Top > Releases ･ Announcements > Fukushima Daiichi NPS Prompt Report > 2013 > Water Leak from the Underground Reservoirs in Fukushima Daiichi Nuclear Power Station (Follow-up Information No.76)
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 19) morning are as follows.
The results of sampling performed yesterday (April 19) 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 5:30 AM on April 19
Chloride concentration: 14ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 3.1×10-2Bq/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: 2.1×11Bq/cm3
- Drain hole (southwest) of the underground reservoir No.1
Sampling performed at 5:25 AM on April 19
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: 5.6×10-2Bq/cm3)
Cesium 137: Below the detection limit (Detection limit: 6.7×10-2Bq/cm3)
All β: 2.6×10-1Bq/cm3
- Drain hole (northeast) of the underground reservoir No.2
Sampling performed at 5:40 AM on April 19
Chloride concentration: 9ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.5×10-2Bq/cm3)
Cesium 134: Below the detection limit (Detection limit: 4.7×10-2Bq/cm3)
Cesium 137: Below the detection limit (Detection limit: 6.6×10-2Bq/cm3)
All β: 2.4×11Bq/cm3
- Drain hole (southwest) of the underground reservoir No.2
Sampling performed at 5:35 AM on April 19
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: 5.1×10-2Bq/cm3)
Cesium 137: Below the detection limit (Detection limit: 6.9×10-2Bq/cm3)
All β: 3.5×10-2Bq/cm3
- Drain hole (northeast) of the underground reservoir No.3
Sampling performed at 5:50 AM on April 19
Chloride concentration: 8ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.0×10-2Bq/cm3)
Cesium 134: Below the detection limit (Detection limit: 4.9×10-2Bq/cm3)
Cesium 137: Below the detection limit (Detection limit: 6.6×10-2Bq/cm3)
All β: 1.8×10-1Bq/cm3
- Drain hole (southwest) of the underground reservoir No.3
Sampling performed at 5:45 AM on April 19
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: 5.0×10-2Bq/cm3)
Cesium 137: Below the detection limit (Detection limit: 6.6×10-2Bq/cm3)
All β: 1.5×10-1Bq/cm3
- Drain hole (northeast) of the underground reservoir No.4
Sampling performed at 6:00 AM on April 19
Chloride concentration: 9ppm (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: 6.8×10-2Bq/cm3)
All β: 2.4×10-2Bq/cm3
- Drain hole (southwest) of the underground reservoir No.4
Sampling performed at 5:55 AM on April 19
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: 5.1×10-2Bq/cm3)
Cesium 137: Below the detection limit (Detection limit: 6.7×10-2Bq/cm3)
All β:3.5×10-2Bq/cm3
- Drain hole (northeast) of the underground reservoir No.5
Sampling performed at 6:05 AM on April 19
Chloride concentration: 6ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.4×10-2Bq/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: 4.0×10-1Bq/cm3
- Drain hole (southwest) of the underground reservoir No.5
Sampling performed at 6:00 AM on April 19
Chloride concentration: 6ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.4×10-2Bq/cm3)
Cesium 134: Below the detection limit (Detection limit: 4.9×10-2Bq/cm3)
Cesium 137: Below the detection limit (Detection limit: 7.0×10-2Bq/cm3)
All β: 5.7×10-2Bq/cm3
- Drain hole (northeast) of the underground reservoir No.6
Sampling performed at 6:10 AM on April 19
Chloride concentration: 10ppm (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: 6.6×10-2Bq/cm3)
All β: 8.3×10-2Bq/cm3
- Drain hole (southwest) of the underground reservoir No.6
Sampling performed at 6:15 AM on April 19
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: 5.5×10-2Bq/cm3)
Cesium 137: Below the detection limit (Detection limit: 6.7×10-2Bq/cm3)
All β: 1.1×10-1Bq/cm3
- Drain hole (northeast) of the underground reservoir No.7
Sampling performed at 6:20 AM on April 19
Chloride concentration: 5ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.8×10-2Bq/cm3)
