1. YALE/TULANE ESF-8 PLANNING AND RESPONSE PROGRAM SPECIAL REPORT (FUKUSHIMA DAIICHI NUCLEAR POWER PLANT) YALE/TULANE ESF-8 PLANNING AND RESPONSE PROGRAM SPECIAL REPORT (FUKUSHIMA DAIICHI NUCLEAR POWER PLANT) MAP HEALTH EFFECTS HEALTH EFFECTS HEALTH EFFECTS HEALTH EFFECTS NUCLEAR POWER PLANT NUCLEAR POWER PLANT NUCLEAR POWER PLANT NUCLEAR POWER PLANT RADIOACTIVITY IN FOOD RADIOACTIVITY IN FOOD RADIOACTIVITY IN FOOD RADIOACTIVITY IN FOOD RADIOACTIVITY IN WATER RADIOACTIVITY IN WATER RADIOACTIVITY IN WATER RADIOACTIVITY IN WATER RADIOACTIVITY IN SEA WATER RADIOACTIVITY IN SEA WATER RADIOACTIVITY IN SEA WATER RADIOACTIVITY IN SEA WATER RADIOACTIVITY IN SOIL AND AIR RADIOACTIVITY IN SOIL AND AIR RADIOACTIVITY IN SOIL AND AIR RADIOACTIVITY IN SOIL AND AIR BACKGROUND GAMMA READINGS GAMMA READINGS GAMMA READINGS GAMMA READINGS AS OF 0017 HRS EDT 21 APRIL 2011 GOVERNMENT OF JAPAN http://www.kantei.go.jp/foreign/index-e.html Ministry of Education, Culture, Sports, Science and TechnologyMinistry of Education, Culture, Sports, Science and Technology (MEXT) Nuclear and Industrial Safety Administration Nuclear and Industrial Safety Administration (NISA) INTERNATIONAL ORGANIZATIONS RELIEFWEB International Nuclear Safety Center International Atomic Energy Agency Global Disaster Alert and Coordination System WHO WHO – Health Action In Crisis WHO-WPRO US GOVERNMENT ORGANIZATIONS US Government - Japan Earthquake and Tsunami The Department of State U.S Embassy in Japan State Dept.'s DipNote on Twitter State Dept. Background Note U.S. Agency for International Development OFDA The Department of Health and Human Services Centers for Disease Control and Prevention CDC- Tsunami CDC-Earthquake CDC-Radiation Emergencies NIOSH FDA NIOSH EPA OSHA DOE - NNSA PORTALS AND RESOURCES All Partners Access Network (APAN) Japan Disaster Wiki CATDAT and Earthquake Reports GDACS Center of Excellence – Disaster Management Humanitarian Assistance National Center for Disaster Medicine and Public Health Google Crisis Resources Japan Atomic Industrial Forum LIBRARY National Medical Library – Japan Earthquake Disaster Information Management Research Center Radiation Emergency Medical Management AFTERSHOCKS KEY LINKS

2. FUKUSHIMA DAIICHI NUCLEAR POWER PLANT BACKGROUND Fukushima Daiichi Nuclear Power Plant (FDNPP) - Located on the east coast of Japan, 6 nuclear reactors are boiling water reactors (BWRs). The earthquake on 11 March severed off-site power to the plant and triggered the automatic shutdown of the three operating reactors - Units 1, 2, and 3. Control rods were inserted into the reactor cores, ending the fission chain reaction. The remaining reactors - Units 4, 5, and 6 -- had previously been shut down for routine maintenance. Backup diesel generators, designed to start with loss of off-site power, began providing electricity to pumps circulating coolant to the 6 reactors. The tsunami washed over the FDNPP, disabling the generators. Some batteries remained operable, but the site lost water circulation for reactor cooling. Over the ensuing days there was evidence of partial nuclear meltdowns in reactors 1, 2, and 3; hydrogen explosions destroyed the upper cladding of the buildings housing reactors 1, 3, and 4; an explosion damaged reactor 2's containment; and multiple fires broke out at reactor 4. Fears of radiation leaks led to a 30 km (18-mile) radius evacuation around the plant. Radioactive material was released on several occasions, due to both deliberate venting to relieve pressure, and uncontrolled (accidental) releases. These conditions resulted in radioactive contamination of the air, soil, drinking water, and seawater. Several large aftershocks and subsequent tsunami warnings have added to the difficulties faced by plant workers as they work to neutralize the situation at the FDNPP. IAEA BRIEFING 16:00 UTC: 20 APRIL 2011 WHO-WPRO SitRep 31: 20 April 2011 The crippled Fukushima Daiichi nuclear power plant in Okumamachi, Fukushima prefecture, northern Japan is seen in this March 24, 2011 aerial photo taken by small unmanned drone and released by AIR PHOTO SERVICE. UPI/Air Photo Service Co. Ltd.

