Gov’t: Radiation levels too high in Unit 4; Coming from small pieces of Cobalt-60? Workers forced to cover floor with lead — Experts: ‘Significant loss of leaktightness’ possible in Fukushima fuel pools

Published: February 11th, 2014 at 4:39 pm ET


IRSN (France) (pdf): Water temperature in the [spent fuel pools] increased, sometimes to the boiling point. […] The most notable point is without a doubt the impact of hydrogen explosion on the SFPs. Overall, it appears that the pools resisted the hydrogen explosions but a significant loss of leaktightness in the pools and dewatering of the fuel assemblies may have occurred, seriously aggravating the situation in terms of radiological conditions at the site and releases into the atmosphere.

Asahi Shimbun, Feb. 6, 2014: The Nuclear Regulation Authority said Feb. 5 it instructed Tokyo Electric Power Co. to reduce radiation exposure among workers who are removing spent and unspent fuel from a reactor building at the Fukushima No. 1 nuclear plant. The NRA issued the instructions after it started studying radiation levels around the work site on the fifth floor of the No. 4 reactor building in December. NRA officials said they found high levels of radiation emitted from cobalt-60 that was apparently mixed with shavings produced when workers cut into reactor components inside the storage pool there. […] The NRA found that the use of lead plates on the floor […] reduced the radiation levels […]

The NRA says the high radiation levels are from Cobalt-60 ‘shavings’ produced by workers… yet the chart above from a NRC FOIA document (pdf) indicates Co-60 readings were nearly 17,000 Bq/liter just a month after 3/11.

See also: [intlink id=”nuclear-expert-rods-spent-fuel-pool-melted-breached-during-explosions-contents-be-contact-groundwater-fukushima” type=”post”]{{empty}}[/intlink]

Published: February 11th, 2014 at 4:39 pm ET


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318 comments to Gov’t: Radiation levels too high in Unit 4; Coming from small pieces of Cobalt-60? Workers forced to cover floor with lead — Experts: ‘Significant loss of leaktightness’ possible in Fukushima fuel pools

  • Heart of the Rose Heart of the Rose

    So.. there was as story a few weeks back.. about gamma shine.
    The story was about the tanks and Bremsstrahlung.
    I ask if the gamma was coming just from the tanks..or the whole plant.
    I believe the answer I got was the tanks.

    But there is a certain amount of Co 59 in the structural materials of the assembly.

    Characteristics of Spent Fuel From Plutonium Disposition Reactors
    Oakridge National Laboratory

    Pg. 28 ..4.3

    I'm one that believes 4 exploded/burned .producing Co 60..and released.

    Bottom of same page showing.. Co very involved in producing gamma radiation.
    So I think the whole plant is emitting gamma.
    (other gamma emitters..yep).
    So the removal of debris..cutting ..increases and already high level of ..Co 59.

    • HoTaters HoTaters

      Greetings, HOTR (sounds almost like my user name shortened, ha, and have to do a double take sometimes). Am curious to know why you thought #4 exploded and burned. I'm convinced by photos, videos, and NRC docs released under FOIA that #4 burned several times.

      Am recalling looking at video someone posted on #4 at night (Tepco webcam or maybe Nuckelchen video) showing what looked like a very large explosion with flames and lots of black looking smoke coming from #4. Can't remember what time frame that was, but for some reason June, 2011 comes to mind.

      Something exploded and caught fire on June 10, 2011. Just can't remember what it was, right now.

      I wouldn't be surprised at all if there is very little left at all, of the SFP's at #3 and #4. And funny, nobody ever talks about the common SFP and what may or may not have occurred there.

      Have been noticing our West Coast US (California) radiation readings have recently been 2 1/2 to 3 times lower than they were when the work was supposedly being done to remove spent fuel from SFP #4. Sacramento, CA airborne CPM levels ( are below 100 for the first time in at least six months.

      What gives? I value your opinion and would like to know what you think.

      The gamma shine situation there is really concerning. Someone here said yesterday they think some of the workers are just being outright sacrificed to do the SFP work. I don't doubt it, sadly.

      • HoTaters HoTaters

        Also, Reno, Nevada CPM counts have consistently been in the mid 300's (340's and above) to as high as near 512 or something, in the last six months. Tonight they are currently 184 CPM per NETC. That's about half or less than levels there have measured for a long time. I've been hoping and praying they would go down, as we have family and lots of friends there.

        The idea of people being slow roasted all over the country definitely doesn't appeal to me. Anne's area, where James Tekton, Kevin Blanch are, have just been "hot" off and on lately. Even south Texas has had high levels lately (Sickputer) as well as all of us in the southwest, midwest, and east. Have family in Colorado and Texas, too, and it I'm concerned about them.

        So many friends and allies here, all over the U.S. and the world whom I think about. I hope you will be blessed and be well.


      • #4 melted out, AND burned in several places, AND exploded.

  • Radioactive Cobalt 60 Properties, Dangers, Half Life, Nuclear Weapons, Radiological Accidents, Negative Health Effects, Food Irradiation, Radiation Poisoning Cases, Activity, Decay Chain, Fukushima

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