Technical Briefing on Radiological Situation in Japan - 21 March 2011
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Technical Briefing on Radiological Situation in Japan - 21 March 2011

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Technical Briefing on Radiological Situation in Japan - 21 March 2011

Technical Briefing on Radiological Situation in Japan - 21 March 2011

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Technical Briefing on Radiological Situation in Japan - 21 March 2011 Technical Briefing on Radiological Situation in Japan - 21 March 2011 Document Transcript

  • Opening Remarks – Technical Briefing (21/3/2011)1. Current SituationWe are seeing some steady improvements, but the overall situation at the Fukushima Daiichinuclear power plant remains very serious. High levels of contamination have been measuredin the locality of the plant.The restoration of electrical power to Unit 2, which we reported yesterday, is good news. ACpower is available and an electrical load check to pumps etc. is currently on-going. Work onthe restoration of off-site power to Units 3 and 4 is also underway.Seawater is still being injected into the reactor pressure vessels of Units 1, 2 and 3.Pressure in the reactor pressure vessel and the containment vessel drywell at Unit 3, whichhad been rising yesterday, has again fallen.Water is being sprayed periodically into the spent fuel pools at Units 2, 3 and 4. The Agencystill lacks data on water levels and temperatures in the spent fuel pools at Units 1, 2, 3 and 4.Following the restoration of cooling at Units 5 and 6, temperatures in the spent fuel poolscontinue to decline.2. Radiation MonitoringAs I reported yesterday, the IAEA radiation monitoring team took measurements at distancesfrom 56 to 200 km from the Fukushima nuclear power plant. At two locations in FukushimaPrefecture gamma dose rate and beta-gamma contamination measurements have beenrepeated. These measurements showed high beta-gamma contamination levels. Measurementsby the IAEA and the Japanese authorities were taken at the same time and locations. TheJapanese and independent IAEA measurements gave comparable results.Measurement of gamma dose rate and beta-gamma contamination were taken on 20 March atmore locations. The dose-rate results ranged from 2-160 microsieverts per hour, whichcompares to a typical natural background level of around 0.1 microsieverts per hour. High-levels of beta-gamma contamination have been measured between 16-58 km from the plant.Available results show contamination ranging from 0.2-0.9 MBq per square metre.Further measurements are needed to assess possible contamination beyond the area currentlymonitored – both closer to the facility and further way. We have no contaminationmeasurements showing that that contamination levels are high at greater distances than 58 kmfrom the plant, but this cannot be excluded.I have no further information available regarding the measurement of alpha radiation. As Ireported yesterday, from the measurements taken within the evacuation zone (20 km), nosignificant alpha radiation had been detected at that time.In the coming days, the IAEA monitoring team will continue to take measurements in theFukushima prefecture. We are seeking data from Japan on radioactivity contaminationmeasurements for the rest of Japan.
  • Some results on the monitoring of foodstuffs have been made available by Japan to the IAEAand FAO. Results provided recently by the Japanese authorities range up to 55,000 Bq per kgof I-131 in samples of Spinach taken in in the Ibaraki Prefecture. These high values aresignificantly above Japanese limits for restricting food consumption (i.e. 2,000 Bq/kg). Iunderstand that the Japanese Government is actively considering relevant precautionarymeasures and has instructed four Prefectures (Ibaraki, Totigi, Gunma, Fukushima) to refrain,for the time being, from distributing two types of vegetables (spinach and kakina) from thesePrefectures and milk from Fukshima.3. Agency ActivitiesThe Director General briefed the Board of Governors today on the outcome of his visit toTokyo.
