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 January 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 permanent installation of equipment/facilities necessary to maintain cold shutdown has been completed on January 30, 2013. Internal voluntary inspection to confirm the soundness of the permanently installed equipment/facilities is to be performed. The restoration work for Units 1 is proceeding steadily.

- % in the chart shows the progress rate of restoration work as per the Restoration Plan (Up to the permanent installation) as of the end of January 2013. % in parenthesis shows the progress rate of the previous monthly report. See Appendix 1 for details.
- At the internal inspection after the permanent installation, the equipments subject to the Restoration Plan will be tested (for each unit).

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

Permanent installation of a power panel (P/C 1C-2) in Unit 1 Seawater Heat Exchanger Building
The power panel (P/C 1C-2) damaged by the Tsunami in Unit 1 Seawater Heat Exchanger Building was replaced with a newly manufactured power panel and has been permanently installed on January 28 after function check was completed. An internal voluntary inspection is to be performed.

Permanent installation of auxiliary facilities of the emergency diesel generator (A system) in Unit 1 Reactor Building Annex
The auxiliary facilities of the emergency diesel generator (A system) damaged by the Tsunami in Unit 1 Reactor Building Annex have been permanently installed on January 31 after function check was completed. An internal voluntary inspection is to be performed.

Completion of function check of the electric motor of the residual heat removal system cooling seawater system (C system) in Unit 1 Seawater Heat Exchanger Building
Trial operation of the electric motor of the residual heat removal system cooling seawater system (C system) damaged by the Tsunami in Unit 1 Seawater Heat Exchanger Building was performed on January 18 using temporary power supply and cable, and the electric motor was confirmed to operate properly as a result. The electric motor is to be permanently installed.

Permanent installation of the electric motors of the residual heat removal system cooling systems (B & D) in Unit 2 Seawater Heat Exchanger Building
Since Unit 2 power panel (P/C 2D-2) was permanently installed, the power supply to the electric motors of the residual heat removal system cooling systems (B & D) was switched from temporary power supply to the permanent power panel on January 28. As a result of trial operation performed after switching the power supply, the electric motors were confirmed to operate properly. The permanent installation of the electric motors of Unit 2 residual heat removal system cooling systems (B & D) has thus 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 (B & D) in Unit 2 Seawater Heat Exchanger Building
Since Unit 2 power panel (P/C 2D-2) was permanently installed, the electric motors of the residual heat removal system cooling seawater system (B) was connected with the permanent cable. As a result of trial operation, the electric motor was confirmed to operate properly. As for the electric motor of the residual heat removal system cooling seawater system (D), the power supply was switched from temporary power supply to the permanent power panel. After switching the power supply, trial operation was performed and the electric motor was confirmed to operate properly. The permanent installation of the electric motors of Unit 2 residual heat removal system cooling seawater systems (B & D) has thus been completed. An internal voluntary inspection is to be performed.

Permanent installation of the electric motor of the emergency diesel generator cooling system (B) in Unit 2 Seawater Heat Exchanger Building
Since Unit 2 power panel (P/C 2D-2) was permanently installed, the power supply to the electric motor of the emergency diesel generator cooling system (B) was switched from temporary power supply to the permanent power panel on January 29. As a result of trial operation performed after the power supply was switched, the electric motor was confirmed to operate properly. The permanent installation of the electric motor of Unit 2 emergency diesel generator cooling system (B) has thus been completed. An internal voluntary inspection is to be performed.

Permanent installation of the electric motor of the reactor component cooling system (B) in Unit 2 Seawater Heat Exchanger Building
Since Unit 2 power panel (P/C 2D-2) was permanently installed, the power supply to the electric motor of Unit 2 reactor component cooling system (B) was switched from temporary power supply to the permanent power panel on January 29. As a result of trial operation performed after the power supply was switched, the electric motor was confirmed to operate properly. The permanent installation of the electric motor of Unit 2 reactor component cooling system (B) has thus been completed. An internal voluntary inspection is to be performed.

Permanent installation of the purge line of the reactor coolant purification systems (A & B) in Unit 2 Reactor Building
As for the purge line of Unit 2 reactor coolant purification systems (A & B), the temporary hose was replaced with the permanent pipe. Since no problem was found with its operation as a result of water passing test, the permanent installation of the purge line has been completed. An internal voluntary inspection is to be performed.

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.

* 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 January 2013) (PDF 92.8KB)
2: < Photos > Major Progress Statuses Based on the Restoration Plan (January 2013) (PDF 229KB)
- Permanent installation of a power panel (P/C 1C-2) in Unit 1 Seawater Heat Exchanger Building
- Permanent installation of auxiliary facilities of the emergency diesel generator (A system) in Unit 1 Reactor Building Annex
- Completion of function check of the electric motor of the residual heat removal system cooling seawater system (C system) in Unit 1 Seawater Heat Exchanger Building
- Permanent installation of the electric motors of the residual heat removal system cooling systems (B & D) in Unit 2 Seawater Heat Exchanger Building
- Permanent installation of the electric motors of the residual heat removal system cooling seawater systems (B & D) in Unit 2 Seawater Heat Exchanger Building
- Permanent installation of the electric motor of the emergency diesel generator cooling system (B) in Unit 2 Seawater Heat Exchanger Building
- Permanent installation of the electric motor of the reactor component cooling system (B) in Unit 2 Seawater Heat Exchanger Building
- Permanent installation of the purge line of the reactor coolant purification systems (A & B) in Unit 2 Reactor Building