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) today (April 10) are as follows.

Similarly to the chloride concentration, no significant change in the all β density was found in the results compared to the previous day (April 9).

Please refer to the document on iodine and cesium radioactivity analysis results available in our web page. (The following analysis results will be available on the web page once preparation is complete.)
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 11:20 AM on April 10
Chloride concentration: 12ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.8×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.1×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 7.2×10^-2Bq/cm³)
All β: 9.9×10^-2Bq/cm³ (Detection limit: 3.0×10^-2Bq/cm³)

- Drain hole (southwest) of the underground reservoir No.1
Sampling performed at 11:20 AM on April 10
Chloride concentration: 6ppm (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: 6.8×10^-2Bq/cm³)
All β: 5.2×10^-2Bq/cm³ (Detection limit: 3.0×10^-2Bq/cm³)

- Drain hole (northeast) of the underground reservoir No.2
Sampling performed at 7:40 AM on April 10
Chloride concentration: 14ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 3.2×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.1×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 7.0×10^-2Bq/cm³)
All β: 5.5×10¹Bq/cm³ (Detection limit: 3.2×10^-2Bq/cm³)

- Drain hole (southwest) of the underground reservoir No.2
Sampling performed at 7:50 AM on April 10
Chloride concentration: 7ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.1×10^-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: 1.1×10^-1Bq/cm³ (Detection limit: 3.2×10^-2Bq/cm³)

- Drain hole (northeast) of the underground reservoir No.3
Sampling performed at 7:30 AM on April 10
Chloride concentration: 6ppm (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: 6.9×10^-2Bq/cm³)
All β: Below the detection limit (Detection limit: 3.2×10^-2Bq/cm³)

- Drain hole (southwest) of the underground reservoir No.3
Sampling performed at 7:10 AM on April 10
Chloride concentration: 4ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.2×10^-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: Below the detection limit (Detection limit: 3.2×10^-2Bq/cm³)

- Drain hole (northeast) of the underground reservoir No.4
Sampling performed at 7:20 AM on April 10
Chloride concentration: 9ppm (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: Below the detection limit (Detection limit: 3.0×10^-2Bq/cm³)

- Drain hole (southwest) of the underground reservoir No.4
Sampling performed at 7:05 AM on April 10
Chloride concentration: 8ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.5×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.1×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.5×10^-2Bq/cm³)
All β: Below the detection limit (Detection limit: 3.0×10^-2Bq/cm³)

- Drain hole (northeast) of the underground reservoir No.5
Sampling performed at 6:10 AM on April 10
Chloride concentration: 5ppm (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: 6.9×10^-2Bq/cm³)
All β: 1.6×10^-1Bq/cm³ (Detection limit: 3.0×10^-2Bq/cm³)

- Drain hole (southwest) of the underground reservoir No.5
Sampling performed at 6:20 AM on April 10
Chloride concentration: 7ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.5×10^-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: Below the detection limit (Detection limit: 3.0×10^-2Bq/cm³)

- Drain hole (northeast) of the underground reservoir No.6
Sampling performed at 6:50 AM on April 10
Chloride concentration: 11ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.8×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.5×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 7.0×10^-2Bq/cm³)
All β: Below the detection limit (Detection limit: 3.2×10^-2Bq/cm³)

- Drain hole (southwest) of the underground reservoir No.6
Sampling performed at 7:00 AM on April 10
Chloride concentration: 6ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.3×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.2×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.8×10^-2Bq/cm³)
All β: 4.5×10^-2Bq/cm³ (Detection limit: 3.2×10^-2Bq/cm³)

- Drain hole (northeast) of the underground reservoir No.7
Sampling performed at 6:00 AM on April 10
Chloride concentration: 6ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.6×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.4×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.8×10^-2Bq/cm³)
All β: Below the detection limit (Detection limit: 3.2×10^-2Bq/cm³)

- Drain hole (southwest) of the underground reservoir No.7
Sampling performed at 5:50 AM on April 10
Chloride concentration: 10ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 3.5×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.3×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.9×10^-2Bq/cm³)
All β: 4.5×10^-2Bq/cm³ (Detection limit: 3.2×10^-2Bq/cm³)

- Leakage detection hole (northeast) of the underground reservoir No.1
Sampling performed at 7:40 AM on April 10
Chloride concentration: 1100ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 1.9×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 2.5×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 1.4×10^-2Bq/cm³)
All β: 2.3×10⁴Bq/cm³ (Detection limit: 3.2×10⁰Bq/cm³)

- Leakage detection hole (southwest) of the underground reservoir No.1
Sampling performed at 8:25 AM on April 10
Chloride concentration: 8ppm (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: 6.6×10^-2Bq/cm³)
All β: Below the detection limit (Detection limit: 3.2×10^-2Bq/cm³)

- Leakage detection hole (northeast) of the underground reservoir No.2
Sampling performed at 9:15 AM on April 10
Chloride concentration: 300ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 1.1×10^-1Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 8.5×10^-2Bq/cm³)
Cesium 137: 1.1×10^-1Bq/cm³ (Detection limit: 9.7×10^-2Bq/cm³)
All β: 5.4×10³Bq/cm³ (Detection limit: 3.2×10⁰Bq/cm³)

- Leakage detection hole (southwest) of the underground reservoir No.2
Sampling performed at 9:00 AM on April 10
Chloride concentration: 11ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 3.1×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.6×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.8×10^-2Bq/cm³)
All β: 1.3×10⁰Bq/cm³ (Detection limit: 3.2×10^-2Bq/cm³)

- Leakage detection hole (northeast) of the underground reservoir No.3
Sampling performed at 9:25 AM on April 10
Chloride concentration: 2ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.2×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.0×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.9×10^-2Bq/cm³)
All β: Below the detection limit (Detection limit: 3.2×10^-2Bq/cm³)

- Leakage detection hole (southwest) of the underground reservoir No.3
Sampling performed at 9:47 AM on April 10
Chloride concentration: 280ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 6.0×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 6.5×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 7.3×10^-2Bq/cm³)
All β: 1.2×10³Bq/cm³ (Detection limit: 3.2×10⁰Bq/cm³)

- Leakage detection hole (northeast) of the underground reservoir No.4
Sampling performed at 10:00 AM on April 10
Chloride concentration: 11ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 3.1×10^-2Bq/cm³)
Cesium 134: Below the detection limit (Detection limit: 5.3×10^-2Bq/cm³)
Cesium 137: Below the detection limit (Detection limit: 6.9×10^-2Bq/cm³)
All β: Below the detection limit (Detection limit: 3.2×10^-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 10:30 AM on April 10
Chloride concentration: 7ppm (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: Below the detection limit (Detection limit: 3.2×10^-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.