Assessment of Exposures and Countermeasures in Urban Environments

Transcription

1 MODARIA II Working Group 2 Assessment of Exposures and Countermeasures in Urban Environments Kathleen Thiessen, Ph.D. Oak Ridge Center for Risk Analysis, Inc. 31 October - 4 November st MODARIA II Technical Meeting Vienna

2 Urban Working Groups VAMP, Urban WG ( ) EMRAS, Urban Remediation WG ( ) EMRAS II, Urban Areas WG ( ) MODARIA, Urban Environments WG ( ) MODARIA II, Urban Exposures WG ( )

3 Objective of the Urban Working Groups To test and improve the capabilities of models used in the assessment of radioactive contamination in urban environments Dispersion and deposition events Short-term and long-term contaminant redistribution following deposition events Effectiveness of potential countermeasures or remediation efforts for reducing contamination levels, human exposures, and doses Significance: improved support of decision making and communication with the public Planning ( What if...? ) Response (e.g., comparison of remediation strategies)

4 EMRAS, Urban Remediation Working Group Literature review Urban models Countermeasures Parameter values Pripyat exercise (Chernobyl data) No countermeasures Specified countermeasures Hypothetical short-term release to atmosphere No countermeasures Specified countermeasures

5 EMRAS II, Urban Areas Working Group Atmospheric dispersion, shortrange field tests Atmospheric dispersion, midrange hypothetical NPP accident Contaminant transport and countermeasures hypothetical deposition event

6 MODARIA, Urban Environments Working Group Atmospheric dispersion, short-range (additional field tests) Atmospheric dispersion, mid-range (tracer data) Comparison of decisionsupport systems (hypothetical dispersion situation) Contaminant transport and countermeasures (Fukushima data, initial stage of exercise) Review of atmospheric dispersion models

7 MODARIA II, Urban Exposures Working Group First meeting of WG2 this week Continuation of some earlier exercises Development of new exercises Possible collaboration with other Working Groups WG3 (planned releases, tritium data set)

8 Contaminant transport and countermeasures Fukushima data set Remediation experiments Population habits Dose assessment, comparison of assessed and measured doses

9 Atmospheric dispersion to urban areas Additional situations from Šoštanj TPP (Slovenia) Tracer data, complex terrain and meteorology 3-D models, meteorological forecasting Possible tritium data set (with WG3) Other possibilities

10 Short-range atmospheric dispersion Data set from new field test (Czech Republic, Boletice) Hypothetical situations in urban environments

11 Possible new topics Indoor contamination Penetration into buildings Dispersion and deposition indoors Relative importance of indoor and outdoor contamination Remediation of indoor surfaces Building materials and urban surfaces Initial retention, transport, and weathering on/in various urban surfaces Shielding effects of various building types Remediation approaches Literature reviews?

12 Sewer systems Transfer to sewer systems Dispersion within sewer systems Exposures to humans from contamination in sewer systems Possible new topics Aircraft Impacts on aircraft flying through a plume from an unplanned release Alteration of flight plans based on predicted path and dispersion of plume

13 Preliminary Agenda for WG2 Monday afternoon Tuesday morning Tuesday afternoon Wednesday morning Wednesday afternoon Thursday morning Thursday afternoon Overview, possible topics, plans Contaminant transport and countermeasures (Fukushima exercise, etc.) Joint session with WG3 (tritium releases) Various topics Atmospheric dispersion to urban areas (Šoštanj exercise, etc.) Short-range atmospheric dispersion (Field tests, urban dispersion, etc.) Various topics Summary and plans for WG activities