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.86)
This is follow-up information regarding the water leak from the underground reservoirs at Fukushima Daiichi NPS.
The analysis results of tritium sampled in the groundwater bypass investigation holes (at 3 locations) and the groundwater bypass pump wells (at 4 locations) on April 16 are as follows.
The results of sampling performed in the drain holes of the underground reservoirs No.1-7 (at 14 locations), the leakage detection holes of the underground reservoirs No.1-4 and 6 (sampling could not be performed in 2 out of 10 locations), the groundwater bypass investigation holes (at 3 locations), the groundwater bypass pump wells (at 4 locations) and the sea side observation holes (at 2 locations) on yesterday (April 22) are also provided below.
No significant change was found with the analysis results from yesterday (April 22) compared to the day before yesterday (April 21).
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
<Sampling as of April 16>
- Groundwater bypass investigation hole (a)
Sampling performed at 3:47 PM on April 16
Chloride concentration: 17ppm (Previously announced)
Tritium: Below the detection limit (Detection limit: 2.6×10-1Bq/cm3)
All β: Below the detection limit (Detection limit: 1.1×10-2Bq/cm3) (Previously announced)
- Groundwater bypass investigation hole (b)
Sampling performed at 4:45 PM on April 16
Chloride concentration: 9ppm (Previously announced)
Tritium: Below the detection limit (Detection limit: 2.6×10-1Bq/cm3)
All β: Below the detection limit (Detection limit: 1.1×10-2Bq/cm3) (Previously announced)
- Groundwater bypass investigation hole (c)
Sampling performed at 5:23 PM on April 16
Chloride concentration: 11ppm (Previously announced)
Tritium: Below the detection limit (Detection limit: 2.6×10-1Bq/cm3)
All β: Below the detection limit (Detection limit: 1.1×10-2Bq/cm3) (Previously announced)
- Groundwater bypass pump well (1)
Sampling performed at 12:15 PM on April 16
Chloride concentration: 46ppm (Previously announced)
Tritium: Below the detection limit (Detection limit: 2.3×10-1Bq/cm3)
All β: Below the detection limit (Detection limit: 7.9×10-3Bq/cm3) (Previously announced)
- Groundwater bypass pump well (2)
Sampling performed at 12:20 PM on April 16
Chloride concentration: 25ppm (Previously announced)
Tritium: Below the detection limit (Detection limit: 2.3×10-1Bq/cm3)
All β: Below the detection limit (Detection limit: 7.9×10-3Bq/cm3) (Previously announced)
- Groundwater bypass pump well (3)
Sampling performed at 12:25 PM on April 16
Chloride concentration: 63ppm (Previously announced)
Tritium: Below the detection limit (Detection limit: 2.3×10-1Bq/cm3)
All β: Below the detection limit (Detection limit: 7.9×10-3Bq/cm3) (Previously announced)
- Groundwater bypass pump well (4)
Sampling performed at 12:30 PM on April 16
Chloride concentration: 18ppm (Previously announced)
Tritium: Below the detection limit (Detection limit: 2.3×10-1Bq/cm3)
All β: Below the detection limit (Detection limit: 7.9×10-3Bq/cm3) (Previously announced)
<Sampling as of April 22>
- Drain hole (northeast) of the underground reservoir No.1
Sampling performed at 5:20 AM on April 22
Chloride concentration: 17ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 3.2×10-2Bq/cm3)
Cesium 134: Below the detection limit (Detection limit: 5.5×10-2Bq/cm3)
Cesium 137: Below the detection limit (Detection limit: 6.5×10-2Bq/cm3)
All β: 3.1×101Bq/cm3
- Drain hole (southwest) of the underground reservoir No.1
Sampling performed at 5:20 AM on April 22
Chloride concentration: 6ppm (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: 6.8×10-2Bq/cm3)
All β: 9.1×10-2Bq/cm3
- Drain hole (northeast) of the underground reservoir No.2
Sampling performed at 5:30 AM on April 22
Chloride concentration: 10ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.5×10-2Bq/cm3)
Cesium 134: Below the detection limit (Detection limit: 5.4×10-2Bq/cm3)
Cesium 137: Below the detection limit (Detection limit: 6.5×10-2Bq/cm3)
