Fukushima Daiichi NPS Prompt Report 2013

This is follow-up information regarding the water leak from the underground reservoirs at Fukushima Daiichi NPS.

The results of sampling performed in the drain holes of the underground reservoirs No.1-7 (at 14 locations), the leakage detection holes of the underground reservoirs No.1-4 and 6 (sampling could not be performed in 3 out of 10 locations), the underground reservoir observation holes (at 18 locations) and the sea side observation holes (at 1 locations) on yesterday (April 23) are as follows.

No significant change was found with the analysis results from yesterday (April 23) compared to the day before yesterday (April 22). The result of the location where the sampling was first performed (underground reservoir observation hole A2, A5, A13, A16 and sea side observation hole(3)) showed the same level of the other observation holes.

The water level, etc. of the underground reservoirs will continue to be intensively monitored.

The following analysis results are also available on our web page.
URL: http://www.tepco.co.jp/en/nu/fukushima-np/f1/smp/index-e.html

- Drain hole (northeast) of the underground reservoir No.1
Sampling performed at 5:30 AM on April 23
Chloride concentration: 16ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 3.2x10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.8x10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.7x10^-2Bq/cm³)
All β: 3.3x10¹Bq/cm³

- Drain hole (southwest) of the underground reservoir No.1
Sampling performed at 5:30 AM on April 23
Chloride concentration: 5ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.7x10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 4.7x10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.8x10^-2Bq/cm³)
All β: Below the detection limit (Detection limit: 3.2x10^-2Bq/cm³)

- Drain hole (northeast) of the underground reservoir No.2
Sampling performed at 5:40 AM on April 23
Chloride concentration: 9ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.7x10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.3x10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.9x10^-2Bq/cm³)
All β: 1.3x10¹Bq/cm³

- Drain hole (southwest) of the underground reservoir No.2
Sampling performed at 5:40 AM on April 23
Chloride concentration: 6ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.6x10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.0x10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.6x10^-2Bq/cm³)
All β: 2.5x10^-1Bq/cm³

- Drain hole (northeast) of the underground reservoir No.3
Sampling performed at 5:50 AM on April 23
Chloride concentration: 7ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 3.0x10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.6x10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 7.0x10^-2Bq/cm³)
All β: 4.5x10^-2Bq/cm³

- Drain hole (southwest) of the underground reservoir No.3
Sampling performed at 5:50 AM on April 23
Chloride concentration: 4ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.5x10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.5x10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.7x10^-2Bq/cm³)
All β: 1.2x10^-1Bq/cm³

- Drain hole (northeast) of the underground reservoir No.4
Sampling performed at 6:00 AM on April 23
Chloride concentration: 10ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.8x10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.3x10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.8x10^-2Bq/cm³)
All β: Below the detection limit (Detection limit: 3.2x10^-2Bq/cm³)

- Drain hole (southwest) of the underground reservoir No.4
Sampling performed at 6:00 AM on April 23
Chloride concentration: 8ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.5x10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 4.8x10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.8x10^-2Bq/cm³)
All β: 3.3x10^-2Bq/cm³

- Drain hole (northeast) of the underground reservoir No.5
Sampling performed at 6:10 AM on April 23
Chloride concentration: 8ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.7x10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 4.9x10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.9x10^-2Bq/cm³)
All β: 4.0x10^-1Bq/cm³

- Drain hole (southwest) of the underground reservoir No.5
Sampling performed at 6:10 AM on April 23
Chloride concentration: 8ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.6x10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.3x10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.6x10^-2Bq/cm³)
All β: Below the detection limit (Detection limit: 3.2x10^-2Bq/cm³)

- Drain hole (northeast) of the underground reservoir No.6
Sampling performed at 6:20 AM on April 23
Chloride concentration: 10ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.0x10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.5x10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.7x10^-2Bq/cm³)
All β: Below the detection limit (Detection limit: 3.2x10^-2Bq/cm³)