3. AFTERSHOCKS On 17 April – 18:55 UTC : Several moderate aftershocks today, in the 4 to 5 magnitude range. On 16 April – 06:48 UTC : A strong aftershock at an intermediate depth in the greater Tokyo area. It was one of the first times that the epicenter of an aftershock came that close to Tokyo. 11 million people felt moderate shaking. UPDATE 13 April – 20:19 UTC : Very strong shallow magnitude 6.1 aftershock. Very strong and shallow aftershock but at a safe distance out of the coast (at least 100 km). 190 km (118 miles) E of Morioka, Honshu, Japan. At 05:07 UTC, 12 April, an earthquake with a magnitude of 6.0 occurred inland east of Honshu, Japan at a depth of 10.6 km. Distances from epicenter of the earthquake to NPP sites were; 46 km to Fukushima Daini, 53 km to Fukushima Daiichi, 72 km to Tokai, 165 km to Onagawa and 179 km to Kashiwazaki-Kariwa. At 23:08 UTC, 11 April, an earthquake with a magnitude of 6.2 occurred offshore of the East Coast of Honshu, Japan) at a depth of 13.1 km. Distances from epicenter of the earthquake to NPP sites were: 188 km to Tokai, 217 km to Fukushima Daini, 229 km to Fukushima Daiichi, 236 km to Hamaoka and 285 km to Kashiwazaki-Kariwa. More than 500 aftershocks have rocked Japan in the weeks since a 9.0 magnitude quake and the tsunami devastated the nation. After shock are likely to last into 2012, according to USGS. USGS Aftershock Map: 20 April 2011USGS Aftershock Map: 20 April 2011 JMA Tsunami Warning: 18 April 2011 CATDAT Update: 18 April 2011JMA Tsunami Warning: 18 April 2011CATDAT Update: 18 April 2011 AFTERSHOCKS IN THE LAST WEEK

4. SITUATION Japan imposed a 20-kilometer (12 mile) no-entry zone around the crippled Dai-Ichi nuclear power plant in Fukushima in the interests of public health JAIF EARTHQUAKE REPORT #58: 20 APRIL 2011 Japan imposed a 20-kilometer (12 mile) no-entry zone around the crippled Dai-Ichi nuclear power plant in Fukushima in the interests of public health. Entry into the zone will be banned except for authorized persons for emergencies and for temporary visits. About 80,000 people lived in the area before the March 11 earthquake and tsunami slammed into the plant, causing the worst nuclear disaster in 25 years. While the residents were evacuated, some have returned against the advice of officials. About 40 people are living in the area. One person per household will be allowed to return to their homes for a two-hour period to retrieve belongings, Residents whose homes were within three kilometers of the plant, though, won't be permitted to make a temporary visit,. Japanese police wearing chemical protection suits search for victims inside the 20 kilometer radius around the Fukushima Daiichi nuclear power plant in Minamisoma, Fukushima prefecture, Japan, on April 15, 2011. A massive earthquake and ensuing tsunami on March 11 destroyed homes, killed thousands and caused a nuclear disaster. UPI/Keizo Mori

5. SITUATION ROADMAP TO RECOVERY - On 17 April, the Ministry of Economy, Trade and Industry (METI) announced that TEPCO issued a roadmap for recovery which outlined 63 measures to be taken in two steps over a period of six to nine months. In the first stage over the next 3 months: -TEPCO aims to cool reactors 1 and 3 in a stable manner. It plans to cover fuel rods by injecting water into the containment vessels. -The company also plans to purify contaminated water and return it to the reactors as well as set ting up heat exchangers to remove heat from the reactors. -TEPCO says it will contain the radioactivity leakage from the Number 2 reactor by patching the damaged section before taking the same measures as at reactors 1 and 3. In the second stage: - TEPCO plans to lower the temperature of the fuel in the reactors to below 100 degrees Celsius to stabilize its condition. - Regarding the release of radioactive substances, it will set up water purification facilities to tackle highly contaminated water. TEPCO also plans to put giant covers over the reactor buildings to prevent the release of radioactive substances into the air. TRANSFER OF WATER - TEPCO has provided a plan to NISA for the transfer of highly contaminated water from the basement of the turbine building of Unit 2 to the main building of the radioactive waste treatment facilities, to reduce the risk of this stagnant waste water being discharged to the environment. Measures to ensure that the radioactive waste treatment facility is watertight were completed on 18 April and the transfer of water from Unit 2 was commenced on 19 April. ELECTRIC POWER SYSTEM - Work to strengthen the electrical power system between Units 1 - 2 and Units 3 - 4 was completed on 19 April. The nuclear accident at Fukushima Daiichi is now rated as a level 7 "Major Accident" on INES. IAEA BRIEFING 16:00 UTC: 20 APRIL 2011JAIF EARTHQUAKE REPORT #58: 20 APRIL 2011 RADIATION LEVELS: At the Fukushima Daiichi nuclear plant, high levels of radiation have kept workers from approaching the buildings housing the first 3 reactors, which lost their cooling functions in the March 11 earthquake and tsunami. On 15 April, the highest radiation level measured outside the double-entry doors of the Number 1 to 3 reactor buildings was 2 to 4 millisieverts per hour. Radiation levels measured between the double doors of those reactor buildings was 270 millisieverts in the Number One reactor, 12 in Number 2, and 10 in Number 3. The radiation level detected at the Number One reactor exceeds the national exposure limit of 250 millisieverts for nuclear contract workers. Tokyo Electric Power Company, TEPCO, has started using a remote-controlled robot inside the reactor buildings. ENVIRONMENTAL MONITORING Regarding environmental monitoring, in the first stage, TEPCO will increase the number of monitoring points within the government-set evacuation areas. In the second stage, it will carry out decontamination to reduce radiation levels in the area. TEPCO is conducting a program for seawater (surface sampling) at a number of near-shore and off-shore monitoring locations. Following a directive from NISA, on 16th April TEPCO announced they will increase the number of sea sampling points from 10 to 16. A further four points will be added at 3 km from the coast and two points will be added at 8 km from the coast (See map at right for new monitoring points, in green). MEXT initiated the off-shore monitoring program on 23 March and subsequently points 9 and 10 were added to the off-shore sampling scheme. On 4 April, MEXT added two sampling points to the north and west of sampling point 1. These are referred to as points A and B (see Map1: MEXT Seawater sampling Locations). The last results reported on 18 April (sampling date 15 April) showed that Cs-137 and I- 131 were detected at MEXT 4, 6 and 8. The highest concentrations were recorded at MEXT4 (below 200Bq/l for Cs-137 and about 160 Bq/l for I-131). At MEXT 6 and 8 sampling locations both C-s-137 and I-131 were reported at levels below about 40 Bq/l.