All β: 1.5×101Bq/cm3
- Drain hole (southwest) of the underground reservoir No.2
Sampling performed at 5:30 AM on April 22
Chloride concentration: 8ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.9×10-2Bq/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: 3.7×10-2Bq/cm3
- Drain hole (northeast) of the underground reservoir No.3
Sampling performed at 5:40 AM on April 22
Chloride concentration: 10ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.6×10-2Bq/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: 5.0×10-2Bq/cm3
- Drain hole (southwest) of the underground reservoir No.3
Sampling performed at 5:40 AM on April 22
Chloride concentration: 4ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.6×10-2Bq/cm3)
Cesium 134: Below the detection limit (Detection limit: 5.1×10-2Bq/cm3)
Cesium 137: Below the detection limit (Detection limit: 6.8×10-2Bq/cm3)
All β: 5.0×10-2Bq/cm3
- Drain hole (northeast) of the underground reservoir No.4
Sampling performed at 5:45 AM on April 22
Chloride concentration: 10ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.3×10-2Bq/cm3)
Cesium 134: Below the detection limit (Detection limit: 4.9×10-2Bq/cm3)
Cesium 137: Below the detection limit (Detection limit: 6.8×10-2Bq/cm3)
All β: 3.1×10-2Bq/cm3
- Drain hole (southwest) of the underground reservoir No.4
Sampling performed at 5:45 AM on April 22
Chloride concentration: 9ppm (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: 6.9×10-2Bq/cm3)
All β: 3.1×10-2Bq/cm3
- Drain hole (northeast) of the underground reservoir No.5
Sampling performed at 6:25 AM on April 22
Chloride concentration: 13ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.4×10-2Bq/cm3)
Cesium 134: Below the detection limit (Detection limit: 5.2×10-2Bq/cm3)
Cesium 137: Below the detection limit (Detection limit: 6.6×10-2Bq/cm3)
All β: 3.2×10-1Bq/cm3
- Drain hole (southwest) of the underground reservoir No.5
Sampling performed at 6:25 AM on April 22
Chloride concentration: 10ppm (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: 6.8×10-2Bq/cm3)
All β: Below the detection limit (3.1×10-2Bq/cm3)
- Drain hole (northeast) of the underground reservoir No.6
Sampling performed at 6:25 AM on April 22
Chloride concentration: 11ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.5×10-2Bq/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: 3.1×10-2Bq/cm3
- Drain hole (southwest) of the underground reservoir No.6
Sampling performed at 6:25 AM on April 22
Chloride concentration: 10ppm (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: 6.5×10-2Bq/cm3)
All β: 3.7×10-2Bq/cm3
- Drain hole (northeast) of the underground reservoir No.7
Sampling performed at 6:25 AM on April 22
Chloride concentration: 5ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.4×10-2Bq/cm3)
Cesium 134: Below the detection limit (Detection limit: 4.8×10-2Bq/cm3)
Cesium 137: Below the detection limit (Detection limit: 7.1×10-2Bq/cm3)
All β: Below the detection limit (Detection limit: 3.1×10-2Bq/cm3)
- Drain hole (southwest) of the underground reservoir No.7
Sampling performed at 6:25 AM on April 22
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: 5.7×10-2Bq/cm3)
Cesium 137: Below the detection limit (Detection limit: 6.6×10-2Bq/cm3)
All β: Below the detection limit (3.1×10-2Bq/cm3)
- Leakage detection hole (northeast) of the underground reservoir No.1
Sampling performed at 8:30 AM on April 22
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: 1.3×10-1Bq/cm3)
Antimony 125: 2.8×101Bq/cm3
Ruthenium 106: 2.3×100Bq/cm3
All β: 3.4×104Bq/cm3
- Leakage detection hole (southwest) of the underground reservoir No.1
Sampling performed at 8:35 AM on April 22
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: 5.1×10-2Bq/cm3)
Cesium 137: Below the detection limit (Detection limit: 6.7×10-2Bq/cm3)
All β: 6.4×10-1Bq/cm3
- Leakage detection hole (northeast) of the underground reservoir No.2
Sampling performed at 8:50 AM on April 22
Chloride concentration: 24ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 4.3×10-2Bq/cm3)
