Iodine-131 surge in Japan. Strontium-90 nightmare.

New sludge data from Japan shows recent increases in iodine-131. This suggests increases in fission, probably from Units #2 and #3. Certainly the plant has become more active in emissions lately. The CSFP has been emitting steam and smoke, but hopefully this is not the source of I-131. We would be in very bad trouble if that pool went critical.

Deposition of I-131 is dependent on wind direction and precipitation (rain and snow). This map below shows the locations of the prefectures in Japan. The Fukushima Daiichi plant is on the coast in the middle of Fukushima prefecture. Gunma is furthest west… winds seldom blow from east to west in winter. In spring and summer this prefecture has prevailing winds from this direction, and hence readings tend to be higher there in those months.

And Tepco has found a fault in their radiation measuring apparatus. It turns out that groundwater from the well at the seaside direction from Unit 2 has a lot more strontium-90 and all-beta radiation than they previously said. It used to be 900,000 Bq/liter, now it’s 5 million Bq Sr-90 and 10 million Bq all-beta. And this was from July. This same well had the incorrect analysis of all-beta going from 900,000 to 3,100,000. Applying this ratio yields over 17 million Bq/liter of strontium-90 in the most recent measurement.

Tokyo Electric Power Co. corrected its radioactivity readings for groundwater from a well at the crippled Fukushima No. 1 nuclear plant to a record-high 5 million becquerels of strontium per liter.

TEPCO officials said the strontium levels were gauged again because the previous data was wrong. They also said radioactivity readings for water taken from other wells before September were also likely erroneous.

The company had said 900,000 becquerels of beta-ray sources, including strontium, were detected in water taken on July 5, 2013, from the observation well near a water intake for the No. 2 reactor turbine building.

The new strontium data indicates that the concentration of all beta-ray sources totals around 10 million becquerels per liter of water, according to the company.

TEPCO did not announce radioactivity levels of 140 samples of groundwater and seawater taken between June and November after it found strontium readings that were higher than measurements for all beta-ray sources.

The company attributed contradictory data to malfunctions of analytical equipment. (link)

How convenient that they had an equipment breakdown before the Olympics were awarded to Tokyo.

Regarding the delayed disclosure of data, Tepco stated they were taking time to investigate the cause of wrong analysis. However after all, they didn’t release the data, which strongly suggests the on-going sea contamination, before IOC selected Tokyo as the host city of Olympic 2020. (link)

Enenews had previously linked to this pdf, which was a simulation of three different radionuclides leaking from corium to groundwater. Strontium-90 doesn’t start leaking in significant quantities until 1,000 days after the meltdown, which was approximately the time frame from last July. Cesium-137 doesn’t really get going until after 10,000 days. This is consistent with the finding of large amounts of strontium and other beta, but very little cesium in the well. According to the graph, it keeps going for 297 years. After that, these radionuclides would have decayed. The graph doesn’t contain plutonium, which would keep going for centuries or millenia.

28 thoughts on “Iodine-131 surge in Japan. Strontium-90 nightmare.

  1. Kyodo, Feb. 7, 2014: TEPCO to review “massive” radiation data due to improper measurement – [TEPCO] said Friday that it will review a “massive” amount of radiation data it has collected at the crippled Fukushima Daiichi nuclear power plant because readings may be lower than actual figures due to improper measurement. “We are very sorry, but we found cases in which beta radiation readings turned out to be wrong when the radioactivity concentration of a sample was high,” TEPCO spokesman Masayuki Ono told a press conference. Beta ray-emitting radioactive materials include strontium-90. […]

    It is possible that this could go farther than strontium and all-beta measurements. That is, they have been lying/wrong about everything from the beginning. Which sounds plausible.

  2. I think I sense the end of their lies coming. They will simply walk away.

    I, for one,….can no longer read their numbers (lies). Like eating meat,…it immediately SOURS my stomach!