6. FUKUSHIMA DAIICHI NUCLEAR POWER PLANT NOTE: The IAEA has provisionally upgraded the situation at Fukushima Daiichi from Level 5 to Level 7 on the INES Scale. CURRENT STATUS Overall, the situation at the Fukushima Daiichi nuclear power plant remains very serious but there are early signs of recovery in some functions, such as electrical power and instrumentation. Tokyo Electric Power Company says radioactive debris and high humidity are hampering the investigation by robots at the Fukushima Daiichi nuclear plant.. TEPCO officials think that the steam is coming from the damaged section of the reactor's suppression pool. But they have not found a way to resolve the problem as the steam could be highly toxic. On 19 th April, about 3 containers worth of rubble was removed from the site. As of 20th April, white smoke was still observed coming from Units 2, 3 and 4. CHANGES TO FUKUSHIMA DAIICHI PLANT STATUS In Unit 1, fresh water is being continuously injected into the RPV through the feed-water line at an indicated flow rate of 6 m3/h using a temporary electric pump with off-site power. In Units 2 and 3, fresh water is being continuously injected through the fire extinguisher lines at an indicated rate of 7 m3/h using temporary electric pumps with off-site power. On 19th April 47 tons of fresh water was injected into the Unit 2 spent fuel pool. Stagnant water in the basement of the turbine building of Unit 6 was transferred to the condenser on 19 th April. There has been no change in the status in Units 5 or in Common Spent Fuel Storage Facility. Workers operate a modified Putzmeister 70Z, the world's largest concrete pump mounted on a truck, to pump contaminated water to the No.4 reactor at Fukushima Daiichi Nuclear Power plant in Fukushima Prefecture. Photo: REUTERS / TEPCO NISA Seismic Damage Information (103 rd Release) 08:00 UTC, 20 April 2011 IAEA BRIEFING 20 APRIL 2011 IAEA BRIEFING 20 APRIL 2011 JAIF EARTHQUAKE REPORT #58: 20 APRIL 2011 JAIF EARTHQUAKE REPORT #58: 20 APRIL 2011 REMOVAL OF RADIOACTIVE WATER TEPCO began moving the radioactive water to an on-site waste processing facility on 19 April. There was a reduction of 210 tons of the water in the tunnel of Unit 2, pumped out at a rate of 10 tons per hour. TEPCO is aiming to remove a total of 25,000 tons of the contaminated water out of the No. 2 turbine building basement and connecting tunnel to the nearby. They will monitor the current pumping rate for 10 days or more and then add more pumps, to move 10,000 tons of the radiated water by mid-May. The contaminated water levels are also rising in the basements of reactors No.5 and 6, and in tunnels connected to reactors No.3 and 4. They will transfer about 100 tons of contaminated water from the No.5 and No.6 reactors to condensers, to assess how much water is accumulating. Groundwater may have been seeping into the reactors' turbine buildings. TEPCO estimates a total of 67,500 tons of radioactive water has accumulated at the nuclear plant, which is hampering efforts to restore cooling systems.

7. Severe ConditionConcernNo Immediate Concern FUKUSHIMA DAIICHI NUCLEAR POWER PLANT Unit123456 Power (MWe /MWth)460/1380784/2381 1100/3293 Type of ReactorBWR-3BWR-4 BWR-5 Status at time of EQ In service – auto shutdown Outage Core and fuel integrity DamagedSevere damageDamagedNo fuel in the Reactor Cold Shutdown Being maintained using off-site electrical power and existing plant equipment. Cold Shutdown Being maintained using off-site electrical power and existing plant equipment. RPV & RCS integrity RPV temperature decreasing RPV temperature stable Not applicable due to outage plant status Containment integrityNo information Damage suspected AC Power AC power available - power to instrumentation – Lighting to Central Control Room AC power available – power to instrumentation – Lighting to Central Control Room BuildingSevere damageSlight damageSevere damage Water level of RPV Around half of Fuel is uncovered Not applicable due to outage plant status Pressure of RPVSlowly increasingStable CV Pressure DrywellStable Water injection to RPV Injection of freshwater – via mobile electric pump with off-site power Water injection to CVNo information Spent Fuel Pool Status Fresh water injection by concrete pump truck Freshwater injection to the Fuel Pool Cooling Line Freshwater injection via Fuel Pool Cooling Line and Periodic spraying Fresh water injection by concrete pump truck 20 April 2011 IAEA Summary of Reactor Unit Status

