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 December 2012 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. The restoration work for Units 1 and 2 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 December 2012. % 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 (December 2012)

Permanent installation of a power panel (P/C 1D-2) in Unit 1 Seawater Heat Exchanger Building
The power panel (P/C 1D-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 December 27 after function check was completed. An internal voluntary inspection is to be performed. [See Appendix 1 and 2]

Carry-in and installation of the auxiliary facilities of emergency diesel generator (A system) in Unit 1 Reactor Building Annex
As for the emergency diesel generator (A) which was damaged by the Tsunami in Unit 1 Reactor Building Annex, the newly manufactured auxiliary facilities have been carried in and installed on December 12. A function check is to be performed. [See Appendix 1 and 2]

Carry-in and installation of the charger and battery for the DC power supply (H system) in Unit 1 Reactor Building Annex
As for the charger and battery for the DC power supply (H system) which were damaged by the Tsunami in Unit 1 Reactor Building Annex, the newly manufactured charger and battery have been carried in and installed on December 18. A function check is to be performed. [See Appendix 1 and 2]

Carry-in and installation of the electric motor of the high pressure reactor core spray system component cooling system in Unit 1 Seawater Heat Exchanger Building
The electric motor of the high pressure reactor core spray system component cooling system which was damaged by the Tsunami in Unit 1 Seawater Heat Exchanger Building was replaced with a newly manufactured one. The new electric motor has been carried in and installed on December 13. A function check is to be performed. [See Appendix 1 and 2]

Installation of the electric motor of the high pressure reactor core spray system component cooling seawater system in Unit 1 Seawater Heat Exchanger Building
The electric motor of the high pressure reactor core spray system component cooling seawater system which was damaged by the Tsunami in Unit 1 Seawater Heat Exchanger Building was replaced with a newly manufactured one which has been installed on December 26. A function check is to be performed. [See Appendix 1 and 2]

Permanent installation of the emergency gas treatment system (A system) in Unit 1 Reactor Building Annex
After the power panel (P/C 1C-1) in Unit 1 was permanently installed, power supply was provided to the electric motor of Unit 1 emergency gas treatment system (A system) on December 14. As the electric motor was confirmed to operate properly as a result of trial operation, Unit 1 emergency gas treatment system (A system) has been permanently installed and an internal voluntary inspection has also been completed. [See Appendix 1 and 2]

Permanent installation of a power panel (P/C 2D-2) in Unit 2 Seawater Heat Exchanger Building
The power panel (P/C 2D-2) which was damaged by the Tsunami in Unit 2 Seawater Heat Exchanger Building was replaced with a newly manufactured power panel. After functional check was completed, the new power panel has been permanently installed on December 25. An internal voluntary inspection is to be performed. [See Appendix 1 and 2]

Carry-in and installation of Units 1-2 discharge channel monitor (common facility)
Units 1-2 discharge channel monitor which was damaged by the Tsunami was replaced with a newly manufactured one. The new discharge channel monitor has been carried in and installed on December 10. A function check is to be performed. [See Appendix 1 and 2]

3. Completion of Inspection of the Structures inside Unit 4 Reactor

The seismic response analysis results based on the observation record of the Tohoku-Chihou-Taiheiyou-Oki Earthquake in 2011 indicate that the structures inside Units 1-4 RPV was evaluated to maintain sufficient safety functions. (Previously announced on August 18, 2011)
From November 27, 2012, the structures inside Unit 4 reactor (representative unit) for which opening of the reactor and fuel removal have been completed has been visually inspected for the purpose of obtaining more information on seismic impact. (Previously announced on November 26 and December 5, 2012)
From November 27 to December 12, 2012, the structures and equipment in the reactor were visually inspected utilizing an underwater camera. As a result, no abnormality which may affect the reactor's function was found. (Previously announced on December 13, 2012) [See Appendix 3]

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 December 2012) (PDF 65.9KB)
2: < Photos > Major Progress Statuses Based on the Restoration Plan (December 2012) (PDF 135KB)
- Permanent installation of a power panel (P/C 1D-2) in Unit 1 Seawater Heat Exchanger Building
- Carry-in and installation of the auxiliary facilities of emergency diesel generator (A system) in Unit 1 Reactor Building Annex
- Carry-in and installation of the charger and battery for the DC power supply (H system) in Unit 1 Reactor Building Annex
- Carry-in and installation of the electric motor of the high pressure reactor core spray system component cooling system in Unit 1 Seawater Heat Exchanger Building
- Installation of the electric motor of the high pressure reactor core spray system component cooling seawater system in Unit 1 Seawater Heat Exchanger Building
- Permanent installation of the emergency gas treatment system (A system) in Unit 1 Reactor Building Annex
- Permanent installation of a power panel (P/C 2D-2) in Unit 2 Seawater Heat Exchanger Building
- Carry-in and installation of Units 1-2 discharge channel monitor (common facility)
3: Completion of the Inspection of the Structures inside Unit 4 Reactor (PDF 104KB)