  • Unit 1 2 3 4Power (MWe /MWth) 460/1380 784/2381 784/2381 784/2381Type of Reactor BWR-3 BWR-4 BWR-4 BWR-4 In service – auto In service – auto In service – autoStatus at time of EQ Outage shutdown shutdown shutdownCore and fuel integrity Damaged Damaged Damaged No fuel in the ReactorRPV & RCS integrity Unknown Unknown Unknown Not applicable due toContainment integrity Not Damaged Damage suspected No information outage plant status AC Power available –AC Power Substation connected Not available Not available Load check is ongoingBuilding Severe damage Slight damage Severe damage Severe damage Around half of Fuel is Around half of Fuel is Around half of Fuel isWater level of RPV uncovered (Stable) uncovered (Stable) uncovered (Stable)Pressure of RPV Stabilized Unreliable Readings Decreased Not applicable due toCV Pressure Drywell Stable Stable Decreased outage plant statusWater injection to RPV Seawater Seawater SeawaterWater injection to CV No information No information No information Periodic spraying from Periodic spraying from Periodic sprayingSpent Fuel Pool Status No information outside outside from outside3/21/2011 07:00 AM
  • Unit 5 6 Power 784/2381 1100/3293 Type of Reactor BWR-4 BWR-5 Status at the EQ occurred Outage Outage Core and Fuel Cold Shutdown Cold Shutdown Severe condition RPV & RCS integrity Intact Intact Containment int. No damage expected No damage expected Concern AC Power 2nd Emergency diesel from Emergency diesel Unit 6 Off-site power being restored No immediate concern Building No damage reported No damage reported Water level of RPV Above fuel Above fuel Pressure of RPV Cooling restored Cooling restored Containment Pressure No information No information Water injection to RPV Injection in Progress Injection in Progress Water injection to CV Not needed now Not needed now Spent Fuel Pool Status Cooling restored Cooling restored3/21/2011 07:00 AM
  • Technical Briefing on theRadiological Situation in Japan 21 March 2011 IAEA International Atomic Energy Agency
  • Daiichi NPP On-Site gamma dose rate(updated) IAEA
  • Evolution of gamma dose rates after radioactive releasessurrounding Daiichi NPP since 15 March 2011(Selected monitoring posts) IAEA Information provided by MEXT-Japan
  • Gamma dose rates North of Daiichi NPPJapan (microSv/h), 15-20 March IAEA
  • Gamma dose rates between Tokyo and DaiichiNPP (microSv/h), 15-20 March IAEA
  • Gamma dose rates close to Tokyo, (microSv/h),15-20 March IAEA
  • Measurements by the IAEA monitoring team on 20 March 2011 Location Distanc Time, JST Dose rate Alpha beta +  Contamination e to (24h) micro  (counts  gamma Becquerel per  Mega‐ NPP Sv/h per  (counts per  cm 2 Becquerel  (km) second) second) per m2Mini Stop near Kawamata Hospital 58 10:32 5.7 0 3440 58.5 0.585Nihonmatsu‐Towa‐cho 52 10:55 4.2 0 2368 40.3 0.403Towa‐cho Michino‐eki 49 11:05 3.1 0 1270 21.6 0.216At crossing of Road 349 and Road 50 46 11:30 1.9 0 1973 33.5 0.335Suichuji bus stop 43 11:42 2 0 2260 38.4 0.384JA Tamura 39 11:57 2.6 0 2265 38.5 0.385Border between Kuzuo‐mura and  34 12:09 11.7 0 3152 53.6 0.536Tamura‐shiKuzuo village office 29 13:47 11.2 0 4874 82.9 0.829Road 50 28 15:25 7.2 0 5030 85.5 0.855Border between Namie town and  20 14:55 161 0 overload na naKuzuo villageGate of Ogaki‐dam management office 16 14:31 83 0 overload na na IAEA 7
  • Measurements by the IAEA monitoring team on 19 March 2011Location Time,  Distance  Dose  Alpha beta +  Contamination JST from  rate  (counts  gamma (24h) Fukushim (micro  per  (counts per  a Sv/h) second) second) Becquerel  Mega‐ Daiichi  per cm2 Becquerel  NPP (km) per m2 Saitama  PrefectureHasuda 17:00 200 0.04 0 27 ‐ - Tochigi   Prefecture Sano 17:27 180 0.16 0 150 2.5 0.03Kamikochi 18:17 140 0.18 0.2 *) 240 4.1 0.04Nasukogem 20:17 220 2.9 0 2300 39.3 0.39 Fukushimi  PrefectureAbukuma 21:05 60 3.5 0.08*) 3750 64 0.64Gohyakugawa 21:58 56 3 0 3900 66.3 0.66 IAEA 8
  • Maps with prefectures where foodstuffswere measured IAEA 9
  • Ibaraki: Results from measurements ofradionuclides in foodstuffs Name Sampling Date Spniach & other leafy vegs Spring Onion Milk (unprocessed) UNITS JST I‐131 Cs‐137 I‐131 Cs‐137 I‐131 Cs‐137 Cs‐134Kitaibaraki 18‐Mar 24000 690 350 ND ‐ ‐ ‐ (Bq/kg)Kamisu 17‐Mar 56 ND ‐ ‐ ‐ ‐ ‐ (Bq/kg)Yachiyo 17‐Mar 78 21 ‐ ‐ ‐ ‐ ‐ (Bq/kg)Takahagi 19‐Mar 11,000 586 ‐ ‐ ‐ ‐ ‐ (Bq/kg)Hokota 19‐Mar 1900 71 ‐ ‐ ‐ ‐ ‐ (Bq/kg)Hokota 19‐Mar 480 81 ‐ ‐ ‐ ‐ ‐ (Bq/kg)Hitachi City 18‐Mar 54100 1931 ‐ ‐ ‐ ‐ ‐ (Bq/kg)Hitachi City 18‐Mar 25200 1105 ‐ ‐ ‐ ‐ ‐ (Bq/kg)Hitachi Omiya 18‐Mar 19200 1040 ‐ ‐ ‐ ‐ ‐ (Bq/kg)Hitachi Omiya 18‐Mar 17800 908 ‐ ‐ ‐ ‐ ‐ (Bq/kg)Naka 18‐Mar 16100 911 ‐ ‐ ‐ ‐ ‐ (Bq/kg)Naka 18‐Mar 13500 966 ‐ ‐ ‐ ‐ ‐ (Bq/kg)Hokota 18‐Mar 7710 407 356 9 ‐ ‐ ‐ (Bq/kg)Moriya 18‐Mar 2100 121 590 21 ‐ ‐ ‐ (Bq/kg)Moriya 18‐Mar 26 ND ‐ ‐ ‐ ‐ ‐ (Bq/kg)Moriya 18‐Mar ND ND ‐ ‐ ‐ ‐ ‐ (Bq/kg)Koga 18‐Mar 4200 270 ‐ ‐ ‐ ‐ ‐ (Bq/kg)Sakai 18‐Mar ‐ ‐ 140 ND ‐ ‐ ‐ (Bq/kg)Sakai IAEA 18‐Mar ‐ ‐ 120 ND ‐ ‐ ‐ (Bq/kg)