Status of TEPCO's Nuclear Power Stations after the Tohoku-Chihou-Taiheiyou-Oki Earthquake (Daily Report as of 3:00 PM on August 15)

Due to the Tohoku-Chihou-Taiheiyou-Oki Earthquake which occurred on March 11, 2011, TEPCO's facilities including our nuclear power stations have been severely damaged. We deeply apologize for the anxiety and inconvenience caused.
With regard to the accident at Fukushima Daiichi Nuclear Power Station, on April 17, 2011, we have compiled the roadmap towards restoration from the accident and on July 19 we accomplished the Step1 target "Radiation dose is in steady decline". Then on December 16 we confirmed the accomplishment of the Step 2 target "Release of radioactive materials is under control and radiation doses are being significantly held down".
In addition, on December 21, 2011, we have compiled the "Mid-to-long-Term Roadmap toward the Decommissioning of Fukushima Daiichi Nuclear Power Units 1-4, TEPCO".
In addition to the maintenance of the plant's stable condition, we will implement Mid-to-Long Term countermeasures towards the decommissioning of Fukushima Daiichi Nuclear Power Units 1-4 to enable evacuees to return to their homes as soon as possible and reduce the anxiety of the people in Fukushima and the whole nation as soon as possible.

Below is the status of TEPCO's Fukushima Daiichi Nuclear Power Station.

* The updates are underlined.

[Fukushima Daiichi Nuclear Power Station]
· Unit 1 to 4: Abolishment (April 19, 2012)
· Unit 5 to 6: Outage due to regular inspections before the earthquake

-Contaminated water transfer from the underground reservoirs was all completed as of July 1. However, we are continuing to take measures to prevent the expansion of contaminated water, and to conduct sampling activities.

<Measures to prevent the expansion of contaminated water>
· Since the decreases of all-β radioactivity densities in the leakage detection holes (at the northeast side of the underground reservoir No.1, the northeast side of the underground reservoir No.2, and the southwest side of the underground reservoir No.3) have been slow, operations to dilute the underground reservoirs No.1-No.3 by transferring filtered water or desalination-system (RO) treated water (the all-β radioactivity density: approx. 1×10¹Bq/cm³) into these reservoirs have been conducted as appropriate.
[Recent dilution operations]
Underground reservoir No.1 (since June 19): On August 3, approx. 60m³ of filtered water was injected.
Underground reservoir No.2 (since June 27): On August 1, approx. 60m³ of filtered water was injected.
Underground reservoir No.3 (since July 24): On August 11, approx. 51m³ of water in the drain hole (northeast) of this underground reservoir was injected.

· On August 14, leaked water in the leakage detection holes at the underground reservoirs No.1-No.3 was transferred to the temporary aboveground tank, and leaked water in the drain holes at the underground reservoirs No.1 and No.2 was transferred into these underground reservoirs.

<Sampling>
On August 14, sampling was performed in the drain holes of the underground reservoirs No.1-No.7 (14 locations), the leakage detection holes of the underground reservoirs No.1-No.4 and No.6 (sample could not be collected at 2 out of 10 locations) and the observation holes of the underground reservoirs (22 locations). As a result of the analysis, no significant change was found compared to the analysis results from the sampling performed previously (on August 13). Further, analysis for tritium was performed on water sampled on August 7 in the drain holes and the leakage detection holes of the underground reservoirs No.1-No.4 and No.6. As a result, no significant change was found compared to the previous analysis results (on July 31).

We installed observation holes east of the Unit 1-4 Turbine Buildings, and have been conducting sampling and analysis of groundwater from the observation holes. On June 19, we announced that tritium and strontium were detected at high densities in the observation hole located between Units 1 and 2. Therefore, we have been conducting intensified monitoring.

· At 2:10 PM on August 9, we started pumping up groundwater from the water collection pit (south) installed east of Units 1 and 2 Turbine Buildings and transferring the pumped-up groundwater to the Unit 2 vertical shaft C.

· At 11:35 AM on August 15, we started pumping up groundwater from one well point (pumping facility using a vacuum, scheduled to be installed at 28 locations) installed east of Units 1 and 2 Turbine Buildings and transferring the pumped-up groundwater to the Unit 2 vertical shaft C. No abnormality such as leakage, etc. has been found at transferring.

-Since high level of tritium was detected in water sampled at the groundwater observation hole No.0-1, analysis for all β and tritium was performed on water sampled on August 5 in Unit 1 sub-drain No.1. Further, analysis for γ nuclide, all β and tritium was performed on water sampled on August 5 in Unit 1 sub-drain No.2.

<Sub-drain No.1>
All-β 290Bq/L
Tritium 110,000Bq/L

<Sub-drain No.2>
Cesium-134 ND (detection limit value: 14Bq/L)
Cesium-137 20Bq/L
All-β 25Bq/L
Tritium 3,200Bq/L

-At around 3:10 PM on August 12, an associated company worker, who was taking a rest at a rest area of the registration center at Fukushima Daiichi NPS, complained of his bad condition (headache and nausea), and was treated with drip infusion, etc. at the emergency medical room in the Entrance Area management Building. However, since the worker showed no sign of recovery, a doctor decided that urgent transportation to a hospital was needed. At around 4:00 PM on the same day, an ambulance was called to transport the worker to a hospital. As a result of medical examination at the hospital, he was diagnosed with a mild symptom of dehydration, and was treated with drip infusion. However, the worker had not shown recovery, and was in hospital at present. Since the worker showed recovery, he left the hospital at around 11:00 AM on August 15. Initially, he was diagnosed with a mild symptom of dehydration, but the diagnosis changed to his chronic disease. Therefore, this incident does not related to any works.

* Revised past progress

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