8. FUKUSHIMA DAIICHI NUCLEAR POWER PLANT UNITSITUATION UNIT 1 Unit 1 experienced an explosion on March 12, after attempts to vent gas from the containment. The explosion destroyed the outer shell of the building’s upper floors. Coolant within Unit 1 is covering about half of the fuel rods in the reactor, and Japanese authorities believe the core has been damaged. As of 26 March, lighting had been restored to the control center. Pooled water at the floor of Unit 1 showed high radiation levels (sampling on 27 March:.4mSv/hr). Transfer of stagnant water to the reactor condenser has been ongoing since 24 March. As of 1 April, the condenser is full. Drainage of the pooled water in the tunnel outside of the building of unit 1 to the suppression pool surge tank is now complete. Freshwater pumping to the RPV was established on 29 March, and continues. Fresh water is being continuously injected into the RPV through the feed-water line at an indicated flow rate of 6 m3/h using a temporary electric pump with off-site power. Water transfer from the condenser to the condensate storage tank was completed on 10 April. Nitrogen gas is being injected into the Unit 1 containment vessel to reduce the possibility of hydrogen combustion within the containment vessel. The pressure in this containment vessel has stabilized. The pressure in the RPV is increasing. As of 20 April, the temperature at the feed water nozzle of the RPV is 164 °C and at the bottom of the RPV is 114 °C. Work to strengthen the electrical power system between Units 1 and 2 is underway. UNIT 2 Coolant within Unit 2 is covering about half of the fuel rods in the reactor, and Japanese authorities believe the core has been damaged. TEPCO identified a possible leakage path of contaminated water from the Turbine building of Unit 2 to the sea via a series of trenches/tunnels used to provide power to the sea water intake pumps and supply of service water to the reactor and turbine buildings. On 4 April, a tracer was used in an attempt to determine where the water was coming from. On 5 April it was confirmed that the tracer was seen leaking from the crack into the sea. Coagulation agents (liquid glass) were injected into the holes drilled around the pits to block leakage of water. At 20:38 UTC on 5 April, it was reported that the leakage had stopped. Three steel plates were temporarily installed on 13 April on the ocean-side of the Inlet Bar screen to seal the leak. Approximately 660 tons of contaminated water were pumped from the trench to the condenser on 12 and 13 April. Fresh water is being continuously injected through the fire extinguisher lines at an indicated rate of 7 m3/h using temporary electric pumps with off-site power. Reactor Pressure Vessel and Drywell pressures remain at atmospheric pressure. An additional 60 T of fresh water was injected via the Spent Fuel Cooling System line to the spent fuel pool in Unit 2 by a temporary pump on 10 April. Fresh water injection (around 45 tons) to the spent fuel pool was carried out via the spent fuel pool cooling line of Unit 2 and completed by 16 April. Due to the occurrence of an earthquake on 16 April, the motor-driven pump was stopped. The spent fuel pool was confirmed to be filled with water. On 18th and 19 th April, approximately 25,000 L of coagulant was injected into the Power Cable Trench and the transfer of water from Unit 2 was commenced on 19 April. As of 20 April, the temperature at the feed water nozzle of the RPV is 133°C. White smoke was confirmed to generate continuous as of 20 April. UNIT 3 Unit 3 experienced an explosion on 14 March that destroyed the outer shell of the building’s 3rd floor. Concern about damage to the primary containment vessel and spent fuel pool remain. Lighting to the Central Control Room was restored on 22 March. Since 29 March, fresh water is being continuously injected through the fire extinguisher lines at an indicated rate of 7 m3/h using temporary electric pumps with off-site power. Pooled water at the floor of Unit 3 showed high radiation levels (sampling on 26 March: I-131 levels were 3.2 X 105 for Unit 3). The transfer of water from the Condensate Storage Tank to the Surge Tank of Suppression Pool was completed on 30 March at 23:37 UTC. On 14 April, a concrete pump truck began spraying fresh water into the spent fuel pool. The Reactor Pressure Vessel and Drywell pressures remain at atmospheric pressure. As of 20 April, The temperature at the feed water nozzle of the RPV is 99 °C and at the bottom of the RPV is 110 °C. White smoke was confirmed to generate continuous as of 20 April. UNIT 4 All fuel from Unit 4 had been removed from the reactor core for routine maintenance before the earthquake and placed into the spent fuel pool. The building's outer shell was damaged on 14 March, causing sever damage to the buildings upper floors. Authorities remain concerned that structural damage may have reduced cooling capabilities in the spent fuel pool. Lighting to the Central Control Room was restored on 29 March. Fresh water is being sprayed into the spent fuel pool using a concrete pump truck. White smoke was confirmed to generate continuous as of 20 April. On 14 April, a sample of the water in the spent fuel pool was collected for analysis.In accordance with NISA Release 94, TEPCO took water samples from the spent fuel pool of Unit 4 on 12 April, in order to examine the conditions. The sample was taken by using the arm of the concrete pump vehicle. At the same time, the temperature of water in the spent fuel pool of Unit 4 was measured with a thermistor attached to the arm of the concrete pump vehicle. The activities for I-131, Cs-134 and Cs-137 were 220 Bq/cm3, 88 Bq/cm3 and 93 Bq/cm3 respectively. UNITS 5 & 6 Shut down for routine maintenance before the earthquake. Instrumentation indicated rising temperatures at spent fuel pools starting 14 March. Both reactors achieved cold shutdown on 20 March. Workers have opened holes in the roofs of both buildings to prevent hydrogen gas accumulation, which is suspected of causing explosions at units 1 and 3. Outside power supply was restored to Units 5 and 6 on 22 March. As of April, the temperature in the spent fuel pools of Units 5 and 6 is stable at 32.8°C and 22.5°C, respectively. Both reactors remain in cold shutdown, with low pressure and water temperature; systems operating on off-site AC power. At 21:00 4 April, low- level radioactive groundwater in the sub-drain pit of units 5 and 6 (around 1,500t) was discharged through the water discharge canal to the sea. In order to make room for higher contaminated water from the turbine buildings and trenches, 1 343 T of low level contaminated water from Units 5 and 6 sub-drain pit were released to the sea from 4 to 9 April. In addition, 9 070 T of low-level contaminated water was discharged from the Central Radioactive Waste Disposal Facility to the south discharge point. Stagnant water in the basement of the turbine building of Unit 6 was transferred to the condenser on 19 th April. Commo n Spent Fuel Pools In addition to pools in each of the plant's reactor buildings, authorities were also concerned about rising temperatures in the Common Use Spent Fuel Pool, where spent fuel is stored after cooling for at least 18 months in the reactor buildings. Official confirmed fuel assemblies were fully covered by water on March 18. Outside power was available starting 24 March, and cooling began. Water spray by the concrete pump truck continues. On 3 April, the temperature was stable. On 10 April additional anti- scattering agent was sprayed in an area of about 550 m2 on the mountain-side of the Common Spent Fuel Pool to prevent the radioactive materials on the ground from being scattered. On 17 April the power supply to the Common Spent Fuel Pool was temporarily interrupted due to a short-circuit. As of 20 April, there has been no change in the status of the common spent fuel pool. IAEA BRIEFING 16:00 UTC: 20 APRIL 2011 NISA Seismic Damage Update (103rd Release: 20 April 2011)

