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) 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 17) morning are as follows.

The results of sampling performed yesterday (April 17) in the observation holes of the underground reservoir (at 3 locations) are also provided below.

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 5:10 AM on April 17
Chloride concentration: 15ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.6×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.5×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.7×10^{^-2}Bq/cm³)
All β: 1.6×10^{^1}Bq/cm³

- Drain hole (southwest) of the underground reservoir No.1
Sampling performed at 5:10 AM on April 17
Chloride concentration: 6ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.4×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.0×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.5×10^{^-2}Bq/cm³)
All β: 2.5×10^{^-1}Bq/cm³

- Drain hole (northeast) of the underground reservoir No.2
Sampling performed at 5:20 AM on April 17
Chloride concentration: 9ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 3.3×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.2×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 7.2×10^{^-2}Bq/cm³)
All β: 3.0×10^{^1}Bq/cm³

- Drain hole (southwest) of the underground reservoir No.2
Sampling performed at 5:20 AM on April 17
Chloride concentration: 5ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.5×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 4.9×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 7.0×10^{^-2}Bq/cm³)
All β: 4.4×10^{^-2}Bq/cm³

- Drain hole (northeast) of the underground reservoir No.3
Sampling performed at 5:30 AM on April 17
Chloride concentration: 7ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.7×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.1×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.7×10^{^-2}Bq/cm³)
All β: 1.3×10^{^-1}Bq/cm³

- Drain hole (southwest) of the underground reservoir No.3
Sampling performed at 5:30 AM on April 17
Chloride concentration: 4ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.6×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.1×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.8×10^{^-2}Bq/cm³)
All β: 2.9×10^{^-1}Bq/cm³

- Drain hole (northeast) of the underground reservoir No.4
Sampling performed at 5:40 AM on April 17
Chloride concentration: 8ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.6×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.4×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.6×10^{^-2}Bq/cm³)
All β: 4.5×10^{^-2}Bq/cm³

- Drain hole (southwest) of the underground reservoir No.4
Sampling performed at 5:40 AM on April 17
Chloride concentration: 8ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.7×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.0×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.6×10^{^-2}Bq/cm³)
All β: 4.6×10^{^-2}Bq/cm³

- Drain hole (northeast) of the underground reservoir No.5
Sampling performed at 5:45 AM on April 17
Chloride concentration: 5ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.8×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.0×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 7.0×10^{^-2}Bq/cm³)
All β: 4.5×10^{^-1}Bq/cm³

- Drain hole (southwest) of the underground reservoir No.5
Sampling performed at 5:45 AM on April 17
Chloride concentration: 8ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.4×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 4.9×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.6×10^{^-2}Bq/cm³)
All β: 4.1×10^{^-2}Bq/cm³

- Drain hole (northeast) of the underground reservoir No.6
Sampling performed at 6:00 AM on April 17
Chloride concentration: 11ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 3.4×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.2×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.7×10^{^-2}Bq/cm³)
All β: 8.3×10^{^-2}Bq/cm³

- Drain hole (southwest) of the underground reservoir No.6
Sampling performed at 6:00 AM on April 17
Chloride concentration: 7ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.5×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.0×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.6×10^{^-2}Bq/cm³)
All β: 1.2×10^{^-1}Bq/cm³

- Drain hole (northeast) of the underground reservoir No.7
Sampling performed at 6:10 AM on April 17
Chloride concentration: 6ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.5×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.2×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 7.1×10^{^-2}Bq/cm³)
All β: 3.9×10^{^-2}Bq/cm³

- Drain hole (southwest) of the underground reservoir No.7
Sampling performed at 6:10 AM on April 17
Chloride concentration: 7ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.9×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.3×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.9×10^{^-2}Bq/cm³)
All β: 2.1×10^{^-2}Bq/cm³

- Leakage detection hole (northeast) of the underground reservoir No.1
Sampling performed at 8:19 AM on April 17
Chloride concentration: 1250ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.0×10^{^-1}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 2.5×10^{^-1}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 1.2×10^{^-1}Bq/cm³)
Antimony 125: 2.8×10^{^1}Bq/cm³
Ruthenium 106: 1.7×10^{^0}Bq/cm³
All β: 3.5×10^{^4}Bq/cm³

- Leakage detection hole (southwest) of the underground reservoir No.1
Sampling performed at 8:26 AM on April 17
Chloride concentration: 7ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.8×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 4.9×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.8×10^{^-2}Bq/cm³)
All β: 1.3×10^{^-1}Bq/cm³

- Leakage detection hole (northeast) of the underground reservoir No.2
Sampling performed at 8:35 AM on April 17
Chloride concentration: 44ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 4.4×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.6×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 7.1×10^{^-2}Bq/cm³)
All β: 1.3×10^{^3}Bq/cm³

- Leakage detection hole (southwest) of the underground reservoir No.2
Sampling performed at 8:40 AM on April 17
Chloride concentration: 9ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.5×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.3×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.6×10^{^-2}Bq/cm³)
All β: 1.2×10^{^0}Bq/cm³

- Leakage detection hole (northeast) of the underground reservoir No.3
Sampling performed at 8:50 AM on April 17
Chloride concentration: 9ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.5×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.3×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.7×10^{^-2}Bq/cm³)
All β: 2.7×10^{^0}Bq/cm³

- Leakage detection hole (southwest) of the underground reservoir No.3
Sampling performed at 8:52 AM on April 17
Chloride concentration: 32ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 3.1×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.3×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.7×10^{^-2}Bq/cm³)
All β: 2.3×10^{^2}Bq/cm³

- Leakage detection hole (northeast) of the underground reservoir No.4
Sampling performed at 9:08 AM on April 17
Chloride concentration: 9ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.7×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.3×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.9×10^{^-2}Bq/cm³)
All β: 4.1×10^{^-1}Bq/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 17
Chloride concentration: 6ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.8×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 4.9×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.7×10^{^-2}Bq/cm³)
All β: 9.0×10^{^-2}Bq/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) A8
Sampling performed at 10:35 AM on April 17
Chloride concentration: 9ppm
All β: Below the detection limit (Detection limit: 1.2×10^{^-2}Bq/cm³)

- Observation hole (near the underground reservoirs No.1-3) A11
Sampling performed at 1:35 PM on April 17
Chloride concentration: 32ppm
All β: Below the detection limit (Detection limit: 9.2×10^{^-3}Bq/cm³)

- Observation hole (near the underground reservoirs No.1-3) A18
Sampling performed at 3:06 PM on April 17
Chloride concentration: 9ppm
All β: Below the detection limit (Detection limit: 9.2×10^{^-3}Bq/cm³)

The observation holes (near the underground reservoirs No.1-3) A5, A9 and A10 are currently being drilled.

The observation hole (near the underground reservoir No.6) B1 is currently being drilled.

The observation holes 1-4 on the sea side are currently being drilled.