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Japan’s Nuclear Accident - Update -

Japan’s Nuclear Accident - Update -. May 12, 2011 Ministry of Economy, Trade and Industry Government of Japan. Table of Contents. A. Japan Faces an Unprecedented Challenge (Enormous Earthquake, Tsunamis and Nuclear Accident). 1. Damage 2. Nuclear Power Stations. B . Key Challenges.

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Japan’s Nuclear Accident - Update -

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  1. Japan’s Nuclear Accident- Update - May 12, 2011 Ministry of Economy, Trade and Industry Government of Japan

  2. Table of Contents A. Japan Faces an Unprecedented Challenge (Enormous Earthquake, Tsunamis and Nuclear Accident) 1. Damage 2. Nuclear Power Stations B. Key Challenges 1. Cool Down the Reactors 2. Contain the Spread of Radioactive Substances (sea, soil and atmosphere) 3. Rigorous and Intensive Monitoring C. Impact on Energy Supply/Demand D. Responsiveness to the World 1. Impact on Energy Supply/Demand in Japan 1. Cooperation with International Organizations 2. Speedy Dissemination of Accurate Information

  3. Great Support of the International Community Japan deeply appreciatesthe assistance offered from 142 countries and regions and 39 international organizations Rescue teams from 24 countries regions and international organizations US Navy/US Pacific Command (Operation Tomodachi)

  4. A. Japan Faces an Unprecedented Challenge (Enormous Earthquake, Tsunamis and Nuclear Accident) Tsunamis 14 meters or higher Earthquakes: M - 9.0 quake (March 11) M - 7 class 5 times M - 6 class 63 times M - 5 class 335 times TOKYO■ Fukushima Dai-ichi

  5. 1. Damage Casualties : over 26,000 Evacuees : over 130,000 (As of April 25th) KYODO NEWS ： over 14,000 ： over 11,000 ・Dead ・Missing KYODO NEWS NOAA/US Dept of Commerce, http://wcatwc.arh.noaa.gov/

  6. 2. Nuclear Power Stations Nuclear Reactors near Epicenter of the Earthquake 4 Nuclear Power Stations with 14 Units Periodical inspection

  7. 2. Nuclear Power Stations Fukushima Dai-ichi Nuclear Power Station Before the Earthquake and Tsunamis After the Earthquake and Tsunamis Unit 6 Unit 5 Unit 1 Unit 2 Unit 3 Unit 4 TEPCO Air Photo Service Inc (Myoko, Niigata Japan)

  8. 2. Nuclear Power Stations Fukushima Dai-ichi Nuclear Power Station Cause of the Damage Huge Tsunami Grid Line 46 Meter 46 Meter ①Loss of off-site power due to the earthquake Reactor Building GE Hitachi Nuclear Energy About 40M About 20M Turbine Building Tsunami (estimated 14m) Breakwater Diesel Generator 5.4 ~5.7m ②Diesel generator inoperable due to the tsunami Elevation: about 10m Seawater level All motion operated pumps including ECCS became inoperable Seawater Pump

  9. B. Key Challenges Cool Down the Reactors Contain the Spread of Radioactive Substances (sea, soil and atmosphere) Rigorous and Intensive Monitoring

  10. 1. Cool Down the Reactors (As of April25th)

  11. Cool Down the Reactors • (Unit 1) （As of Apr 25th, 2011） Spray • Fuel Bundle • ・400 • Spent Fuel in the Pool • ・292 + 100 (new) Damaged Spent Fuel Pool Cooling System Injecting freshwater or seawater The fuel pellets are presumed to be melting • Major Events • ・Mar.12 - Venting started • ・Mar.12 - Hydrogen explosion • ・Mar.12 - Seawater injection to • reactor core • ・Mar.25 - Fresh water injection to • reactor core • ・Mar.31 - Fresh water spray by • concrete pump trucks • to spent fuel pool • ・Apr. 7 - Injection of nitrogen to • the primary containment • vessel TEPCO Damaged Recovered Emergency Diesel Generator External Power (Mar.24- connected to the central control room) Residual Heat Removal System 10