9. GAMMA DOSE RATES IN μSv/hour 20 APRIL IAEA BRIEFING 16:30 UTC: 20 APRIL 2011 IAEA Brief Radiological Monitoring and Consequences 19 April 2011 METI: Readings of Environmental Radioactivity: 19 April 2011 Gamma dose rates are measured daily in all 47 prefectures. The values have tended to decrease over time. For Fukushima, on 20 April a dose rate of 1.9 µSv/h was reported. In the Ibaraki prefecture, a gamma dose rate of 0.13 µSv/h was reported; in all other prefectures, reported gamma dose rates were below 0.1 µSv/h. On 19 April, deposition of I-131 was detected in 13 prefectures, ranging from 1.8 to 368 Bq/m2. Deposition of Cs-137 was detected in seven prefectures, the values reported ranging from 2.4 to 160 Bq/m2. MEXT has set up an additional monitoring program and measurements of the gamma dose rates in 53 cities in 40 prefectures. As of 14 April, the gamma dose rates were below 0.1 µSv/h in 45 cities. In 8 cities, gamma dose rates ranged from 0.13 to 0.17 µSv/h. In Fukushima City, a value of 0.42 µSv/h was observed. NOTE: A person's radiation exposure due to all natural sources amounts on average to about 2.4 millisievert (mSv) per year.

10. ENVIRONMENTAL RADIOACTIVITY TRENDS AROUND FDNPP JAIF: Trend of Radiation in the Environment around FDNPP: 20 April 2011

11. ENVIRONMENTAL RADIOACTIVITY TRENDS BY PREFECTURE From 15 to 17 April, I-131 was detected in only one prefecture on 15 April; with a reported value of 4.1 Bq/m2. During this period, deposition of Cs-137 was detected in 8 prefectures. The total deposition of Cs-137 in these prefectures on these 3 days ranged from 2.3 to 66 Bq/m2. Only in a few prefectures, I-131 or Cs-137 is detectable in drinking water at very low levels. As of 16 April, one restriction for infants related to I-131 (100 Bq/l) is in place in a small scale water supply in a village of the Fukushima prefecture. On 15 and 16 April, the IAEA Team made measurements at 44 different locations in the Fukushima area at distances ranging from 20 to 58 km, West from the Fukushima nuclear power plant. At these locations, the dose rates ranged from 0.6 to 37 µSv/h. At the same locations, results of beta-gamma contamination measurements ranged from 0.03 to 2.8 Megabecquerel/m2. The highest values were observed at distances of less than 30 km from the power plant. On 19 April, MEXT released results of 108 reading points 20km to 62km outside of the Dai-ichi nuclear power plant, ranging from 0.1 to 46.8 uSv/h. The highest reading taken from a location about 20km North/ Northwest from Fukushima in Akougi Kunugidair town. JAIF: Trend of Radiation in the Environment around FDNPP: 20 April 2011 MEXT: Readings at Monitoring Post out of 20 Km Zone of Fukushima Dai-ichi NPP 20 April

