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 the sampling performed in the leakage detection holes (at 2 locations) and the drain holes (at 2 locations) of the underground reservoir No.1 in the morning on April 9 are as follows.

- Water in the leakage detection hole (in the northeast side) of the underground reservoir No.1
Sampling performed at 8:35 AM on April 9
Chloride concentration: 910ppm
Iodine 131: Below the detection limit (1.3×10^-1 Bq/cm³)
Cesium 134: Below the detection limit (1.8×10^-1 Bq/cm³)
Cesium 137: Below the detection limit (9.7×10^-2 Bq/cm³)
Antimony 125: 1.8×10¹ Bq/cm³
Ruthenium 106: 1.2×10⁰ Bq/cm³
All β: 1.0×10⁴ Bq/cm³

- Water in the leakage detection hole (in the southwest side) of the underground reservoir No.1
Sampling performed at 8:30 AM on April 9
Chloride concentration: 8ppm
Iodine 131: Below the detection limit (2.8×10^-2 Bq/cm³)
Cesium 134: Below the detection limit (5.0×10^-2 Bq/cm³)
Cesium 137: Below the detection limit (6.9×10^-2 Bq/cm³)
Antimony 125: 1.8×10¹ Bq/cm³
Ruthenium 106: 1.2×10⁰ Bq/cm³
All β: 5.3×10^-2 Bq/cm³ (newly reported)

- Water in the drain hole (in the northeast side) of the underground reservoir No.1
Sampling performed at 6:30 AM on April 9
Chloride concentration: 12ppm
Iodine 131: Below the detection limit (2.9×10^-2 Bq/cm³)
Cesium 134: Below the detection limit (5.0×10^-2 Bq/cm³)
Cesium 137: Below the detection limit (6.9×10^-2 Bq/cm³)
All β: Below the detection limit (3.2×10^-2 Bq/cm³) (newly reported)

- Water in the drain hole (in the southwest side) of the underground reservoir No.1
Sampling performed at 6:30 AM on April 9
Chloride concentration: 7ppm
Iodine 131: Below the detection limit (2.8×10^-2 Bq/cm³)
Cesium 134: Below the detection limit (5.1×10^-2 Bq/cm³)
Cesium 137: Below the detection limit (6.8×10^-2 Bq/cm³)
All β: Below the detection limit (3.2×10^-2 Bq/cm³) (newly reported)