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 16) morning are as follows.

The results of sampling performed in the observation hole of the underground reservoir (at 1 location), the groundwater bypass investigation holes (at 3 locations) and the groundwater bypass pump wells (at 4 locations) on yesterday (April 16) afternoon 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 5:30 AM on April 16
Chloride concentration: 14ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.3×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 4.8×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.6×10^{^-2}Bq/cm³)
All β: 1.7×10^{^1}Bq/cm³

- Drain hole (southwest) of the underground reservoir No.1
Sampling performed at 5:30 AM on April 16
Chloride concentration: 5ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 3.1×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.0×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.8×10^{^-2}Bq/cm³)
All β: 3.5×10^{^-2}Bq/cm³

- Drain hole (northeast) of the underground reservoir No.2
Sampling performed at 5:40 AM on April 16
Chloride concentration: 9ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.8×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 4.7×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.8×10^{^-2}Bq/cm³)
All β: 3.5×10^{^1}Bq/cm³

- Drain hole (southwest) of the underground reservoir No.2
Sampling performed at 5:40 AM on April 16
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: 5.0×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.5×10^{^-2}Bq/cm³)
All β: 9.6×10^{^-2}Bq/cm³

- Drain hole (northeast) of the underground reservoir No.3
Sampling performed at 5:50 AM on April 16
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: 4.8×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.9×10^{^-2}Bq/cm³)
All β: 1.4×10^{^-1}Bq/cm³

- Drain hole (southwest) of the underground reservoir No.3
Sampling performed at 5:50 AM on April 16
Chloride concentration: 4ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.2×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 4.8×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.6×10^{^-2}Bq/cm³)
All β: 2.7×10^{^-1}Bq/cm³

- Drain hole (northeast) of the underground reservoir No.4
Sampling performed at 6:10 AM on April 16
Chloride concentration: 9ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.8×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.3×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 7.0×10^{^-2}Bq/cm³)
All β: 5.9×10^{^-2}Bq/cm³

- Drain hole (southwest) of the underground reservoir No.4
Sampling performed at 6:10 AM on April 16
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: 5.3×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.7×10^{^-2}Bq/cm³)
All β: 4.0×10^{^-2}Bq/cm³

- Drain hole (northeast) of the underground reservoir No.5
Sampling performed at 6:30 AM on April 16
Chloride concentration: 5ppm (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: 4.6×10^{^-1}Bq/cm³

- Drain hole (southwest) of the underground reservoir No.5
Sampling performed at 6:30 AM on April 16
Chloride concentration: 7ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.3×10^{^-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: 6.7×10^{^-2}Bq/cm³)
All β: 3.2×10^{^-2}Bq/cm³

- Drain hole (northeast) of the underground reservoir No.6
Sampling performed at 6:20 AM on April 16
Chloride concentration: 11ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.9×10^{^-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: 5.2×10^{^-2}Bq/cm³

- Drain hole (southwest) of the underground reservoir No.6
Sampling performed at 6:20 AM on April 16
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: 4.8×10^{^-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

- Drain hole (northeast) of the underground reservoir No.7
Sampling performed at 6:40 AM on April 16
Chloride concentration: 6ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.7×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.5×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.8×10^{^-2}Bq/cm³)
All β: 1.6×10^{^-2}Bq/cm³

- Drain hole (southwest) of the underground reservoir No.7
Sampling performed at 6:40 AM on April 16
Chloride concentration: 8ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.8×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.2×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.7×10^{^-2}Bq/cm³)
All β: 1.4×10^{^-2}Bq/cm³

- Leakage detection hole (northeast) of the underground reservoir No.1
Sampling performed at 8:23 AM on April 16
Chloride concentration: 1240ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 1.9×10^{^-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: 1.3×10^{^-1}Bq/cm³)
Antimony 125: 2.8×10^{^1}Bq/cm³
Ruthenium 106: 1.3×10^{^0}Bq/cm³
All β: 3.5×10^{^4}Bq/cm³

- Leakage detection hole (southwest) of the underground reservoir No.1
Sampling performed at 8:25 AM on April 16
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: 5.1×10^{^-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

- Leakage detection hole (northeast) of the underground reservoir No.2
Sampling performed at 8:35 AM on April 16
Chloride concentration: 60ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 5.7×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 6.1×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 7.6×10^{^-2}Bq/cm³)
All β: 2.2×10^{^3}Bq/cm³

- Leakage detection hole (southwest) of the underground reservoir No.2
Sampling performed at 8:37 AM on April 16
Chloride concentration: 9ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.4×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.4×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.8×10^{^-2}Bq/cm³)
All β: 1.6×10^{^0}Bq/cm³

- Leakage detection hole (northeast) of the underground reservoir No.3
Sampling performed at 8:54 AM on April 16
Chloride concentration: 9ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.8×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.1×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 7.1×10^{^-2}Bq/cm³)
All β: 3.4×10^{^0}Bq/cm³

- Leakage detection hole (southwest) of the underground reservoir No.3
Sampling performed at 8:56 AM on April 16
Chloride concentration: 24ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.7×10^{^-2}Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.5×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.7×10^{^-2}Bq/cm³)
All β: 2.1×10^{^2}Bq/cm³

- Leakage detection hole (northeast) of the underground reservoir No.4
Sampling performed at 9:27 AM on April 16
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: 5.1×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.7×10^{^-2}Bq/cm³)
All β: 5.9×10^{^-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 9:45 AM on April 16
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: 5.2×10^{^-2}Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.5×10^{^-2}Bq/cm³)
All β: 1.6×10^{^-1}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 12:50 PM on April 16
Chloride concentration: 9ppm
All β: Below the detection limit (Detection limit: 9.2×10^{^-3}Bq/cm³)

- Observation holes (near the underground reservoirs No.1-3) A11 and A18 are currently being drilled.

- Groundwater bypass investigation hole (a)
Sampling performed at 3:47 PM on April 16
Chloride concentration: 17ppm
Tritium: Under analysis
All β: Below the detection limit (Detection limit: 1.1×10^{^-2}Bq/cm³)

- Groundwater bypass investigation hole (b)
Sampling performed at 4:45 PM on April 16
Chloride concentration: 9ppm
Tritium: Under analysis
All β: Below the detection limit (Detection limit: 1.1×10^{^-2}Bq/cm³)

- Groundwater bypass investigation hole (c)
Sampling performed at 5:23 PM on April 16
Chloride concentration: 11ppm
Tritium: Under analysis
All β: Below the detection limit (Detection limit: 1.1×10^{^-2}Bq/cm³)

- Groundwater bypass pump well (1)
Sampling performed at 12:15 PM on April 16
Chloride concentration: 46ppm
Tritium: Under analysis
All β: Below the detection limit (Detection limit: 7.9×10^{^-3}Bq/cm³)

- Groundwater bypass pump well (2)
Sampling performed at 12:20 PM on April 16
Chloride concentration: 25ppm
Tritium: Under analysis
All β: Below the detection limit (Detection limit: 7.9×10^{^-3}Bq/cm³)

- Groundwater bypass pump well (3)
Sampling performed at 12:25 PM on April 16
Chloride concentration: 63ppm
Tritium: Under analysis
All β: Below the detection limit (Detection limit: 7.9×10^{^-3}Bq/cm³)

- Groundwater bypass pump well (4)
Sampling performed at 12:30 PM on April 16
Chloride concentration: 18ppm
Tritium: Under analysis
All β: Below the detection limit (Detection limit: 7.9×10^{^-3}Bq/cm³)

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