Status of TEPCO's Nuclear Power Stations after the Tohoku-Chihou-Taiheiyou-Oki Earthquake (Daily Report as of 3:00 PM, March 22)

Status of TEPCO's Nuclear Power Stations after the Tohoku-Chihou-Taiheiyou-Oki Earthquake (Daily Report as of 3:00 PM, March 22)

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 nuclear power stations (Fukushima Daiichi and Fukushima Daini).

* 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

-On March 21, one out of the nine dry storage casks stored in the Cask Storage Building has been transported to the Common Pool Building.

-At 4:45 PM on March 21, Unit 1 reactor injection water amount was adjusted as follows since the amount had decreased. Feed water system: Increased from approx. 2.3m³/h to approx. 2.5m³/h, reactor core spray system: Maintained at approx. 2.0m³/h.

-At 4:45 PM on March 21, Unit 2 reactor injection water amount was adjusted as follows since the amount had decreased. Feed water system: Increased from approx. 1.8m³/h to approx. 2.0m³/h, reactor core spray system: Increased from approx. 3.3m³/h to approx. 3.5m3/h.

-At 4:45 PM on March 21, Unit 3 reactor injection water amount was adjusted as follows since the amount had decreased. Feed water system: Increased from approx. 1.8m³/h to approx. 2.0m³/h, reactor core spray system: Increased from approx. 3.3m³/h to approx. 3.5m3/h.

-At 9:43 AM on March 22, systems A and B of Unit 1 PCV gas control system were suspended^* in accordance with Article 136 Section 1 of the technical specification in order to relocate the power supply related facilities and modify the control system (transition out of the scope of the operational requirements for maintenance work).
*The facility management policy based on Chapter 12 of the technical specification for the nuclear reactor facility "Policy on the Mid-term Security" stipulates "operational requirements" and "necessary measures to be implemented in the case that the operational requirements are not fulfilled" (When the operational requirements are not fulfilled, the required measures must be implemented).

-At 10:27 AM on March 15, we started transferring the accumulated water in Unit 3 Turbine Building basement to the Central Radioactive Waste Treatment Facility (Process Main Building). At 10:34 AM on March 19, the transfer was stopped since the accumulated water level monitoring has been disabled after the power supply of the Main Anti-earthquake Building being momentarily stopped at around 6:57 PM on March 18. At 9:56 AM on March 20, the transfer has been restarted as the accumulated water level monitoring was recovered. At 10:12 AM on March 22, the transfer was stopped. At 2:16 PM on the same day, we started transferring the accumulated water in Unit 3 Turbine Building basement to the Central Radioactive Waste Treatment Facility (Miscellaneous Solid Waste Volume Reduction Treatment Building [High Temperature Incinerator Building]).

-At 2:48 PM on March 22, we started transferring the accumulated water in Unit 2 Turbine Building basement to Unit 3 Turbine Building basement.

-At 7:32 AM on March 15, the second cesium adsorption apparatus was suspended for reliability improvement work, etc. At 11:43 AM on the same day, the cesium adsorption apparatus was started accordingly. At 12:02 PM, the steady flow rate was achieved. At 9:28 AM on March 21, the cesium adsorption apparatus was stopped as the reliability improvement work for the second cesium adsorption apparatus had completed. At 12:06 PM on March 22, the second cesium adsorption apparatus was started. At 1:00 PM on the same day, the steady flow rate (approx. 35.5m3/h) has been achieved.

[Fukushima Daini Nuclear Power Station]
·Unit 1 to 4: Shutdown due to the earthquake.

*In the daily report previously announced, it said "at 9:43 AM on March 22, systems A and B of Unit 1 PCV gas control system were suspended in order to relocate the power supply related facilities and modify the control system", however, the statement has been corrected to "at 9:43 AM on March 22, systems A and B of Unit 1 PCV gas control system were suspended in accordance with Article 136 Section 1 of the technical specification in order to relocate the power supply related facilities and modify the control system (transition out of the scope of the operational requirements for maintenance work)". We apologize for the mistake. (Correction made on March 23, 2013)

* Revised past progress

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