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 all β density analysis of the samples collected in the drain holes of the underground reservoirs No.1-7 (at 14 locations) and the leakage detection holes of the underground reservoirs No.1-4 and 6 (sampling could not be performed in 2 out of 10 locations) yesterday (April 13) morning are as follows.

No significant change was found with the analysis results compared to the previous day (April 12) except for the all β density in the drain hole water (northeast) of the underground reservoir No.1 (announced yesterday).

Please refer to the document on iodine and cesium radioactivity analysis results available in 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 (Previously announced)
Sampling performed at 5:10 AM on April 13
Chloride concentration: 17ppm
Iodine 131: Below the detection limit (Detection limit: 2.9×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 4.9×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.8×10^-2Bq/cm³)
All β: 7.2×10⁰Bq/cm³

- Drain hole (southwest) of the underground reservoir No.1 (Previously announced)
Sampling performed at 5:10 AM on April 13
Chloride concentration: 8ppm
Iodine 131: Below the detection limit (Detection limit: 2.8×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.2×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.7×10^-2Bq/cm³)
All β: 2.8×10^-2Bq/cm³

- Drain hole (northeast) of the underground reservoir No.2
Sampling performed at 5:20 AM on April 13
Chloride concentration: 13ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.7×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.0×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.7×10^-2Bq/cm³)
All β: 5.8×10¹Bq/cm³

- Drain hole (southwest) of the underground reservoir No.2
Sampling performed at 5:20 AM on April 13
Chloride concentration: 8ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.6×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.2×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 7.0×10^-2Bq/cm³)
All β: 1.5×10^-1Bq/cm³)

- Drain hole (northeast) of the underground reservoir No.3
Sampling performed at 5:30 AM on April 13
Chloride concentration: 8ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.7×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 4.9×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.6×10^-2Bq/cm³)
All β: 9.2×10^-2Bq/cm³

- Drain hole (southwest) of the underground reservoir No.3
Sampling performed at 5:30 AM on April 13
Chloride concentration: 6ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 3.0×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.3×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.8×10^-2Bq/cm³)
All β: 2.0×10^-1Bq/cm³

- Drain hole (northeast) of the underground reservoir No.4
Sampling performed at 5:40 AM on April 13
Chloride concentration: 10ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.8×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.2×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.9×10^-2Bq/cm³)
All β: 7.6×10^-2Bq/cm³

- Drain hole (southwest) of the underground reservoir No.4
Sampling performed at 5:40 AM on April 13
Chloride concentration: 9ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 3.0×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 4.8×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.7×10^-2Bq/cm³)
All β: 4.1×10^-2Bq/cm³

- Drain hole (northeast) of the underground reservoir No.5
Sampling performed at 5:50 AM on April 13
Chloride concentration: 15ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 3.0×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 4.9×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.7×10^-2Bq/cm³)
All β: 5.5×10^-1Bq/cm³

- Drain hole (southwest) of the underground reservoir No.5
Sampling performed at 5:50 AM on April 13
Chloride concentration: 8ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.9×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.0×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.8×10^-2Bq/cm³)
All β: 3.5×10^-2Bq/cm³

- Drain hole (northeast) of the underground reservoir No.6
Sampling performed at 6:00 AM on April 13
Chloride concentration: 13ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.2×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 4.9×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.7×10^-2Bq/cm³)
All β: 6.1×10^-2Bq/cm³

- Drain hole (southwest) of the underground reservoir No.6
Sampling performed at 6:00 AM on April 13
Chloride concentration: 10ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.9×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.2×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 7.0×10^-2Bq/cm³)
All β: 7.0×10^-2Bq/cm³

- Drain hole (northeast) of the underground reservoir No.7
Sampling performed at 6:10 AM on April 13
Chloride concentration: 7ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 1.8×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.4×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.5×10^-2Bq/cm³)
All β: 1.8×10^-2Bq/cm³

- Drain hole (southwest) of the underground reservoir No.7
Sampling performed at 6:10 AM on April 13
Chloride concentration: 11ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 3.0×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.4×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.7×10^-2Bq/cm³)
All β: 1.8×10^-2Bq/cm³

- Leakage detection hole (northeast) of the underground reservoir No.1 (Previously announced)
Sampling performed at 9:00 AM on April 13
Chloride concentration: 1200ppm
Iodine 131: Below the detection limit (Detection limit: 1.8×10^-1Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 2.5×10^-1Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 1.4×10^-1Bq/cm³)
Antimony 125: 2.8×10¹Bq/cm³
Ruthenium 106: 1.1×10⁰Bq/cm³
All β: 2.4×10⁴Bq/cm³

- Leakage detection hole (southwest) of the underground reservoir No.1 (Previously announced)
Sampling performed at 8:45 AM on April 13
Chloride concentration: 8ppm
Iodine 131: Below the detection limit (Detection limit: 3.0×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.4×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.9×10^-2Bq/cm³)
All β: 1.9×10^-1Bq/cm³

- Leakage detection hole (northeast) of the underground reservoir No.2
Sampling performed at 9:20 AM on April 13
Chloride concentration: 120ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 6.7×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 6.7×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 8.1×10^-2Bq/cm³)
All β: 4.6×10³Bq/cm³

- Leakage detection hole (southwest) of the underground reservoir No.2
Sampling performed at 9:10 AM on April 13
Chloride concentration: 10ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.3×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.1×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.8×10^-2Bq/cm³)
All β: 1.5×10⁰Bq/cm³

- Leakage detection hole (northeast) of the underground reservoir No.3
Sampling performed at 9:45 AM on April 13
Chloride concentration: 10ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.8×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.4×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.6×10^-2Bq/cm³)
All β: 5.8×10^-2Bq/cm³

- Leakage detection hole (southwest) of the underground reservoir No.3
Sampling performed at 9:35 AM on April 13
Chloride concentration: 180ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 6.1×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 6.1×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 7.6×10^-2Bq/cm³)
All β: 1.5×10³Bq/cm³

- Leakage detection hole (northeast) of the underground reservoir No.4
Sampling performed at 10:00 AM on April 13
Chloride concentration: 11ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.4×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.0×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.8×10^-2Bq/cm³)
All β: 8.8×10^-2Bq/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 10:20 AM on April 13
Chloride concentration: 9ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 3.8×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.5×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.8×10^-2Bq/cm³)
All β: 5.2×10^-2Bq/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.

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