“nuclear radiation, environment and energy” workshop
DESCRIPTION
“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 - PowerPoint PPT PresentationTRANSCRIPT
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This work by Wong Pik Yu of the Department of Applied Physics, The Hong Kong Polytechnic University is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Hong Kong License To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/hk/deed.en_HK
“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
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This work by Wong Pik Yu of the Department of Applied Physics, The Hong Kong Polytechnic University is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Hong Kong License To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/hk/deed.en_HK
-50 km from Tsim Sha Tsui
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This work by Wong Pik Yu of the Department of Applied Physics, The Hong Kong Polytechnic University is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Hong Kong License To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/hk/deed.en_HK
Platform of spreading
radioactive plume(輻射煙羽 )Iodine-131Half-life: 8 daysgaseous and volatile
Ingestion of contaminated foodstuffs and drinking waterCesium-137Half-life: 30 yearsWater-soluble
-release of radioactive fission products (放射性裂變產物 ) into the atmosphere
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This work by Wong Pik Yu of the Department of Applied Physics, The Hong Kong Polytechnic University is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Hong Kong License To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/hk/deed.en_HK
TECHNICAL WORKING GROUP ( 技術工作小組 ) - Secretary for Security or his representative (Chairman)
2. IAEA four-category system (國際原子能機構的四級分類系統 ) (classifying nuclear power emergencies)
Decision on the activation level of the plan ( 決定應變計劃的動階段 )
1. Technical advice from these key departments
Four-category system (四級分類系統 )
Counter-measures in activation levels ( 動階段 )
3. Site Emergency (站址緊急情況 )
4. Off-Site Emergency (站外緊急情況 )
1. Plume Exposure Pathway Counter-measure
( 煙羽防護措施 )2. Ingestion Pathway Counter-measure
( 飲食防護措施 )
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This work by Wong Pik Yu of the Department of Applied Physics, The Hong Kong Polytechnic University is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Hong Kong License To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/hk/deed.en_HK
1. Plume Exposure Pathway Counter-measure ( 煙羽防護措施 )
Counter-measures
(a) Evacuation or sheltering ( 疏散或掩蔽 )
-only apply to Ping Chau (坪洲 )
(within 20 km of the nuclear plant)
(ii)Sheltering (掩蔽 )
(i)Evacuation (疏散 )
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This work by Wong Pik Yu of the Department of Applied Physics, The Hong Kong Polytechnic University is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Hong Kong License To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/hk/deed.en_HK
1. Plume Exposure Pathway Counter-measure ( 煙羽防護措施 )
Counter-measures
(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 )
(b) Control of water (水質管制 )
-1000 Bq/kg
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This work by Wong Pik Yu of the Department of Applied Physics, The Hong Kong Polytechnic University is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Hong Kong License To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/hk/deed.en_HK
Operational criteria for evacuation (IAEA)
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This work by Wong Pik Yu of the Department of Applied Physics, The Hong Kong Polytechnic University is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Hong Kong License To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/hk/deed.en_HK
Air Dose Rate Readingson 17th March, 2011
=170.0µSv/hr
Major factors that affect the spreading of plume1. Distance2. Dilution by the atmosphere
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This work by Wong Pik Yu of the Department of Applied Physics, The Hong Kong Polytechnic University is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Hong Kong License To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/hk/deed.en_HK
Major factors that affect the spreading of plume1. Distance2. Dilution by the atmosphere
Criteria for evacuation:> 297.62µSv/hr
MODEL 1:
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This work by Wong Pik Yu of the Department of Applied Physics, The Hong Kong Polytechnic University is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Hong Kong License To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/hk/deed.en_HK
Spread in “sphere”
Major factors that affect the spreading of plume1. Distance2. Dilution by the atmosphere
MODEL 2:
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This work by Wong Pik Yu of the Department of Applied Physics, The Hong Kong Polytechnic University is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Hong Kong License To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/hk/deed.en_HK
Major factors that affect the spreading of plume1. Distance2. Dilution by the atmosphere
Spread in “sphere”km µSv/hr
22 475.6264
23 416.2464
24 366.3534
25 324.1261
26 288.1469
27 257.3017
28 230.7065
29 207.6539
30 187.573
Criteria for evacuation:> 297.62µSv/hr
MODEL 2:
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This work by Wong Pik Yu of the Department of Applied Physics, The Hong Kong Polytechnic University is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Hong Kong License To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/hk/deed.en_HK
Wind:- wind direction
affect the direction of dispersion
- wind speed affect the rate of dispersion
Uncertainties that affect the spreading of plume1. Size of explosion2. Weather (Wind, Rain)
Rain :- rainfall greatly enhance the deposition rate → Radiation level in air ↓
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This work by Wong Pik Yu of the Department of Applied Physics, The Hong Kong Polytechnic University is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Hong Kong License To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/hk/deed.en_HK
“First assessment indicates that one of the IAEA operational criteria for evacuation is exceeded in Iitate village.” --- IAEA
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This work by Wong Pik Yu of the Department of Applied Physics, The Hong Kong Polytechnic University is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Hong Kong License To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/hk/deed.en_HK
Reference data:Akogi Teshichiro, Namie Town, Futaba County (双叶郡浪江町赤宇木手七郎 )- 31km from Fukushima Dai-ichi Nuclear Power Plant
Time for the evacuation zone to safety level
17/3/2011 – 23/4/2011Criteria for evacuation : > 297.62µSv/hr
http://eq.wide.ad.jp/index_en.html (April 24th version -http://eq.wide.ad.jp/files_en/110424map_1800rev2_en.pdf)
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This work by Wong Pik Yu of the Department of Applied Physics, The Hong Kong Polytechnic University is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Hong Kong License To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/hk/deed.en_HK
Days µSv/hr
232 11.53592
233 11.50164
234 11.4676
235 11.43381
236 11.40026
237 11.36696
238 11.33388
239 11.30105
240 11.26844
Time for the evacuation zone to safety level
<11.42µSv/hr
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This work by Wong Pik Yu of the Department of Applied Physics, The Hong Kong Polytechnic University is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Hong Kong License To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/hk/deed.en_HK
THE END