Cesium 134: Below the detection limit (Detection limit: 5.8×10-2Bq/cm3)
Cesium 137: Below the detection limit (Detection limit: 7.3×10-2Bq/cm3)
All β: 7.1×102Bq/cm3
- Leakage detection hole (southwest) of the underground reservoir No.2
Sampling performed at 8:45 AM on April 22
Chloride concentration: 10ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.3×10-2Bq/cm3)
Cesium 134: Below the detection limit (Detection limit: 5.5×10-2Bq/cm3)
Cesium 137: Below the detection limit (Detection limit: 6.6×10-2Bq/cm3)
All β: 7.5×10-1Bq/cm3
- Leakage detection hole (northeast) of the underground reservoir No.3
Sampling performed at 9:05 AM on April 22
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: 5.1×10-2Bq/cm3)
Cesium 137: Below the detection limit (Detection limit: 6.7×10-2Bq/cm3)
All β: 4.2×10-1Bq/cm3
- Leakage detection hole (southwest) of the underground reservoir No.3
Sampling performed at 9:00 AM on April 22
Chloride concentration: 21ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.7×10-2Bq/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: 1.1×102Bq/cm3
- Leakage detection hole (northeast) of the underground reservoir No.4
Sampling performed at 9:20 AM on April 22
Chloride concentration: 9ppm (Previously announced)
Iodine 131: Below the detection limit (Detection limit: 2.9×10-2Bq/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: 1.3×10-1Bq/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 9:30 AM on April 22
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: 4.9×10-2Bq/cm3)
Cesium 137: Below the detection limit (Detection limit: 6.8×10-2Bq/cm3)
All β: 1.8×10-1Bq/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) A3
Sampling performed at 11:29 AM on April 22
Chloride concentration: 5ppm
All β: Below the detection limit (Detection limit: 2.6×10-2Bq/cm3)
- Observation hole (near the underground reservoirs No.1-3) A4
Sampling performed at 11:46 AM on April 22
Chloride concentration: 7ppm
All β: Below the detection limit (Detection limit: 2.6×10-2Bq/cm3)
- Observation hole (near the underground reservoirs No.1-3) A8
Sampling performed at 10:45 AM on April 22
Chloride concentration: 9ppm
All β: Below the detection limit (Detection limit: 2.6×10-2Bq/cm3)
- Observation hole (near the underground reservoirs No.1-3) A9
Sampling performed at 10:10 AM on April 22
Chloride concentration: 9ppm
All β: Below the detection limit (Detection limit: 2.6×10-2Bq/cm3)
- Observation hole (near the underground reservoirs No.1-3) A10
Sampling performed at 9:49 AM on April 22
Chloride concentration: 10ppm
All β: Below the detection limit (Detection limit: 2.6×10-2Bq/cm3)
- Observation hole (near the underground reservoirs No.1-3) A11
Sampling performed at 10:35 AM on April 22
Chloride concentration: 33ppm
All β: Below the detection limit (Detection limit: 2.6×10-2Bq/cm3)
- Observation hole (near the underground reservoirs No.1-3) A12
Sampling performed at 10:03 AM on April 22
Chloride concentration: 8ppm
All β: Below the detection limit (Detection limit: 2.6×10-2Bq/cm3)
- Observation hole (near the underground reservoirs No.1-3) A14
Sampling performed at 9:42 AM on April 22
Chloride concentration: 8ppm
All β: Below the detection limit (Detection limit: 2.6×10-2Bq/cm3)
- Observation hole (near the underground reservoirs No.1-3) A15
Sampling performed at 9:55 AM on April 22
Chloride concentration: 8ppm
All β: Below the detection limit (Detection limit: 2.6×10-2Bq/cm3)
- Observation hole (near the underground reservoirs No.1-3) A18
Sampling performed at 10:55 AM on April 22
Chloride concentration: 10ppm
All β: Below the detection limit (Detection limit: 2.8×10-2Bq/cm3)
- Observation hole (near the underground reservoirs No.1-3) A19
Sampling performed at 10:11 AM on April 22
Chloride concentration: 9ppm
All β: Below the detection limit (Detection limit: 2.8×10-2Bq/cm3)
The observation holes (near the underground reservoirs No.1-3) A1, A2, A5, A6, A7, A13, A16 and A17 are currently being drilled.
