts several feet long to attach them. On top of the drywell head are several concrete blocks 3-5 feet thick called shield blocks. During normal operation no dose rates are ever detected from the core. That is because of the water in the reactor cavity along with all these structures. TBC


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  • chrisk9

    So if the source is from inside the reactor what does this tell us. First thing would be that the water level inside the reactor is very low. A foot of water cuts the dose rate by a factor of 10. Normally the fuel would be under about 15 feet of water. Do the math and that would not be possible and have the dose rates that exist on top. In fact there may be close to zero water. It is also possible and likely that the pressure vessel head and or the drywell head have blown apart underneath. The concrete shield blocks still reduce the dose rate significantly, and there is still 880 milliseverts on top. If the source is the reactor itself then no one will ever remove these blocks and ever attempt to look inside. Removing the blocks ever will be deadly.
    TEPCO can figure all this out as well as I can. Why are they even wasting their time. Just enclose it all with concrete.


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  • harengus_acidophilus

    Sure?
    "Just enclose it all with concrete."
    Out of sight, out of danger?

    h.


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  • There also a spent fuel pool in reactor 2? I forget ….


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  • Urban27

    The June values are higher – obviously radiation must have increased this period.
    This shows situation is not under control. TEPCO now admits they are not in control of the situation. It is time to bring in someone with more ability.


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  • Bot Cam VIDEO – inside Fuku #2
    Recording 880 millisieverts per hour

    What IS that bright light? anybody… Arnie?

    (#11 of 12)
    http://www.youtube.com/watch?v=PGyHN7NNp0k&feature=bf_prev&list=UUUosMib8bx-B6KNnqFmzfIQ


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    • The closer to the 'glow', the higher the millisieverts. (?)

      That's how it appears to me.


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      • Spookydark

        The light you see in the picture is sun light. This link, previously posted to this thread by Bobby1,

        http://www.gen4.fr/blog/2012/06/le-niveau-de-radiations-est-extrêmement-élevé-dans-le
        s-niveaux-supérieurs-de-lunité-n-2-de-fukushima-daiichi.html

        shows the picture as the third scrolling down the page. The caption under the picture reads: «Shot taken near the west wall of the unit n.2, showing the well of the reactor. The overexposure corresponds to the location of the anti-explosion panel taken down, visible in the shot here below». The caption of the next picture reads:
        «The unit n.2 on March 23. Notice the steam/smoke escaping through the anti-explosion panel»


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  • razzz razzz

    @chrisk9: Sounds about right. Unit 2 vented itself by blowing out a wall panel allowing hydrogen (and fallout) to escape and not buildup inside the building.

    The large caps with bolts for the RPV & PCV have 'seals' (like rubbber 'O' rings) that are the first to fail and leak (self venting), no matter how many bolt or how big the flanges are.

    Then, since the roof never blew off Unit 2, how did they get water into the spent fuel pond? Did it boil dry during the power loss? It that where all the fallout came from as the fuel assemblies started vaporizing? This, besides the reactor core melting down and venting out the missing side panel the whole time.


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  • Heart of the Rose Heart of the Rose

    "Suspected to have moved through"
    There is always that little hint of past tense.
    By the look of the radioactive "confetti" in the photos.
    I think the present tense would be more appropriate..
    Radioactive substances are moving through the location.


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  • iso-tope iso-tope

    So painful to watch…

    It's just the darnest thing.. Radiation.. I can't figure it out..

    "Workers at plant seem to come accross new challenges and problems, every day, at the DAMAGED NUCLEAR POWER PLANT – Their latest find? Extremely high levels of radiation inside the building of reactor 2".

    REPONSE: "Send a robot in to take video and measure radiation….
    (on the 5TH FLOOR)"

    "They SUSPECT radiation moved through the area…"

    "They HAVEN'T DETERMINED HOW IT ESCAPED the containment vessel…."

    "Need to find and repair the damaged parts of the reactor so they can
    recover MELTED NUCLEAR FUEL and start the decommisioning process. But
    they say HIGH RADIAION OFTEN STOPS WORKERS FROM ENTERING THE BUILDING. This means it will take ALONG TIME TO PINPOINT THE PROBLEMS IN THE CONTAINMENT VESSEL."

    Hmm. Gee.. This is a DAMAGED AND DANGERIOUS Facility. It ISN'T a research and figure-it-out, recovery project where you can take all the time in the world and then try to recover the worlds most dangerious subtance.

    My god.. Inhibit the nutrons, incase with cement, and seal it for thousands of years… So dense and they don't understand….


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