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 major facilities.

* The updates are underlined.

[Nuclear Power Station]
·Fukushima Daiichi Nuclear Power Station: Unit 1 to 3: shut down due to the earthquake:
(Units 4 to 6: outage due to regular inspections before the earthquake)

- At around 8:30 on March 26, 2012, in the area of condensed water tanks for water desalinations (reverse osmosis membrane) of Fukushima Daiichi Nuclear Power Station, a partner company worker found that water was leaked from a pipeline (anti-pressure hose) which transferred the condensed water from the water desalinations to the condensed water tanks. In order to stop the water leakage, we stopped the transfer pumps of the water desalinations (reverse osmosis membrane) and then the leakage stopped. After that, we closed the valves at the both sides to the leakage point of the pipeline (anti-pressure hose). When we checked the leakage on the site later, we found that a part of the leaked water had been poured into a nearby drainage for general draining water. And then, we conducted sampling surveys on the leaked water, the water which was poured into the drainage, and the seawater around the exit of the drainage. As a result, we judged that some water including radioactive materials was poured into the sea from the exit of the drainage located at about 300 m south from the discharge channel of Unit 1-4 of Fukushima Daiichi Nuclear Power Station. At this moment, the water desalinations (reverse osmosis membrane and evaporative concentration apparatus) are not in service. However, because we have much treated fresh water, it does not affect water injection to the reactors. Total amount of leaked water is estimated to be approx 120 m³ in accordance with the operation hour of the pump. 80 L out of 120 m³ is estimated to flow into the sea at maximum. Thereafter, the cesium adsorption apparatus was stopped at 5:00 pm and the second cesium adsorption apparatus was stopped at 5:29 pm. At 9:10 am on March 28, we restarted the second cesium adsorption apparatus after having completed the work against the leakage. It reached the rated flow (approx. 40 m³/h) at 9:20 am. At 12:07 pm and 12:13 pm on the same day, we restarted the two lines of desalination facility (reverse osmosis membrane). As for the cesium adsorption apparatus, power retrofitting work had been conducted in order to establish 2 lines of power sources for accumulated water treatment facility. Thus, after having completed the work, at 2:32 pm on the same day, we restarted the Cesium Adsorption Apparatus and it reached the rated flow (approx. 19.1 m³/h)

- From 9:40 am to 12:30 pm on March 26, the water level and water temperature inside the PCV of Unit 2 was investigated with the industrial endoscope. As a result, the water level was confirmed to be 60 cm from the bottom of the PCV and the water temperature was confirmed to be in the range of approx. 48.5 °C to 50.0 °C. From 9:30 am to 10:30 am on March 27, we measured ambient dose rates of inside of PCV by inserting a dose rate meter around the upper part of grating through one of the penetration points of PCV (X-53 Pene). We confirmed that an ambient dose rate was 31.1 to 48.0 Sv/h at the point of approx. 50 cm inside from the edge of the penetration point (PCV side) towards the center. Another was 39.0 to 72.9 Sv/h at the point of approx. 1m inside from the edge towards the center.

- At 10:00 am on March 27, we started transferring of accumulated water from the basement of Unit 6 T/B to the temporary tank. At 4:00 pm on the same day, the transfer was stopped. At 10:00 am on March 28, the transfer was restarted.

- At 2:00 pm on March 27, Hydrazine injection into the Unit 4 reactor well through the instrument pipes inside the reactor was started. The injection of hydrazine completed at 4:40 pm on the same day.

- At 7:05 am on March 28, 2012, we stopped Shutdown Cooling System due to suspension of power supply for construction work regarding power supply cars installation in case of outage of AC power source of Unit 5 and 6. Due to this work, cooling the reactor stopped (water temperature of the reactor when stopped: approx. 32.3°C). At 2:56 pm on the same day, we restarted Shutdown Cooling System and re-started cooling the reactor. (water temperature of the reactor when restarted: approx. 38.2°C)

·Fukushima Daini Nuclear Power Station:
Units 1 to 4: shutdown due to the earthquake

- At 12:42 pm on March 27, in the Unit 3 and 4 Service Buildings when a TEPCO member was bringing in analysis samples from Fukushima Daiichi Nuclear Power Plant, he confirmed that there was contamination by radioactive materials on a desk beside a small object monitor (non-controlled area*) at the checkpoint for the confirmation of contamination of goods for workers exiting from controlled area. Currently we are investigating the cause of the contamination. The contaminated desk and other spots where there is a possibility of contamination are partitioned and under control now. The investigation revealed that the radioactive materials on the desk beside a small object monitor at the checkpoint of service building of Unit 4 had been leaked from (water) samples. The leaked amount was approx. 2.5 cc. The surface radioactive density is approx. 206 Bq/cm² which was measured by radioactive survey meter. We measured the sample convey paths within the service building and found 7 contaminated spots (max. over 700 Bq/cm²) in the non-controlled area. We removed the contamination of 4 spots and set temporary controlled area for the other 3 spots. In addition, we found contamination in a car of Fukushima Daini Power Station which conveyed the samples. We judged that there were no contamination except the service building of Unit 3 and 4, since no contamination was found on the external surface of the car and near the entrance of the service building.

*Controlled area is the area which requires control for prevention of unnecessary exposure and prevention of increase of radioactive contamination. Non-controlled area is the area other than controlled area.

- Periodic inspection of the monitoring posts (7 in total: from No.1 to 7) located at the site boundary was started from March 27.
No. 1: From 10:11 am to 11:30 am on March 27
No. 2: From 2:21 pm to 3:40 pm on March 27
No. 3: From 10:01 am to 11:10 am on March 28
No. 4: From 1:31 pm to 2:40 pm on March 28

·Kashiwazaki Kariwa Nuclear Power Station:
Units 1 to 7: outage due to regular inspections

[Thermal Power Station]
·Power supply has returned to normal and the facilities damaged by the earthquake are now being handled in a timely manner.

[Hydro Power Station]
·Power supply has returned to normal and the facilities damaged by the earthquake are now being handled in a timely manner.

[Impacts on Transmission Facilities]
·Power supply has returned to normal and the facilities damaged by the earthquake are now being handled in a timely manner.

[Impacts on Power Supply and Demand Balance]
We expect to maintain stable power supply in March.
Daily supply and demand balance is announced at our "TEPCO Electricity Forecast".

Appendix: Past Progress (As of 3:00 pm, on March 28, 2012) (PDF 511KB)
Appendix: Past Progress (From March 11, 2011 to July 31, 2011) (PDF 225KB)
* Revised past progress