- Observation hole (near the underground reservoirs No.6) B1
Sampling performed at 11:35 AM on April 22
Chloride concentration: 10ppm
All β: Below the detection limit (Detection limit: 2.8×10-2Bq/cm3)
- Observation hole (near the underground reservoirs No.6) B2
Sampling performed at 11:05 AM on April 22
Chloride concentration: 4ppm
All β: Below the detection limit (Detection limit: 2.8×10-2Bq/cm3)
- Observation hole (near the underground reservoirs No.6) B3
Sampling performed at 10:30 AM on April 22
Chloride concentration: 6ppm
All β: Below the detection limit (Detection limit: 2.8×10-2Bq/cm3)
- Groundwater bypass investigation hole (a)
Sampling performed at 10:57 AM on April 22
Chloride concentration: 17ppm
Tritium: Under analysis
All β: Below the detection limit (Detection limit: 2.8×10-2Bq/cm3)
- Groundwater bypass investigation hole (b)
Sampling performed at 11:36 AM on April 22
Chloride concentration: 9ppm
Tritium: Under analysis
All β: Below the detection limit (Detection limit: 2.8×10-2Bq/cm3)
- Groundwater bypass investigation hole (c)
Sampling performed at 12:51 PM on April 22
Chloride concentration: 11ppm
Tritium: Under analysis
All β: Below the detection limit (Detection limit: 2.8×10-2Bq/cm3)
- Groundwater bypass pump well (1)
Sampling performed at 11:50 AM on April 22
Chloride concentration: 46ppm
Tritium: Under analysis
All β: Below the detection limit (Detection limit: 2.6×10-2Bq/cm3)
- Groundwater bypass pump well (2)
Sampling performed at 11:55 AM on April 22
Chloride concentration: 43ppm
Tritium: Under analysis
All β: Below the detection limit (Detection limit: 2.6×10-2Bq/cm3)
- Groundwater bypass pump well (3)
Sampling performed at 12:06 PM on April 22
Chloride concentration: 99ppm
Tritium: Under analysis
All β: Below the detection limit (Detection limit: 2.6×10-2Bq/cm3)
- Groundwater bypass pump well (4)
Sampling performed at 12:05 PM on April 22
Chloride concentration: 18ppm
Tritium: Under analysis
All β: Below the detection limit (Detection limit: 2.6×10-2Bq/cm3)
- Groundwater bypass pump well (4)
Sampling performed at 12:05 PM on April 22
Chloride concentration: 18ppm
Tritium: Under analysis
All β: Below the detection limit (Detection limit: 2.6×10-2Bq/cm3)
- Sea side observation hole (A)
Sampling performed at 10:26 AM on April 22
Chloride concentration: 8ppm
Tritium: Under analysis
All β: Below the detection limit (Detection limit: 2.8×10-2Bq/cm3)
- Sea side observation hole (B)
Sampling performed at 1:13 PM on April 22
Chloride concentration: 8ppm
Tritium: Under analysis
All β: Below the detection limit (Detection limit: 2.8×10-2Bq/cm3)
The sea side observation holes (C),(D),(E),(F),(G) and (H) are currently being drilled.
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