12. A total of 1703 milk, produce and other food samples results have been obtained from the Ministry of Health, Labor and Welfare (MHLW) from 19 March to 20 April, with 59 sample results received since 18 April. One of the 59 food samples were above the provisional regulation value. The sample was a sand lance (small fish) from Fukushima Prefecture. MONITORING: Food monitoring data reported on 19 April covered a total of 36 samples. These were taken on 4, 18 and 19 April from eight prefectures (Chiba, Fukushima, Gunma, Ibaraki, Kanagawa, Nagano, Niigata and Saitama). Analytical results for 35 of the samples of various vegetables, shiitake mushrooms, fruit (strawberries), edible shoots (Japanese Angelica tree), seafood, yoghurt and unprocessed raw milk indicated that I-131, Cs-134 and Cs-137 were either not detected or were below the regulation values set by the Japanese authorities. One sample of seafood (sand lance) taken on 18 April from the coastal region of Fukushima had levels above the regulation values set by the Japanese authorities for I-131 and also for radioactive caesium. LIFTED RESTRICTIONS: A number of restrictions have been lifted in Fukushima and Ibaraki. On 16 April, the restriction on the distribution of raw unprocessed milk produced in Fukushima was lifted in 25 areas (Fukushima city, Nihonmatsu city, Date city, Motomiya city, Kunimi town, Otama village, Furudono city, Koriyama city, Sukagawa city, Tamura city (excluding former Toji village area), Miharu town, Ono town, Kagamiishi town, Ishikawa town, Asakawa town, Hirata village, Shirakawa city, Yabuki town, Izumisakivillage, Nakajima village, Saigo village, Samekawa village, Hanawa town, Yamatsuri town, Iwaki city). On 17 April, the restriction on the distribution of Kakina and parsley produced throughout Ibaraki prefecture was lifted. The restriction on the distribution of spinach from Ibaraki prefecture was also lifted with the exception of spinach produced in the cities of Kitaibaraki and Takahagi. FOOD SAFETY As of 18 April, Local level distribution restrictions in place include: Spinach from in Katori City and Tako Town; and spinach, garland chrysanthemum, parsley, qing-geng-cai, celery and Korean lettuce from in Asahi City (all in Chiba prefecture). RESTRICTIONS AS OF 20 APRIL: The GoJ has decided to set consumption limits for radioactive iodine in fishery products at 2,000 Bq/kg which is the same limit set for vegetables. On 20 April, the distribution and consumption of juvenile ikanago fish has been restricted for Fukushima Prefecture. Planting rice in soils with Cs above 5000 Bq/kg is banned. In Fukushima, there are restrictions on the consumption of leafy vegetables, headed and non-headed leafy vegetables, and flower-headed brassicas. There are also restrictions on the distribution of headed and non-headed leafy vegetables, flower-headed brassicas, spinach, kakina and unprocessed raw milk produced in the prefecture. Based on the test results of rice paddy soil around the FDNPP, the GoJ decided to regulate the planting of rice crops in the areas where it is likely that produced rice might exceed the provisional standard values established under the Food Sanitation Act. Farmers will be compensated for loss of the rice crops. Japan’s fishery ministry said it has ordered daily inspection of marine products caught off Ibaraki Prefecture, which is down-current from where contaminated radioactive water is being dumped into the ocean. IAEA BRIEFING 16:00 UTC: 20 APRIL 2011 WHO-WPRO SitRep 31: 20 April 2011

13. FOOD SAFETY 2 Subtotal and total percentages added by WPROWHO-WPRO SitRep 31: 20 April 2011 Food sampling results from MHLW for radioactive cesium and/or iodine, tested between 16 March and 19 April (Table provided by MHLW 2 )

14. FOOD SAFETY WHO-WPRO SitRep 31: 20 April 2011 As of 17 March 2011, all local food safety inspection authorities were directed to monitor/investigate radionuclide levels in foods for identification/prevention of potential food safety risks associated with radioactive nuclide contaminations. The notice indicates the provisional regulation values for radionuclide in different types of foods. Foods that exceed these levels are regulated under the Food Sanitation Act. As such, actions to prevent consumption of foods that exceed the provisional levels must be applied. Image: World Press Food sampling results from MHLW for radioactive cesium and/or iodine, tested between 16 March and 16 April (Table provided by MHLW)

15. RADIONUCLIDES IN DRINKING WATER WHOLE POPULATION – As of 20 April, the IAEA reported that iodine 131 and Cesium 137 were detectable at very low levels of contamination in a few prefectures and did not pose a health risk. INFANTS As of 20 April, the infant drinking restriction is still in place in Iitate Village, Fukushima Prefecture, implemented since 1 April, although the levels of I-131 remain well below the provisional limit for infants. The measure is a precaution only as readings of iodine 131 at all three treatment plants remain below provisional limits of 100 Bq/l. As of 18 April, the infant drinking restriction is still in place in Iitate Village, Fukushima Prefecture, although the levels of I-131 measurement remain well below the provisional limit for infants. Photo: Associated Press BACKGROUND - On 19 March, MHLW issued a notice to local governments that when the provisional regulation values for drinking water (300 Bq/kg for Iodine; 200 Bq/kg for Cesium) are exceeded, water supply utilities would notify the residents to refrain from drinking the water. On 21 March, MHLW issued an additional notice that for infants, the provisional regulation value for the intake of water is set at 100 Bq/kg. On 26 March, MHLW issued a notice to water supply utilities to stop or reduce intake of surface water, and cover water treatment facilities with plastic sheets, following rainfalls, where possible, which would reduce the Iodine levels in drinking water. IAEA BRIEFING 16:00 UTC: 20 APRIL 2011 WHO-WPRO SitRep 31: 20 April 2011

16. RADIONUCLIDES IN SEA WATER RADIATION LEVELS OF SEAWATER AT WATER DISCHARGE POINT OF FDNPP TEPCO: TEPCO is conducting a program for seawater (surface sampling) at a number of near- shore and off-shore monitoring locations. Since 5 April, a general downward trend in the concentration of radionuclides in sea water for all TEPCO sampling points has been observed, after a temporary increase on 4 after the discharge of contaminated water. Following a directive from NISA, on 16 April TEPCO announced they will increase the number of sea sampling points from 10 to 16. A further four points will be added at 3 km from the coast and two points will be added at 8 km from the coast. On 20 April no new data for TEPCO 1 - 4 sampling points were reported. For TEPCO 5 - 10, data for TEPCO 8 only were reported on 20 April (for sampling on 17 April). Both I-131 and Cs-137 were below 0.1 kBq/L MEXT: MEXT initiated the off-shore monitoring program on 23 March and subsequently points 9 and 10 were added to the off-shore sampling scheme. On 4 April, MEXT added two sampling points to the north and west of sampling point 1. These are referred to as points A and B. On 18 April (sampling date 15 April) readings showed that Cs-137 and I-131 were detected at MEXT 4, 6 and 8. The highest concentrations were recorded at MEXT 4 (below 200Bq/l for Cs-137 and about 160 Bq/l for I-131). At MEXT 6 and 8 sampling locations both C-s-137 and I-131 were reported at levels below about 40 Bq/l. Also, the I-131 seawater north and south of the discharge channels of Daiichi were 400 Bq/L and 180 Bq/L, respectively. The Cs-137 readings at these points were 740 and 540 Bq/L respectively. The latest results of I-131 and Cs-137 sampled on 18 April at 15 kms offshore from Iwasawa were 82 Bq/L and 110 Bq/L, respectively. All these concentrations were above the maximum permissible levels of I-131 and Cs-137 but have decreased from the last reported readings on 16 April. The results reported on 19th April (sampling date 17th April) showed that at the stations MEXT 5, 7 and 9, Cs-137 and I-131 are below 90 Bq/l. Both Cs-137 and I- 131 are “not detectable” at MEXT A and B. The highest levels are still measured close to the coast, namely 30m, 330m, and 10km near-shore even though with a decreasing trend. Concentration data from about 30 km off-shore show a generally decreasing temporal trend IAEA BRIEFING 16:00 UTC: 20 APRIL 2011 IAEA Marine Environment Monitoring Update: 19 April 2011 JAIF: Monitoring of Sea Water Near FDNPP - 21 April 2011 WHO-WPRO SitRep 31: 20 April 2011 MEXT AND TEPCO SAMPLING OF I-131 IN SEA WATER Sampling Points Around Fukushima NPPs As of 20 April 2011

