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“Nuclear Radiation, Environment and Energy” Workshop

“Nuclear Radiation, Environment and Energy” Workshop. General discussion on the Daya Bay contingency plan ( 大亞灣應變計劃 的通識 討論 ). 香港理工大學應用物理系 王碧裕. -50 km from Tsim Sha Tsui. Platform of spreading. -release of radioactive fission products ( 放射性裂變產物 ) into the atmosphere. radioactive plume

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“Nuclear Radiation, Environment and Energy” Workshop

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  1. “Nuclear Radiation, Environment and Energy” Workshop General discussion on the Daya Baycontingency plan (大亞灣應變計劃的通識討論) 香港理工大學應用物理系 王碧裕

  2. -50 km from Tsim Sha Tsui

  3. Platform of spreading -release of radioactive fission products (放射性裂變產物) into the atmosphere radioactive plume (輻射煙羽) Iodine-131Half-life: 8 days gaseous and volatile Ingestion of contaminated foodstuffs and drinking water Cesium-137 Half-life: 30 years Water-soluble

  4. TECHNICAL WORKING GROUP (技術工作小組) - Secretary for Security or his representative (Chairman) Decision on the activation level of the plan (決定應變計劃的動階段) • Technical advice from these key departments 2. IAEA four-category system (國際原子能機構的四級分類系統) (classifying nuclear power emergencies) 1. Plume Exposure Pathway Counter-measure (煙羽防護措施) 2. Ingestion Pathway Counter-measure (飲食防護措施)

  5. Counter-measures 1. Plume Exposure Pathway Counter-measure (煙羽防護措施) (a) Evacuation or sheltering (疏散或掩蔽) (i)Evacuation (疏散) -only apply to Ping Chau (坪洲) (within 20 kmof the nuclear plant) (ii)Sheltering (掩蔽)

  6. Counter-measures 1. Plume Exposure Pathway Counter-measure (煙羽防護措施) (b) Monitoring the radiation level (輻射水平監測)of - persons who have been within the 20 km range - incoming cargo (c) Issue of potassium iodate tablet (派發碘酸鉀藥片) 2. Ingestion Pathway Counter-measure (飲食防護措施) (a) Control of food and livestock (食物及禽畜管制) -1000 Bq/kg (b) Control of water (水質管制)

  7. Operational criteria for evacuation (IAEA)

  8. Major factors that affect the spreading of plume • Distance • Dilution by the atmosphere Air Dose Rate Readings on 17th March, 2011 =170.0µSv/hr

  9. Major factors that affect the spreading of plume • Distance • Dilution by the atmosphere Criteria for evacuation: > 297.62µSv/hr MODEL 1:

  10. Major factors that affect the spreading of plume • Distance • Dilution by the atmosphere MODEL 2: Spread in “sphere”

  11. Major factors that affect the spreading of plume • Distance • Dilution by the atmosphere Criteria for evacuation: > 297.62µSv/hr MODEL 2: Spread in “sphere”

  12. Uncertainties that affect the spreading of plume 1. Size of explosion 2. Weather (Wind, Rain) Rain:- rainfall greatly enhance the deposition rate → Radiation level in air ↓ Wind:- winddirection affectthedirection of dispersion - windspeed affecttherate of dispersion

  13. “First assessment indicates that one of the IAEA operational criteria for evacuation is exceeded in Iitate village.” --- IAEA

  14. Time for the evacuation zone to safety level Reference data: Akogi Teshichiro, Namie Town, Futaba County (双叶郡浪江町赤宇木手七郎) http://eq.wide.ad.jp/index_en.html (April 24th version -http://eq.wide.ad.jp/files_en/110424map_1800rev2_en.pdf) - 31km from Fukushima Dai-ichi Nuclear Power Plant Criteria for evacuation : > 297.62µSv/hr 17/3/2011 – 23/4/2011

  15. Time for the evacuation zone to safety level <11.42µSv/hr

  16. THE END

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