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
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
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
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 )
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 )
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
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)
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
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:
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:
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:
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 ↓
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
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 – 23/4/2011 Criteria 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)
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
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