17. RADIONUCLIDES IN SEA WATER The maximum permissible concentrations in seawater are 40 Bq/l for I-131 and 90 Bq/l for Cs-137. Values in excess of the Iodine-131 limit were detected at sampling points 3, 4 and 5 on 23 and 24 March but dropped below the limit on 25 March. On 30 March, the maximum permissible concentration of 40 Bq/l for I-131 was exceeded at sampling point 10. From samples taken 16 April, the highest concentrations were recorded at MEXT4 (below 200Bq/l for Cs-137 and about 160 Bq/l for I-131). Map 2: MEXT Seawater Sampling Locations Map 1: TEPCO Seawater Sampling Locations: NOTE: It can be expected that, if no additional releases occur, the levels measured at the stations 30 km off-shore will decrease significantly by dilution into deeper layers and dispersion by ocean currents. NOTE: It can be expected that, if no additional releases occur, the levels measured at the stations 30 km off-shore will decrease significantly by dilution into deeper layers and dispersion by ocean currents. IAEA BRIEFING 16:00 UTC: 20 APRIL 2011 WHO-WPRO SitRep 31: 20 April 2011 Readings of Sea Area Monitoring: NPP 20 April 2011

18. RADIONUCLIDES IN SEA WATER CONCERNS FOR MARINE PRODUCTS - Japan’s fishery ministry said it has ordered daily inspection of marine products caught off Ibaraki Prefecture. A ministry official criticized TEPCO for not informing it in advance before releasing the contaminated water into the ocean. The fishing industry is urging the GoJ to set permitted levels of iodine in marine products as soon as possible. The movements of all ships, including fishing boats, are restricted within a 30 km zone from the FDNPP, based on the hazardous area set by the Maritime Safety Agency. JAIF: Monitoring of Sea Water Near FDNPP – 20 April 2011

19. RADIONUCLIDES IN AIR AND SOIL RADIATION LEVELS IN THE SOIL The latest data for soil is available for 18 April; the readings of radioactivity in soil at all sampling points have generally been declining since 20 March, and remain about the same as previous readings. On 19 April, deposition of I-131 was detected in 13 prefectures, ranging from 1.8 to 368 Bq/m2. Deposition of Cs-137 was detected in seven prefectures, the values reported ranging from 2.4 to 160 Bq/m2. On 18 April, deposition of I-131 was detected in 6 prefectures ranging from 2.3 to 65 Bq/m2. Deposition of Cs-137 was detected in 2 prefectures; the values reported were 4.7 and 14.8 Bq/m2. On 17 th April, the IAEA team made measurements at 17 different locations in the Fukushima area at distances ranging from 20 to 62 km, North and Northwest from the Fukushima nuclear power plant. At these locations, the dose rates ranged from 0.4 to 3.3 µSv/h. At the same locations, results of beta-gamma contamination measurements ranged from 0.03 to 0.27 Megabecquerel/m2. On 17 April, TEPCO announced that that it plans to expand the monitoring of the evacuation area and then decontaminate the houses and soils in the area to reduce the level of radioactive materials within about 3 to 6 months. 8 April - The Ministry of Agriculture, Forestry and Fisheries (MAFF) announced that soil found to be above 5000bq/kg in Caesium cannot be used for rice planting. Farmers will be compensated. MEXT began publishing the results of the monitoring of radioactivity levels in soil on 18 March. Soil sampling has been done at a total of 36 points ranging from 20 kms to 55 kms from the Fukushima Daiichi NPP. The radioactivity levels of I-131 in all but the sampling point in Iitate Village (40 km northwest of the Fukushima Daiichi NPP) have been low and generally declining. In Iitate Village, the radioactivity peaked on 20 March (1.17 megaBq/kg for I-131 and 0.163 megaBq/kg for Cs-137) and has been declining since then. RADIATION LEVELS IN THE AIR Overall, radiation levels between a 20-km and 60-km distance from the NPP are declining or are stable. High radiation levels continue to be clustered around the NW area of the plant. The highest level of cumulative dose of I-131 as of 17 April was 17.01 mSv at 30 kms NW of the NPP. NOTE: Radiation levels in area ~30km NW of plant remain higher than normal, but there is continued decrease in radiation levels Cumulative doses at various locations between 20 kms and 60 kms are shown for I-131. The highest level as of 17 April was 17.01 mSv at 30 kms northwest of the Fukushima Daiichi plant JAIF Major Events Update 106 (FDNPP): 20 April 2011 WHO-WPRO SitRep 31: 20 April 2011

