NHK: Molten nuclear fuel “could be exposed from the water” at Reactor No. 1 (VIDEO)

Published: December 23rd, 2011 at 11:04 am ET
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21 comments


Nuclear Watch: Next Steps, NHK, Dec. 22, 2011:

At 1:40 in

  • The most important thing to find out right now is the temperature of the molten fuel and the temperature of the water
  • At Reactor No. 1 they believe most of the molten fuel has fallen from the pressure vessel to the bottom of the containment vessel where there is no thermometer
  • The amount of water has not been measured accurately with a water gauge and has only been guessed
  • Some of the molten fuel could be exposed from the water

Watch video on NHK here

Published: December 23rd, 2011 at 11:04 am ET
By

21 comments

Related Posts

  1. Water level now below BOTTOM of fuel rods in No. 1 — Suggests nuclear fuel is in a molten mass at bottom of reactor (VIDEO) May 12, 2011
  2. NPR: How can Fukushima’s molten fuel be contained so it stops contaminating the planet? Nuclear Expert: There’s no way to get at molten fuel… I’ve not seen a solution to this (AUDIO) September 17, 2013
  3. Japan TV ‘News Flash’: Officials fear melted reactor fuel is now exposed at Fukushima — Tepco: We don’t know at this point if fuel is uncovered — Large drop in water level — Experts ‘struggling’ to find condition of nuclear cores, nothing is known for all 3 reactors (VIDEO) June 10, 2014
  4. Photo after 3/11: “What looked like molten fuel leaking out of a gap at top of Reactor No. 1” (VIDEO) August 13, 2012
  5. New images show all melted fuel is “gone” from Fukushima reactor — Experts: Molten core may have reached outer environment, can’t tell if fuel is still contained — Official: “We presume fuel still in containment vessel… but we need to check one day” (PHOTOS & VIDEO) March 20, 2015

21 comments to NHK: Molten nuclear fuel “could be exposed from the water” at Reactor No. 1 (VIDEO)

  • This would explain the Iodine 131 readings being constant across large areas !

    Constant leakage of Iodine 131

    大きな地図で見る 12/22/2011, Gunma local government announced they measured 17 Bq/kg of Iodine 131 from the sewage sludge of a water purifying plant. They also measured 44 ~ 68 Bq/kg of cesium from 6 plants too. The samples were taken from 12/6 ~ 12/14. They measured Iodine 131 from the samples of 11/21 ~ 12/1 as […]
    http://fukushima-diary.com/2011/12/constant-leakage-of-iodine131/

  • BreadAndButter BreadAndButter

    “…where there is no thermometer”.
    Cold shutdown under 100°C, yeah, right.

    If they didn’t KNOW that the fuel is exposed, they wouldn’t publish this information.

    • Am I right in thinking we’ve discovered a new way to achieve cold shutdown of a BWR Mk I reactor?

      Wait til they’ve melted through, then take measurements of empty reactor vessels with non-existent thermometers.

      • radegan

        Remember, they have achieved cold shutdown ‘conditions’, such as pressure vessel temperature, nobody said they achieved cold shutdown.

        • BreadAndButter BreadAndButter

          Ah yes, the fine line between bending the truth and lying. I read in Mainichi today: “The latest announcement that the goals of the road map have been achieved is merely the result of officials lowering their own hurdles. It reminds me of the time during World War II when the Imperial Japanese Army headquarters called the Japanese army’s retreat a “shift in position.”

          argh.

          • Bob Hardin Bob Hardin

            Cold shutdown/cold shutdown conditions. This kind of thing–this sophistry–is worse than lying. It insults our intelligence.

        • Good eye. I spotted that yesterday, then forgot it.

          Thanks for the reminder.

          I see the Wall Street Journal is up to its usual tricks:

          http://online.wsj.com/article/SB10001424052970204553904577101641846568640.html
          The total radiation dispersed over a broad swath of northern Japan is equal to about 15% of what was released 25 years ago from Chernobyl, the worst nuclear accident in history.

          • More gems from the article above:

            The government’s announcement Friday was pegged to a technical measure of stability indicating that, nine months after a tsunami precipitated meltdowns at three reactors, fuel temperatures are now cool enough to be considered safe. The cool temperatures mean those reactors are emitting little new radiation into the air, and are no longer undergoing nuclear fission.

            The declaration that the plant is stable brought to the forefront a host of other pressing issues that Japan must deal with in the wake of the second-worst nuclear accident in history. Those include questions of how to decontaminate the region surrounding Fukushima Daiichi, how to compensate the people evacuated from areas where radiation levels were highest, and when to tell them they can return.

          • James2

            I don’t understand how in the world you could possibly get 15%.

            That’s a total flat-out lie.

            Nobody doing any research whatsoever could come to that conclusion.

      • many moons

        Well Tepco did say it was a VIRTUAL cold shutdown. Now we know, a virtual cold shut downs uses virtual thermometers!

      • HoTaters HoTaters

        Yes, and the only way to measure if there are releases is to check a gauge. “” … so the containment vessel’s gas detector is effective in identifying whether an anomaly has occurred ….