- Drain hole (southwest) of the underground reservoir No.6
Sampling performed at 6:20 AM on April 23
Chloride concentration: 7ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.5x10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.5x10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.7x10^-2Bq/cm³)
All β: 5.4x10^-2Bq/cm³

- Drain hole (northeast) of the underground reservoir No.7
Sampling performed at 6:30 AM on April 23
Chloride concentration: 6ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.6x10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.0x10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.7x10^-2Bq/cm³)
All β: 3.3x10^-2Bq/cm³

- Drain hole (southwest) of the underground reservoir No.7
Sampling performed at 6:30 AM on April 23
Chloride concentration: 8ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.7x10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.3x10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.8x10^-2Bq/cm³)
All β: Below the detection limit (Detection limit: 3.2x10^-2Bq/cm³)

- Leakage detection hole (northeast) of the underground reservoir No.1
Sampling performed at 8:15 AM on April 23
Chloride concentration: 1100ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 1.9x10^-1Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 2.5x10^-1Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 1.2x10^-1Bq/cm³)
Antimony 125: 2.8x10¹Bq/cm³
Ruthenium 106: 1.9x10⁰Bq/cm³
All β: 3.4x10⁴Bq/cm³

- Leakage detection hole (southwest) of the underground reservoir No.1
Sampling performed at 8:20 AM on April 23
Chloride concentration: 8ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.4x10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.0x10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.7x10^-2Bq/cm³)
All β: 4.1x10^-1Bq/cm³

- Leakage detection hole (northeast) of the underground reservoir No.2
Sampling performed at 8:30 AM on April 23
Chloride concentration: 22ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 3.7x10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.6x10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 7.1x10^-2Bq/cm³)
All β: 6.4x10²Bq/cm³

- Leakage detection hole (southwest) of the underground reservoir No.2
Sampling performed at 8:35 AM on April 23
Chloride concentration: 11ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.4x10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.0x10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.6x10^-2Bq/cm³)
All β: 8.9x10^-1Bq/cm³

- Leakage detection hole (northeast) of the underground reservoir No.3
*Sampling was not performed since the amount of sample necessary for analysis could not be obtained.

- Leakage detection hole (southwest) of the underground reservoir No.3
Sampling performed at 8:53 AM on April 23
Chloride concentration: 18ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.2x10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.1x10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.6x10^-2Bq/cm³)
All β: 9.9x10¹Bq/cm³

- Leakage detection hole (northeast) of the underground reservoir No.4
Sampling performed at 9:10 AM on April 23
Chloride concentration: 11ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.9x10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.5x10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.7x10^-2Bq/cm³)
All β: 1.5x10^-1Bq/cm³

- Leakage detection hole (southwest) of the underground reservoir No.4
*Sampling was not performed since the amount of sample necessary for analysis could not be obtained.

- Leakage detection hole (northeast) of the underground reservoir No.6
Sampling performed at 9:25 AM on April 23
Chloride concentration: 8ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 3.1x10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.0x10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.7x10^-2Bq/cm³)
All β: 1.9x10^-1Bq/cm³

- Leakage detection hole (southwest) of the underground reservoir No.6
*Sampling was not performed since the amount of sample necessary for analysis could not be obtained.

- Observation hole (near the underground reservoirs No.1-3) A2
Sampling performed at 9:03 AM on April 23
Chloride concentration: 9ppm
All β: Below the detection limit (Detection limit: 2.6x10^-2Bq/cm³)

- Observation hole (near the underground reservoirs No.1-3) A3
Sampling performed at 11:15 AM on April 23
Chloride concentration: 8ppm
All β: Below the detection limit (Detection limit: 2.6x10^-2Bq/cm³)

- Observation hole (near the underground reservoirs No.1-3) A4
Sampling performed at 10:50 AM on April 23
Chloride concentration: 8ppm
All β: Below the detection limit (Detection limit: 2.6x10^-2Bq/cm³)