20. HEALTH CONCERNS LONG-TERM HEALTH EFFECTS Exposure to high doses of radiation can increase the risk of cancer. If I-131 is inhaled or ingested, it will concentrate in the thyroid gland and increase the risk of thyroid cancer. Among persons exposed to I-131, the risk of thyroid cancer can be lowered by taking potassium iodide pills, which helps prevent the uptake of the radioactive iodine. Risk of thyroid cancer following radiation exposure higher in children and young adults. ACUTE HEALTH EFFECTS If the dose of radiation exceeds a certain threshold level, it can produce acute effects, including skin redness, hair loss, radiation burns, and acute radiation syndrome. In a nuclear power accident, rescuers, first responders, and nuclear power plant workers may be exposed to doses of radiation high enough to cause acute effects, but usually not the general public. PERSONAL PROTECTIVE MEASURES (UPON EXPOSURE) Upon coming indoors after radiation exposure, undress in the doorway to avoid further contamination of home or shelter. Remove clothing and shoes and place them in a plastic bag. Seal the bag and place it in a safe location away from living areas, children, and pets. Shower or bathe with warm water and soap. Notify authorities of possibly contaminated clothing and personal belongings so that they can be handled appropriately and disposed of according to accepted national procedures. Potassium iodide pills are not “radiation antidotes”. They do not protect against external radiation, or against any other radioactive substances besides radioiodine. They may cause medical complications for some individuals with poorly functioning kidneys. KI should be taken only when there is a clear public health recommendation. The health risk posed by the short period of tap water intake exceeding the index values is extremely low. It is not intended to restrict drinking water (including infants’ ingestion of tap water) if there is no access to alternative drinking water. MLHW reports that tap water is safe for washing hands and bathing at home without any concern. CURRENT RISK GoJ’s recent actions in response to events at the FDNPP are in line with the existing recommendations for radiation exposure. The GoJ has evacuated individuals who were living within a 20-km radius around the FDNPP. GoJ announced that because of accumulated radiation contamination, it would encourage people to leave certain areas beyond its 20 km (12 mile) exclusion zone around the plant. Thousands of people could be affected by the move. Children, pregnant women, and hospitalized patients should stay out of some areas 20-30 km from the nuclear complex. On 11 April GoJ announced they will establish “Planned Evacuation Areas” and “Evacuation Prepared Area” in the areas beyond the 20km radius from the FDNPP. This decision is based on findings that areas beyond the 20km radius could be exposed to over 20mSv during the next year. RISK OF RADIOACTIVE EXPOSURE FROM FOOD CONTAMINATION There is a risk of exposure as a result of contamination in food. However, contaminated food would have to be consumed over prolonged periods to represent a risk to human health. A total of 1703 milk, produce and other food samples results have been obtained from the Ministry of Health, Labour and Welfare (MHLW) from 19 March to 20 April, with 59 sample results received since 18 April. One of the 59 food samples was above the provisional regulation value. The sample was a sand lance (small fish) from Fukushima. Only in a few prefectures, I-131 or Cs-137 is detectable in drinking water at very low levels. As of 17 April, one restriction for infants related to I-131 (100 Bq/l) is in place in a small scale water supply in a village of the Fukushima prefecture. RADIATION MONITORING On 19 April, deposition of I-131 was detected in 13 prefectures, ranging from 1.8 to 368 Bq/m2. Deposition of Cs-137 was detected in seven prefectures, the values reported ranging from 2.4 to 160 Bq/m2 Gamma dose rates are measured daily in all 47 prefectures, the values have tended to decrease. In Fukushima on 20 April, a gamma dose rate of 1.9 µSv/h was reported, and for Ibaraki prefecture a gamma dose rate of 0.13 µSv/h was reported. In all other prefectures, reported gamma dose rates were below 0.1 µSv/h On 19 April, measurements of the gamma dose rates were reported for 53 cities in 40 prefectures. In Fukushima City a value of 0.42 µSv/h was reported. For all other cities reported gamma dose rates were below 0.13 µSv/h. IAEA BRIEFING 16:00 UTC: 20 APRIL 2011 WHO-WPRO SitRep 31: 20 April 2011 MHLW Press Release: 17 April 2011

21. Map shows the radiation dose that would be received by people in the first year following the release of radioactive material from the Fukushima Daiichi plant. First-Year 2 rem Threshold People who did not evacuate this area before the releases occurred would be expected to receive 2 rem or greater dose if they remain in that area for one year following the release. This area is indicated by red. Those that did evacuate the red area prior to plant release (prior to 16 March) would be expected to receive less than a 2 rem dose. First-Year 100 millirem Threshold People who did not evacuate this area before the releases occurred would be expected to receive 100 millirem or greater dose if they remain in that area for one year following the release. This area is indicated by blue. Assumptions This dose estimate is conservative and assumes no dose reduction factor for spending time indoors. This dose estimate takes into account radioactive decay of the source material. This dose estimate includes the effects of external radiation due to material deposited on the ground and inhalation of re-suspended radioactive particles. Notes Based on 10 fixed-wing aerial surveys Dose conversion factor (DCF) computed for each flight to account for decay Computed dose based on NRC-supplied radionuclide mix, consistent with results to date for nuclides that have been measured FIRST-YEAR DOSE ESTIMATE COMMENCING MARCH 16, 2011: DOE Blog – 18 April 2011