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  •  Pressure, Water Level/Temp. UPDATES through 3/29 (12+ / 0-)

    We have historical data stored by reactor/by date in the Daiichi Database Diary (h/t middleagedhousewife) for 3/17 - 3/25. In light of that, I'm just going to cover 3/26 - 3/29. These 3/29 #'s are based on NISA's 2nd release for 3/28 measurements taken at 14:00 found in a nice graphic here

    Please note: This info. is NISA's second release for 3/29 stating the time as 15:00 though the readings are for 12:00. There is usually a release of data readings for 14:00. These do not appear to have been released.

    Fukushima - Daiichi                  
    Updated with readings as of:        03/29/2011          
    Please note: The water levels are measured from the top of the assemblies down to where the water is. These assemblies are exposed.                  
    a "-" sign will be in front of the number as long as they are reporting that water is below the assemblies.  
    Please note: the fuel rods are approximately 4 meters long (4,000mm). So if a reading is -2,000, 1/2 the rods are exposed.              
    Pressure readings are MPa, Temperature reading are Celcius, Water level reading are in milimeters (mm)                  

                 Reactor    Reactor     Reactor        Reactor    
                Pressure  Pressure    Water     Containment                                                
                Gauge 1   Gauge 2     Level          Pressure          
    Reactor 1              
    26-Mar    0.452    0.481    -1650/-1600    0.275
    27-Mar    0.475    0.517    -1650/-1600    0.270
    28-Mar    0.477    0.553    -1700/-1650    0.270
    29-Mar    0.484    0.592    -1650/-1650    0.275
    Please note: NISA's first release on 3/29 had Reactor Pressure Gauge readings at 6:00 for A & B of .493 and .603 respectively. These appear to have fallen somewhat though they remain elevated.           

    Condensation Chamber Pressure
    26-Mar     0.275
    27-Mar     0.270
    28-Mar     0.270
    29-Mar     0.275

    Temp on RPV Feedwater Nozzle/Plenum at Bottom
    26-Mar     212.3/146.9
    27-Mar     224.8/143.4
    28-Mar     304.5/139.3
    29-Mar     309.6/137.6

    Reactor Water Temp & Spent Fuel Pool Temp: Unknown

    Reactor 2
    26-Mar    0.074    0.074    -1200    0.11
    27-Mar    0.083    0.081    -1200    0.11
    28-Mar    0.069    0.069    -1500    0.10
    29-Mar    0.076    0.074    -1500    0.10

    Spent Fuel Pool Temp
    26-Mar      57.0
    27-Mar      67.0
    28-Mar      49.5
    29-Mar      46.0

    Temp on RPV Feedwater Nozzle/Plenum at Bottom
    26-Mar      107/99
    27-Mar   123.6/111.2
    28-Mar    144.1/60.0
    29-Mar    158.5/120.3

    Condensation Chamber Pressure: Under measuring range
    Reactor Water Temp: Unknown

    Reactor 3 - A&C
    26-Mar    .139/0.0    n/a    -1850/-2300    0.1068
    27-Mar    .133/.002    n/a    -1900/-2300    0.1076
    28-Mar    .126/.006    n/a    -1850/-2250    0.1076
    29-Mar    .130/.006    n/a    -1850/.2250    0.1075

    Condensation Pressure Chamber
    26-Mar     0.1836
    27-Mar     0.1806
    28-Mar     0.1792
    29-Mar     0.1796

    Reactor Water Temp & Fuel Pool Water Temp: Unknown
    Temp on RPV Feedwater Nozzle/Plenum at Bottom
    26-Mar    33.7 (under survey)100.4
    27-Mar    13.6 (under survey)/121.6
    28-Mar    41.9(under survey)/124.4
    29-Mar    62.2 (under survey)/121.1

    Reactor 4 - Spent Fuel Pool Only - First Reading since 3/16 available 3/24. As of 3/25 coming up as "indication failure"
    16-Mar     84
    24-Mar   100
    25-Mar - 29-Mar Indication Failure

    5&6 Spent Fuel Pool temps are stable and cool. Reactors were in cold shutdown before the earthquake.

    Per NISA's summary report
    http://www.nisa.meti.go.jp/...
    Under section 3, Condition of each unit, the following is noted for EACH reactor building 1 through 4.
    White smoke was confirmed to generate continuously Unit 1 (As of 06:30 March 29th)
    Unit 2 (As of 06:30 March 29th)
    Unit 3 (As of 06:30 March 29th)
    Unit 4 (As of 06:00 March 29th)
    TEPCO's webcam is currently off so there is no way to confirm if the steam is still being generated. This notation regarding white smoke being continuously generated has appeared for several consecutive days.

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

    by Siri on Wed Mar 30, 2011 at 12:36:59 PM PDT

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