- Observation hole (near the underground reservoirs No.1-3) A5
Sampling performed at 11:15 AM on April 23
Chloride concentration: 6ppm
All β: Below the detection limit (Detection limit: 2.6x10^-2Bq/cm³)

- Observation hole (near the underground reservoirs No.1-3) A8
Sampling performed at 9:50 AM on April 23
Chloride concentration: 8ppm
All β: Below the detection limit (Detection limit: 2.6x10^-2Bq/cm³)

- Observation hole (near the underground reservoirs No.1-3) A9
Sampling performed at 9:22 AM on April 23
Chloride concentration: 8ppm
All β: Below the detection limit (Detection limit: 2.6x10^-2Bq/cm³)

- Observation hole (near the underground reservoirs No.1-3) A10
Sampling performed at 9:24 AM on April 23
Chloride concentration: 9ppm
All β: Below the detection limit (Detection limit: 2.6x10^-2Bq/cm³)

- Observation hole (near the underground reservoirs No.1-3) A11
Sampling performed at 9:37 AM on April 23
Chloride concentration: 31ppm
All β: Below the detection limit (Detection limit: 2.6x10^-2Bq/cm³)

- Observation hole (near the underground reservoirs No.1-3) A12
Sampling performed at 9:50 AM on April 23
Chloride concentration: 8ppm
All β: Below the detection limit (Detection limit: 2.6x10^-2Bq/cm³)

- Observation hole (near the underground reservoirs No.1-3) A13
Sampling performed at 10:21 AM on April 23
Chloride concentration: 9ppm
All β: Below the detection limit (Detection limit: 2.6x10^-2Bq/cm³)

- Observation hole (near the underground reservoirs No.1-3) A14
Sampling performed at 10:21 AM on April 23
Chloride concentration: 9ppm
All β: Below the detection limit (Detection limit: 2.6x10^-2Bq/cm³)

- Observation hole (near the underground reservoirs No.1-3) A15
Sampling performed at 11:36 AM on April 23
Chloride concentration: 9ppm
All β: Below the detection limit (Detection limit: 2.6x10^-2Bq/cm³)

- Observation hole (near the underground reservoirs No.1-3) A16
Sampling performed at 10:31 AM on April 23
Chloride concentration: 11ppm
All β: Below the detection limit (Detection limit: 3.2x10^-2Bq/cm³)

- Observation hole (near the underground reservoirs No.1-3) A18
Sampling performed at 9:45 AM on April 23
Chloride concentration: 11ppm
All β: Below the detection limit (Detection limit: 3.2x10^-2Bq/cm³)

- Observation hole (near the underground reservoirs No.1-3) A19
Sampling performed at 9:23 AM on April 23
Chloride concentration: 9ppm
All β: Below the detection limit (Detection limit: 3.2x10^-2Bq/cm³)

The observation holes (near the underground reservoirs No.1-3) A1, A6, A7 and A17 are currently being drilled.

- Observation hole (near the underground reservoirs No.6) B1
Sampling performed at 10:45 AM on April 23
Chloride concentration: 12ppm
All β: Below the detection limit (Detection limit: 3.2x10^-2Bq/cm³)

- Observation hole (near the underground reservoirs No.6) B2
Sampling performed at 11:20 AM on April 23
Chloride concentration: 5ppm
All β: Below the detection limit (Detection limit: 3.2x10^-2Bq/cm³)

- Observation hole (near the underground reservoirs No.6) B3
Sampling performed at 10:50 AM on April 23
Chloride concentration: 7ppm
All β: Below the detection limit (Detection limit: 3.2x10^-2Bq/cm³)

- Sea side observation hole (3)
Sampling performed at 1:19 PM on April 23
Chloride concentration: Below the detection limit (Detection limit: 1ppm)
Tritium: Under analysis
All β: Below the detection limit (Detection limit: 3.2x10^-2Bq/cm³)

The sea side observation holes (4), (5), (6), (7) and (8) are currently being drilled.
The results of the sea side observation holes (1) and (2) were announced on April 23.