        But at reactor no. 3 the radiaton level is too high and no detector has been added. The so a gas cetector the reactor building must be decontaminated so that a gas detector can be installed as soon as possible ….

        (RE: cooling system):

        “The system is temporary as it uses non robust hoses. It is imperative that they change to a proper stainless steel cooling system to speed up the process of making the nuclear power plant safe.”

        TRANSLATION: the reactors are not safe.

        RE: THE COOLING SYTEMS:

        “The first major challenge is to fill water in order to shield the powerful radiation they need to fill the reactor and containment vessel with water.

        But the containment vessel has holes which need to be plugged the area has high radiation levels which making it impossible for people to work.”

        TRANSLATION: There is no cooling as the containment system (one or more reactors) has failed and is full of holes. Since it is full of holes and there is no cooling, the radiation level is sky high. Since the radiation level is so high, we can no longer work on the site. Therefore we have abandoned the site, have declared cold shutdown, and request international assistance, as the situation is out of control and we can no longer pretend ….

  • James2

    These folks are piling lies on top of lies.

    This one is a lie too.

    The spent fuel pool of #3 has collapsed and is on fire, and spewing mega amounts of radiation

    They don’t want anyone to question the radiation that is emanating from Fukushima, so they give you Unit 1, which they’ve already admitted to.

    What they don’t give you is spent fuel fires, which are even more dangerous – because there is much more fuel there.

  • Actually the nhk dude did explain things enough that tepco claimed cold shutdown but other officials say they really don’t know whats going on in the reactors. #3 doesn’t have a gas gauge installed as radiation is too high. Also the technology required to remove the fuel isn’t available at this time. So at least uncertainty was reported. Mainstream is slowly skating towards the truth. Diagram of melted out fuel should make some people think if their not to busy buying Xmas presents

  • Maxxforce

    One might look at the graph of the drywell radiation readings to see that fuel has been exposed on a regular basis.
    http://atmc.jp/plant/rad/?n=1
    It is some very interesting reading to take the INPO report(http://sciences.blogs.liberation.fr/files/11_005_special_report_on_fukushima_daiichi_master_11_08_11-1.pdf) and the ORNL BWR accident sequence simulations (http://www.ornl.gov/info/reports/1981/3445600211884.pdf) and overlay the admitted facts and timelines in the INPO report with what was simulated. There are newer versions of the ORNL report, the first is a good place to start.
    My conclusions are that the core melted, the bottom head failed and the corium pooled in the drywell. At several points the drywell radiation reading was 450+ Sv/hr which leads me to believe that coruim was exposed to the air. As time has passed it has become a series of spikes and has only recently calmed down.
    This lead me to read some research on corium coolability in an ex-vessel accident. After reading my thoughts are that the spikes are due either to gas vents pushing up through the corium and erupting above water level (think of volcanic magma eruptions underwater) or from chunks or core and pieces of RPV equipment that continue to fall out of the RPV as it has been cooled down by the water injection.

    Just my thoughts.

  • bleep_hits_blades

    These guys sure have the fine art of mumbo-jumbo-speak down pat, don’t they?

    Ya gotta hand it to ’em. They’ve got the public’s number. Public wants to believe it is not that bad and not to worry. Rather than try to penetrate the dignified-sounding gobble-di-gook, Joe Public will think, OK, doesn’t sound too bad…I guess. Now on to the fun and games for the day.

  • dosdos dosdos

    Science is a system of verifying empirical information that can stilted however one wishes by withholding part of the data. Science is deductive reasoning, twisting the data to suit an argument is inductive reasoning.

  • Highly Probable Triple Corium Pressure Vessel Basement Floor Migration Severity Magnitude –

    – Daiichi Complex Site Decontamination Effort Viability Becoming Inevitably Impossible Rapidly.

  • Spectrometising

    I spectometised about 5 months ago that the fuel rods made of Zirconium were developing a layer of scale and complex compounds on the surface like objects which become encrusted in the sea. In turn, this is forming an insulating surface allowing the material to go on a thermal runaway so that it is constantly vaporising material into the environment. There may be more Zirconium fires/explosions.

    In any case, i have a Facebook page now and am performing food/environmental testing now that i have enough Lead shielding to perform gamma spectrometry and regularly post on the link provided.. Anyone wanting to perform more substantial testing for under 700$ should look at http://www.facebook.com/pages/Gamma-Spectacular/146649762066972 Of course, i do not think it is a money making venture based on this cost. Similar out of the box, automatic systems for performing analysis are tens of thousands. Of course, i have not included the cost of the Lead shielding. In my case, this amounted to another 700$. I am in the process of testing cans of salmon from Canada at the moment and anything i can get my hands on.

  • Spectrometising

    Typo…Around 700$, but if a new Sodium Iodide scintillation detector is purchased to work with the system, then the additional cost might be double. The cost of the PC interface is around 250 Dollars and the software is free from Sydney university. Details can be found on the link posted above and below.. The Facebook website is not my own.
    http://www.facebook.com/pages/Gamma-Spectacular/146649762066972