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View Diary: Fukushima: Restoration Roadmap Released Rov #50 (187 comments)

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  •  Update from IAEA (11+ / 0-)
    Based on the information received by 18th April 2011 02:00 UTC the following update related to the reactor units at the Fukushima Daiichi Nuclear Power Plant (NPP), and related environmental conditions, is provided.

    As a countermeasure against a possible tsunami, the distribution boards for the pumps injecting water to the reactor pressure vessels of Units 1, 2 and 3 were transferred to higher ground on 15th April. In order to minimize the liberation of radioactive material into the ocean, two sandbags filled with Zeolite were placed between the Inlet Screen Pump Room of Unit 1 and Unit 2. Further, five sandbags filled with Zeolite were placed between the Inlet Screen Pump Room of Unit 2 and Unit 3 on 17th April. The Zeolite material is designed to capture specific radioactive elements. It is intended to sample and analyze the Zeolite material periodically to determine the effectiveness of this procedure.

    The removal of debris (amount equivalent to 8 containers) using remote-control heavy machinery continued on 16th April.

    Nitrogen gas is being injected into the Unit 1 containment vessel to reduce the possibility of hydrogen combustion within the containment vessel. The pressure in this containment vessel has stabilised. The pressure in the RPV is stable.

    In Unit 1, fresh water is being continuously injected into the RPV through the feed-water line at an indicated flow rate of 6 m3/h using a temporary electric pump with off-site power. In Units 2 and 3, fresh water is being continuously injected through the fire extinguisher lines at an indicated rate of 7 m3/h using temporary electric pumps with off-site power.

    RPV temperatures remain above cold shutdown conditions in all Units, (typically less than 95°C). In Unit 1 the temperature at the feed water nozzle of the RPV is 180°C and at the bottom of the RPV is 117°C. In Unit 2, the temperature at the feed water nozzle of the RPV is 141°C. In Unit 3 the temperature at the feed water nozzle of the RPV is 91°C and at the bottom of the RPV is 122°C.

    In accordance with the report of the Nuclear Emergency Response HQs (Prime Minister's Office) from 15th April, thermography temperatures of the Containment Vessel and Spent Fuel Pool in Unit 1 were 33 °C and 36°C respectively. In Unit 3 the temperatures were 68°C and 59°C at the same positions. Also on the 15th April, thermography temperature of the Unit 2 reactor building roof was 31°C

    As of 16th April, no white smoke was seen to be coming from Unit 1 although white smoke was still observed coming from Units 2 and 3. As of 16th April white smoke was also visible in Unit 4.

    Fresh water injection (around 45 tonnes) to the spent fuel pool was carried out via the spent fuel pool cooling line of Unit 2 and completed by 16th April. Due to the occurrence of an earthquake on 16th April, the motor-driven pump was stopped. The spent fuel pool was confirmed to be filled with water.

    In accordance with NISA Release 94, TEPCO took water samples from the spent fuel pool of Unit 4 on 12th April, in order to examine the conditions. The sample was taken by using the arm of the concrete pump vehicle. At the same time, the temperature of water in the spent fuel pool of Unit 4 was measured with a thermistor attached to the arm of the concrete pump vehicle. The activities for I-131, Cs-134 and Cs-137 were 220 Bq/cm3, 88 Bq/cm3 and 93 Bq/cm3 respectively.

    There has been no change in the status in Units 5 and 6.

    The power supply to the Common Spent Fuel Pool was temporarily interrupted due to a short-circuit on 17th April.

    "Compassion is the radicalism of our time." -- Tenzin Gyatso, 14th Dalai Lama

    by Siri on Mon Apr 18, 2011 at 01:22:27 PM PDT

    •  Link for the report (9+ / 0-)

      "Compassion is the radicalism of our time." -- Tenzin Gyatso, 14th Dalai Lama

      by Siri on Mon Apr 18, 2011 at 01:23:57 PM PDT

      [ Parent ]

    •  Stabilized? Unit 1 RPV pressure is stabilized? (11+ / 0-)
      The pressure in this containment vessel has stabilised. The pressure in the RPV is stable.

      Isn't the rpv the thing we've been obsessing over -- the one that's reported with an (A) and (B) value?  The data page calls it "P core" and reports it in kPa, right?  Before they stopped providing them in English, Nisa Meti called this "reactor pressure?"

      From the reports on the Japanese site:
      http://www.nisa.meti.go.jp/...
      Today's report lists it as 1.131 MPa, so the trend would be
      Apr 15:  1.054
      Apr 16:  1.076
      Apr 17:  1.074
      Apr 18:  1.131

      Maybe they mean dial A is stabilized?  I guess it is -- it seems to be broken.  Or perhaps they are discussing the drywell pressure.  It is going down (170 today, down from 185 on Apr 15).

      BTW, have a look at the suppression pool temps here for units 1 and 2. 2's getting toasty.

      "On their backs were vermiculate patterns that were maps of the world in its becoming. Maps...of a thing which could not be put back. Not be made right again."

      by middleagedhousewife on Mon Apr 18, 2011 at 02:28:08 PM PDT

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      •  Well it's the IAEA - Bit of a rant to follow (11+ / 0-)

        A crisis is concerning, bad news is stable because hey, it's been bad along!, and any progress is to be touted as the final solution and trumpeted endlessly. Their pattern is to repeatedly post the same item day after day if it relates to a step forward but either neglect to mention or bury negative aspects. Did you see they were STILL including that sentence about "early progress..." re: the electrical system and instrumentation? They make me laugh. They're really trying so hard.

        They do report some data that isn't in other English language reports since NISA started just issuing those short excerpts. Things like the white smoke and specifics about moving debris and laying bags.

        The drywell pressure is going down while they are still injecting nitrogen which means it's not holding air. This is a bad thing so why they label that "stable" is anyone's guess. I supposed if it was bad yesterday and it's bad today that can be called "stable".

        Also they are reporting those thermography readings as if they were gospell truth when we know that the #4 reading from the sample came back significantly higher than the thermography readings showed. They don't mention that at all and they don't mention the temp that came back on #4, just the analysis results.

        I put this out there because it does contain relevant raw data, but I think I've made my feelings about IAEA reporting clear over the last few weeks. Glad to have you join my rant :)

        I wonder if I should start charting this stuff again here since the datapage just stopped again. Thanks for the heads up on the suppression pool temps.

        The suppression pool temp data is relatively new. I'm not surprised they're elevated though. Continued steam blowdown into the pool will increase the temperature and they have been venting steam. I think a concern would be, if the temp at one part of the pool is significantly higher than another, the variable condensation pressures can cause structural instability.
        see that info. on suppression pools here  The IAEA report does note that steam stopped coming from #1 today. I wonder if they are taking a break venting through the torus to address the temp issue. No idea...just tossing a thought out there.

        "Compassion is the radicalism of our time." -- Tenzin Gyatso, 14th Dalai Lama

        by Siri on Mon Apr 18, 2011 at 03:15:23 PM PDT

        [ Parent ]

    •  Did they happen to mention the (10+ / 0-)

      temperature of #4's spf either by thermistor or thermography?
      I'd love to see how well they match up.  

      "On their backs were vermiculate patterns that were maps of the world in its becoming. Maps...of a thing which could not be put back. Not be made right again."

      by middleagedhousewife on Mon Apr 18, 2011 at 02:31:35 PM PDT

      [ Parent ]

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