Press Releases 2013

Based on the Restoration Plan (submitted on January 31, 2012, revised on May 31, October 16 and November 21, 2012) prepared in accordance with the Nuclear Operator Emergency Action Plan, Fukushima Daini Nuclear Power Station is now proceeding with restoration of facilities for maintaining cold shutdown of the station. We report the restoration progress status at the end of February 2013 as shown below.

1. Progress Status of the Restoration Plan
At Units 3 and 4, the restoration of equipment/facilities necessary to maintain cold shutdown has been completed.
At Unit 2, the restoration of equipment/facilities necessary to maintain cold shutdown and the internal voluntary inspection have been completed on February 15, 2013. On February 20, a restoration progress report based on the restoration plan has been submitted to the government. (Previously announced on February 20, 2013)
At Unit 1, the restoration of equipment/facilities necessary to maintain cold shutdown is ongoing (planned to be completed at the end of March 2013). Regarding the liner coming off^*1 of the piping of Unit 1 residual heat removal system cooling seawater system (B), the piping repair is estimated to require about 2 months^*2. Due to this, the (planned) restoration completion of Unit 1 is considered to be in the first half of FY 2013.
*1 The non-conformance has been discussed at the Non-conformances Management Committee meeting held on February 28, 2013 and announced on our web page.
*2 Announced in "Report on the plant status of Fukushima Daini Nuclear Power Station (Daily report: March 6, 2013)".

2. Major Progresses Based on the Restoration Plan (February 2013) [See Appendixes 1 and 2]

Permanent installation of the emergency diesel generator facilities (A) in Unit 1 Reactor Building Annex
The emergency diesel generator (A) facilities damaged by the Tsunami in Unit 1 Reactor Building Annex was permanently installed on February 13 after function check was completed. An internal voluntary inspection is to be performed.

Carry-in and installation of the auxiliary facilities of the emergency diesel generator (H) in Unit 1 Reactor Building Annex
The auxiliary facilities of the emergency diesel generator (H) damaged by the Tsunami in Unit 1 Reactor Building Annex were carried into the building and installed on February 23. Function check is to be performed.

Permanent installation of the electric motors of the residual heat removal system cooling systems (A and C) in Unit 1 Seawater Heat Exchanger Building
Since Unit 1 power panel (P/C 1C-2) damaged by the Tsunami was permanently installed, the power supply to the electric motors of the residual heat removal system cooling systems (A and C) was switched from temporary power supply to the permanent power panel on February 12. As the electric motors were confirmed to operate properly after switching the power supply, the permanent installation has been completed. An internal voluntary inspection is to be performed.

Permanent installation of the electric motors of the residual heat removal system cooling seawater systems (A and C) in Unit 1 Seawater Heat Exchanger Building
Since Unit 1 power panel (P/C 1C-2) damaged by the Tsunami was permanently installed, the power supply to the electric motors of the residual heat removal system cooling seawater systems (A and C) was switched from temporary power supply to the permanent power panel on February 8. As the electric motors were confirmed to operate properly after switching the power supply, the permanent installation has been completed. An internal voluntary inspection is to be performed.

Permanent installation of the electric motor of the emergency diesel generator cooling system (A) in Unit 1 Seawater Heat Exchanger Building
Since Unit 1 power panel (P/C 1C-2) damaged by the Tsunami was permanently installed, the power supply to the electric motor of the emergency diesel generator cooling system (A) was switched from temporary power supply to the permanent power panel on February 5. As the electric motor was confirmed to operate properly after switching the power supply, the permanent installation has been completed. An internal voluntary inspection is to be performed.

Permanent installation of the electric motor of the make-up water condensate system (A) in Unit 1 Turbine Building
Since Unit 1 power panel (P/C 1C-1) damaged by the Tsunami was permanently installed, the power supply to the electric motor of the make-up water condensate system (A) was switched from temporary power supply to the permanent power panel on February 7. As the electric motor was confirmed to operate properly after switching the power supply, the permanent installation has been completed. An internal voluntary inspection is to be performed.

Permanent installation of the electric motor of the low pressure reactor core spray system in Unit 1 Reactor Building
After Unit 1 power panel (M/C 1C) damaged by the Tsunami was permanently installed, power supply was provided to the electric motor of Unit 1 low pressure reactor core spray system. As the electric motor was confirmed to operate properly as a result of trial operation, the permanent installation has been completed on February 23. An internal voluntary inspection is to be performed.

Permanent installation of Unit 1-2 discharge channel monitor (common facility)
Unit 1-2 discharge channel monitor damaged by the Tsunami was replaced with a newly manufactured one. As the monitor was confirmed to operate properly as a result of function check, the permanent installation has been completed on February 18. (Previously announced on February 20, 2013)

In accordance with the four points to consider^* specified by the Nuclear Safety Commission when the cancellation of a nuclear emergency situation was declared, TEPCO is committed to continuously pursuing the measures for restoration from nuclear emergency and further reliability improvement. As for the consideration point 4, the systems subject to the measures were selected at the end of March 2012. We are currently in the process of assessing impact on the selected systems.

End

* Four points to consider specified by Nuclear Safety Commission
On December 26, 2011, the Nuclear Safety Commission submitted an opinion to the Prime Minster that the cancellation of a nuclear emergency situation of the TEPCO Fukushima Daini Nuclear Power Station is allowed to be declared, along with four points to consider for the issuance of the declaration. On January 11, 2012, the Nuclear and Industrial Safety Agency at the Ministry of Economy, Trade and Industry issued instructions to observe the consideration points when preparing and implementing the Restoration Plan for Fukushima Daini Nuclear Power Station.

1. Part of the facilities at the Fukushima Daini Nuclear Power Station is temporary installation, to which appropriate maintenance should be provided. The dependence rate of the temporary installation should be reduced according to a plan.
2. The safety facilities for part of the residual heat removal systems have not yet been recovered, to which appropriate management should be provided according to the situation until the restoration of these facilities. In preparing for natural disasters and other incidents, all possible measures should be taken to ensure safety.
3. Thorough safety management including the safety of workers should be implemented.
4. Based on the past pressure and temperature records before cold shutdown that showed abnormal values different from those during a regular period, impacts of these elements on the facilities should be considered.

Appendixes
1. Fukushima Daini Nuclear Power Station: Progress Status Based on the Restoration Plan (As of the End of February 2013) (PDF 85.3KB)
2. < Photos > Major Progress Statuses Based on the Restoration Plan (February 2013) (PDF 228KB)
- Permanent installation of the emergency diesel generator facilities (A) in Unit 1 Reactor Building Annex
- Carry-in and installation of the auxiliary facilities of the emergency diesel generator (H) in Unit 1 Reactor Building Annex
- Permanent installation of the electric motors of the residual heat removal system cooling systems (A and C) in Unit 1 Seawater Heat Exchanger Building
- Permanent installation of the electric motors of the residual heat removal system cooling seawater systems (A and C) in Unit 1 Seawater Heat Exchanger Building
- Permanent installation of the electric motor of the emergency diesel generator cooling system (A) in Unit 1 Seawater Heat Exchanger Building
- Permanent installation of the electric motor of the make-up water condensate system (A) in Unit 1 Turbine Building
- Permanent installation of the electric motor of the low pressure reactor core spray system in Unit 1 Reactor Building
- Permanent installation of Unit 1-2 discharge channel monitor (common facility)
3. Nuclear Disaster Training (PDF 98.2KB)
- Overview of the nuclear disaster training (emergency training) at Fukushima Daini Nuclear Power Station