Cesium 134: Below the detection limit (Detection limit: 4.7×10-2Bq/cm3)
Cesium 137: Below the detection limit (Detection limit: 6.7×10-2Bq/cm3)
All β: 3.5×10-2Bq/cm3
- Drain hole (southwest) of the underground reservoir No.7
Sampling performed at 6:25 AM on April 19
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: 5.3×10-2Bq/cm3)
Cesium 137: Below the detection limit (Detection limit: 6.7×10-2Bq/cm3)
All β: 4.6×10-2Bq/cm3
- Leakage detection hole (northeast) of the underground reservoir No.1
Sampling performed at 8:18 AM on April 19
Chloride concentration: 1200ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.1×10-1Bq/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: 2.9×11Bq/cm3
Ruthenium 106: 1.4×100Bq/cm3
All β: 3.6×14Bq/cm3
- Leakage detection hole (southwest) of the underground reservoir No.1
Sampling performed at 8:19 AM on April 19
Chloride concentration: 7ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.8×10-2Bq/cm3)
Cesium 134: Below the detection limit (Detection limit: 5.0×10-2Bq/cm3)
Cesium 137: Below the detection limit (Detection limit: 7.1×10-2Bq/cm3)
All β: 4.9×10-1Bq/cm3
- Leakage detection hole (northeast) of the underground reservoir No.2
Sampling performed at 8:35 AM on April 19
Chloride concentration: 20ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 3.9×10-2Bq/cm3)
Cesium 134: Below the detection limit (Detection limit: 5.4×10-2Bq/cm3)
Cesium 137: Below the detection limit (Detection limit: 7.0×10-2Bq/cm3)
All β: 7.2×10-1Bq/cm3
- Leakage detection hole (southwest) of the underground reservoir No.2
Sampling performed at 8:33 AM on April 19
Chloride concentration: 9ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.5×10-2Bq/cm3)
Cesium 134: Below the detection limit (Detection limit: 5.0×10-2Bq/cm3)
Cesium 137: Below the detection limit (Detection limit: 6.5×10-2Bq/cm3)
All β: 1.2×100Bq/cm3
- Leakage detection hole (northeast) of the underground reservoir No.3
Sampling performed at 8:50 AM on April 19
Chloride concentration: 8ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.3×10-2Bq/cm3)
Cesium 134: Below the detection limit (Detection limit: 4.7×10-2Bq/cm3)
Cesium 137: Below the detection limit (Detection limit: 6.5×10-2Bq/cm3)
All β: 5.0×10-1Bq/cm3
- Leakage detection hole (southwest) of the underground reservoir No.3
Sampling performed at 8:49 AM on April 19
Chloride concentration: 20ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 3.2×10-2Bq/cm3)
Cesium 134: Below the detection limit (Detection limit: 5.3×10-2Bq/cm3)
Cesium 137: Below the detection limit (Detection limit: 7.1×10-2Bq/cm3)
All β: 1.9×10-1Bq/cm3
- Leakage detection hole (northeast) of the underground reservoir No.4
Sampling performed at 9:05 AM on April 19
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: 2.5×10-1Bq/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 9:23 AM on April 19
Chloride concentration: 6ppm (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: 6.5×10-2Bq/cm3)
All β: 5.0×10-2Bq/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.
- Observation hole (near the underground reservoirs No.1-3) A8
Sampling performed at 9:51 AM on April 19
Chloride concentration: 8ppm
All β: Below the detection limit (Detection limit: 2.8×10-2Bq/cm3)
- Observation hole (near the underground reservoirs No.1-3) A11
Sampling performed at 12:57 PM on April 19
Chloride concentration: 30ppm
All β: Below the detection limit (Detection limit: 3.1×10-2Bq/cm3)
- Observation hole (near the underground reservoirs No.1-3) A18
Sampling performed at 2:42 PM on April 19
Chloride concentration: 10ppm
All β: Below the detection limit (Detection limit: 2.8×10-2Bq/cm3)
The observation holes (near the underground reservoirs No.1-3) A3, A4, A5, A9, A10, A12, A14, A15 and A19 are currently being drilled.
The observation holes (near the underground reservoir No.6) B1, B2 and B3 are currently being drilled.
© Tokyo Electric Power Company Holdings, Inc.