  12. Cool Down the Reactors • (Unit 2) （As of Apr 25th, 2011） • Fuel Bundle • ・548 • Spent Fuel in the Pool • ・587 + 28 (new) Damaged Spent Fuel Pool Cooling System Injecting freshwater or seawater The fuel pellets are presumed to be melting • Major Events • ・Mar.13 - Venting started • ・Mar.14 -Seawater injection to • reactor core • ・Mar.15 -Sound of explosion • ・Mar.20 - Seawater injection to spent • fuel pool (SFP) • ・Mar.26 - Fresh water injection to • reactor core • ・Mar.29 - Fresh water injection to • SFP Possible damage of the suppression chamber Ministry of Defense Damaged Recovered Emergency Diesel Generator External Power (Mar.26- connected to the central control room) Residual Heat Removal System

  13. Cool Down the Reactors • (Unit 3) （As of Apr 25th, 2011） 1. Cool Down the Reactors (Unit 3) (As of 18:30 April 8th, 2011) Spray • Fuel Bundle • ・548 • Spent Fuel in the Pool • ・514 + 52 (new) Damaged Spent Fuel Pool Cooling System Injecting freshwater or seawater The fuel pellets are presumed to be melting • Major Events • ・Mar.13 - Venting started • ・Mar.13 -Seawater injection to • reactor core • ・Mar.14 - Hydrogen explosion • ・Mar.20 - Sprayed to spent fuel • pool (SFP) by Tokyo • Fire Department • ・Mar.25 - Fresh water injection • to reactor core • ・Mar.27 - Fresh water spray by • concrete pump trucks • to SFP Air Photo Service Inc (Myoko, Niigata Japan) Damaged Recovered Emergency Diesel Generator External Power (Mar.22- connected to the central control room) Residual Heat Removal System

  14. Cool Down the Reactors • (Unit 4) （As of Apr 25th, 2011） • Cool Down the Reactors • (Unit 4) (As of 18:30 April 8th, 2011) Spray • Fuel Bundle • ・0 • Spent Fuel in the Pool • ・1331 + 204 (new) Damaged Spent Fuel Pool Cooling System No Fuel in Reactor Pressure Vessel • Major Events • ・Mar.15 - Fire occurred • ・Mar.16 - Fire occurred • ・Mar.20 - Seawater spray by • Self- Defense • Forces to spent • fuel pool (SFP) • ・Mar.25 - Seawater injection • to SFP • ・Apr. 7 - Fresh water spray • by concrete pump • trucks to SFP Recovered Air Photo Service Inc (Myoko, Niigata Japan) External Power (Mar.29- connected to the central control room)

  15. Cool Down the Reactors • (Unit 5&6) （As of Apr 25th, 2011） • Fuel Bundle • ・Unit5 : 548 • Spent Fuel in the Pool • ・Unit 5 : 946 + 48 (new) • Fuel Bundle • ・Unit6 : 764 • Spent Fuel in the Pool • ・Unit 6: 876 + 64 (new) Functioning Spent Fuel Pool Cooling System Spent Fuel Pool Cooling System KYODO NEWS Functioning Recovered External Power [Unit 5] Emergency Diesel Generator Emergency Diesel Generator External Power [Unit 6] (Mar.22- connected to the central control room) Residual Heat Removal System Residual Heat Removal System

  16. 2. Containthe Spread of Radioactive Substances(sea, soil and atmosphere) The Japanese Government and TEPCO are making the utmost efforts to prevent the dispersion of flow-out radioactive contaminated water. • Major Events • ・Mar. 27 • Stagnant water on the basement • floor of the turbine of Unit2 • and in the trenches found • to be highly contaminated • ・Mar. 29 • Water in the storage tank started to • be transferred to the surge tank, • which is the preparation for transfer • of stagnant water in the trenches. • ・Apr. 1 • Highly contaminated water • discovered leaking into the sea • ・Apr. 6 • Leak of contaminated water • into the sea was stopped • ・Apr. 19 • Transfer of stagnant water in the • trench of Unit 2 started

