Current Status of Fukushima Daiichi Nuclear Power Station & Lessons Learned from Experiences of the Great East Japan

These materials may contain sensitive information from TEPCO or other companies. Therefore, the usage of these materials outside of their intended goal is prohibited, alongside the showing or publication of these materials to third parties. TEPCO Current Status of Fukushima Daiichi Nuclear Power Station & Lessons Learned from Experiences of the Great East Japan Earthquake at Fukushima Daini Nuclear Power Station July 18, 2016 @ Ottawa, Canada Naohiro Masuda Managing Executive Officer Fukushima Daiichi D&D Engineering Company President Chief Decommissioning Officer Tokyo Electric Power Company Holdings, Inc. (Former Site Superintendent of Fukushima Daini Nuclear Power Station) Tokyo Electric Power Company Holdings, Inc. All Rights Reserved.

Name: Naohiro MASUDA Introduction Education: B.S. in Electrical Engineering, Yokohama National University, 1980 Master s Degree in Electrical Engineering, Yokohama National University, 1982 Experience: Started the career as an electrical and I&C engineer Fukushima at the Fukushima Daini NPS Daini NPS (2F) in 1982 and was in charge of Unit 2-4 construction works Manager of Electrical and I&C design group, Headquarters in 2000 Plant manager at 2F site, 2005 through 2008 Site superintendent at 2F site, 2010 through 2013, and achieved the successful recovery of all the 4 units responding to the earthquake and tsunami on March 11, 2011 President of Fukushima Daiichi Decontamination and Decommissioning Engineering Company (FDEC), and Chief Decommissioning Officer since April 2014 Tokyo Electric Power Company Holdings, Inc. All Rights Reserved. 1

Sea Area Monitoring Concentration of Radioactive Materials has been Gradually Decreasing About one-millionth compared with the one after the accident Outside port are substantially below regulation limit Bq/l Front of Shallow Draft Quay Completion of Seaside Impermeable Wall Closure(Oct 26,2015) Regulation Limit Cesium 137: 90Bq/L Cesium 134: 60Bq/L Bq/l Completion of Seaside Impermeable Wall Closure(Oct 26,2015) North of Units 5&6 Discharge Outlet In Front of Unit 1-4 water-intake Sea-Side Impermeable Wall Near South Discharge Outlet Tokyo Electric Power Company Holdings, Inc. All Rights Reserved. 5

Worker Security and Improved Work Environment Efforts being made to secure personnel over long term while managing amount of worker radiation exposure. Further efforts made for continuous improvement of work environment while understanding worker needs. Changes in number of workers Improving work environment Large rest house Number of workers per weekday (TEPCO employees and contractors) engaged in work during March assumed as approximately 6,390 people. Percentage of locally born workers approximately 50% in Jan. Large rest house with a capacity of approx. 1,200 workers (from May 2015) Convenience store Lawson opened on March 1, 2016 New office building close to the field (from 2014) Change in the average number of workers (actual value) per weekday in the months following 2013. Ensuring stable long-term employment Currently, more than 90% of orders fulfilled by negotiated contracts, which enables contractors to secure workers in a long term. Fukushima Revitalization Meal Service Center (from March 2015) Providing warm meals to Fukushima Daiichi Creation of employment opportunities Dispelling harmful rumors about Fukushima food Trend of monthly exposure dose rate Tokyo Electric Power Company Holdings, Inc. All Rights Reserved. 6

Fuel Removal from the Spent Fuel Pool (Unit 4) Fuel removal started on November 18, 2013 Removal of 1535 fuel bundles completed on December 22, 2014 as scheduled No risk from fuel remains at unit 4. This gives confidence to proceed to fuel removal at units 1, 2 and 3 September 22, 2011 July 5, 2012 November 12, 2013: Completion of building steel framework (The volume of steel used is equivalent to those of Tokyo Tower.) Process of removing fuel rods at SFP Unit 4 Tokyo Electric Power Company Holdings, Inc. All Rights Reserved. 7

Response after the tsunami -- Recovery Actions toward Cold Shutdown -- 1. Plant status Plants shutdown safely Loss of cooling function: pumps and motors on the sea side Possible failure of confining function (PCV) 2. Strategy Restoration of cooling function 3. Actions Check equipment operability Prioritize restoration targets Replace motors, laying cables 4. Cooling function restored 5. Cold shut down and keep that status Walkdown on the sea side Tokyo Electric Power Company Holdings, Inc. All Rights Reserved. 9

Robustness For Further Enhancement of Safety Improve robustness to decrease risks against external events Resilience Improve capability of flexible and efficient response Even if we have a flat tire, spare tires and tools are available, and the personnel have the skills to use them in order to replace the flat tire themselves. Safety Goals to minimize social impact Filter vent to minimize contamination Tokyo Electric Power Company Holdings, Inc. All Rights Reserved. 10

Recovery Actions toward Cold Shutdown Walkdown to identify damage of equipment (Midnight, March 11) Under continuous tsunami alerts, walkdown must be done in the field where a lot of debris, openings and flooding areas existed in the dark. Emergency procurement of materials and equipment (March 12) Emergency procurement of motors, cable, mobile power vehicles, fuel oil and mobile transformers with close cooperation between site ERC and corporate ERC. Equipment and power restoration work in the field (March 13) Motors were replaced. Temporary cables were laid to supply power from undamaged power cubicles. Temporary cables of 9 km length were laid by about 200 employees within a day. Usually this size of cable laying requires 20 employees and more than 1 month period. Procurement of Power Supply Vehicles Replacement of a motor Reactor cooling started with restored RHR pumps (March 14) Various efforts enabled us to achieve cold shutdown at all units at 7:15 on March 15 th, 2011. Temp. Cable Laying Tokyo Electric Power Company Holdings, Inc. All Rights Reserved. 11

Countermeasures reflecting the lessons learned from our restoration activities after the tsunami and the accident in Fukushima Daiichi Lessons learned from Fukushima Daini Loss of Power Supply and Cooling Function Staging spare motors, cables etc. Deployment of power vehicles and GTG vehicles Increase of operational speed with improved skills Debris on the road Enhancing emergency response capability Making routes for emergency response by operating heavy machines by ourselves Lessons learned from Fukushima Daiichi Station Black Out Deployment of power vehicles and GTG vehicles Training site personnel for restoring power Loss of cooling and water injecting functions Stand by fire engines as water injection Training site personnel for water injection Tokyo Electric Power Company Holdings, Inc. All Rights Reserved. 12