    • Tepco actually found the fact that they had been analyzing Strontium-90 in the wrong manner out on 10/2/2013. Tepco stated in the press conference of 2/10/2014.

      However they didn’t announce that until last week.

      NRA (Nuclear Regulation Authority) realized the randomness in Tepco’s measurement result by August. They sent the inspectors to the laboratory of Tepco on 10/8/2013, but they didn’t find anything to prove that Tepco has been analyzing in the wrong matter because Tepco changed it 6 days before.

      It is not clear if Tepco intentionally covered up their wrong analysis before NRA came.

      There is a possibility that the actual accident evaluation will be raised from now as Tepco gradually reveals the facts that they have been concealing since 311.

  3. Nice to know in epilogue when corium hit groundwaterium.
    Meanwhile, dolphins have a message for human kind:
    “So long, and thanks for screwing up our fish!”

    Quote: “We would be in very bad trouble if that” [Common Spent-Fuel] “pool went critical.”
    That understatement is only eclipsed by TEmPCO’s understated, underreported, self-underminded, self-incriminating, self-depricating, selfish sure-as-shite untrustworthy incomplete cherry-picked doctored “nukular” data.

    TEmPCO can kiss my honkey white ass. They are not allowed to leave that site, or there will be hell (shareholders) to pay! They will continue to sacrifice young nukular “virgins” until there are no more to sacrifice. That is what they are shamefully paid to do.

    Loved your article. Like the messenger. Hate the implications. Excellence, as always, Bobby1.

    Dilution is no solution to nuclear pollution! ’nuff said. 🙂

  4. Hey Bobby thanks for the hard work, keep it up. Some material breakdowns of what might be in the pools.

    A breakdown of the BWR Spent Fuel Racks (US-Patent)

    The neutron absorbing material 36 preferably comprises Boraflex which is an elastomeric silicone polymer matrix manufactured by Brand Industrial Services, Inc. of Parkridge, Ill. Other neutron absorbing materials may be used if desired. The Boraflex is approximately 0.045 inch thick and extends substantially the full length and width of the side wall on which it is mounted. A wrapper plate 54 of 0.035 inch stainless steel protects the Boraflex against physical damage and is welded along the edges to the L section wall surfaces. The wrapper plate 54 may terminate short of the end of each L-shaped section as shown in FIG. 10, or extend to the complete end. An inspection hole 55, FIG. 10, is used to visually verify proper placement of the neutron absorber material. Also, it will be noted that each alternate cell on the module periphery is closed by a panel 58, FIG. 4, which extends the cell complete length.

    To form a spent fuel rack, all the L-shaped sections are assembled into cells as described above, and with this construction, the interior of each cell, other than those cells located on the module periphery, is bounded by walls having neutron absorbing material located either on the inside or the outside walls of a particular cell.

  5. And this might be handy if you did not see it yet.

    (Dec 2 2010 – Argonne National Laboratory)Fuel Assembly Decay Heat Calculation:

    Using the decay heat table, we can obtain the thermal output as a function of time after shutdown.

    Six Cases Involving Shutdown Plants and Spent Fuel

    • Case #1: Fuel in Closed Reactor Vessel
    • Case #2: Fuel in Open and Drained Reactor Vessel
    • Case #3: Fuel in Spent Fuel Pool –Natural Circulation-Decay Heat Regime: 5 days to 40 years.
    • Case #4: Fuel in Completely Drained Spent Fuel Pool-Decay Heat Regime: 5 days to 50 years.
    • Case #5: Fuel in Partially Drained Spent Fuel Pool
    • Case #6: Dry Fuel Movement and Storage

    * * * ” Water addition:adding water to the bottom of an empty spent fuel pool can damage an assembly with a heat rate of 7kw or less that has reached equilibrium in air! –The water can block the circulation of air and cause the fuel assembly to overheat. The heat removed by the low level of water is insufficient to cool the assembly. ”

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