  17. 2. Containthe Spread of Radioactive Substances(sea, soil and atmosphere) Experts are making the utmost efforts to prevent dispersing radioactive substances contained in dust, debris and vapor. Spraying synthetic materials on the surface of the ground and debris to prevent radioactive substances dispersion TEPCO

  18. Roadmap towards Restoration from the Accident (announced by TEPCO on Apr.17) Around 3 months Apr.17 Mar.11 Around 6~9 months Step 1 Step 2 Radiation dose in steady decline Controlling release of radioactive materials(significant reduction of dose level) Target Stable cooling - Resume heat exchange function - [Unit 1,3] flood up to top of active fuel - [Unit 2] Seal the damaged location Achieve cold shutdown [Reactors] More stable cooling - Keep sufficient level of water by remote-control - Resume heat exchange function Stable cooling - Enhance reliability of water injection - Restore coolant circulation system - [Unit 4] Install supporting structure [Spent Fuel Pools] Secure storage place - Prevention of outflow to the outside of the site Decrease contaminated water(decontamination and desalt) [Contaminated Water] [Contaminated Atmosphere/Soil] Install reactor building cover Prevention of spread

  19. 3. Rigorous and Intensive Monitoring TEPCO monitors radioactivity levels every 10 minutes and releases the results immediately. Radioactivity levels rose on March 15th, but have since fallen and remain low. Environmental Radioactivity Level at the Fukushima Dai-ichi NPS Monitoring posts and the readings at the Fukushima Dai-ichi NPS (μSv/h) Measurement point: Main Gate (1.0km from Unit2) or West Gate (1.1km from Unit2) • Unit 1~6 （μSv/h） Explosion in Unit2 12,000 White smoke from Unit3 • Near West Gate • 21.0 μSv/h 4,000 2,000 Grayish smoke from Unit3 0 • Main Gate • 53.0 μSv/h （as of 10:00 April 25th, 2011） TEPCO

  20. Atmospheric Readings in Tokyo, Osaka and Sapporo μSv/hour μSv/hour 0.3 0.2 0.1 0.0 0.3 0.2 0.1 0.0 Tokyo 230km Sapporo 630km Green box indicates normal range of radioactivity μSv/hour 0.3 0.2 0.1 0.0 Osaka 400km Fukushima Dai-ichi MEXT

  21. INES Rating on the Events in Fukushima Dai-ichi NPS The Rating of the International Nuclear and Radiological Event Scale (INES) on Fukushima Dai-ichi Nuclear Power Station (NPS), in temporary assessed as Level 7. Chernobyl [5.2 millionTBq] Major Accident Serious Accident Accident with Wide Consequences Accident with Local Consequences Serious Incident Incident Anomaly No Safety Significance Fukushima Dai-ichi [0.37~0.63 millionTBq] 7 6 Three Miles Island 5 4 3 *Level 7 : more than several tens of thousands TBq131I *Level 6 : thousands to tens of thousands TBq131I *Level 5 : hundreds to thousands TBq131I 2 1 0

  22. C. Impact on Energy Supply/Demand • 1. Impact on Energy Supply/Demand

  23. 1. Impact on Energy Supply/Demand in Japan Tokyo Electric Power Company supplies electricity to an area with 42 million people and 40% of Japan’s GDP, but lost 40% of its generation capacity after the earthquake and tsunami. We are making the utmost efforts to match supply and demand during the peak-load summer on both the demand and supply side. 22

  24. D. Responsiveness to the World • Cooperation with International Organizations • Speedy Dissemination of Accurate Information

  25. 1. Cooperation with International Organizations Joint Statement from above Five Organizations http://www2.icao.int/en/NewsRoom/Lists/News/Attachments/37/PIO.05.11.EN.pdf

  26. 2. Speedy Dissemination of Accurate Information • Japan is committed to the speedy dissemination of accurate information. • All necessary information are available below.

  27. The people of Japan deeply appreciate the sympathy and assistance pouring in from people all over the world.

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