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MODARIA II
Working Group 2
Exposures in Urban Environments
following Accidents
Kathleen Thiessen, Ph.D.
Oak Ridge Center for Risk Analysis, Inc.
22-25 October 2018
MODARIA II
Vienna
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)
MODARIA II, Urban Exposures Working Group
• First meeting of WG2 in fall 2016
– 26 participants, 20 countries
• Second meeting of WG2 in May 2017
– 16 participants, 14 countries
• Third meeting of WG2 in October-November 2017
– 24 participants, 16 countries
• Fourth meeting of WG2 in April 2018
– 15 participants, 13 countries
• Fifth meeting of WG2 this week
Extensions of earlier work
• Šoštanj exercise
–Atmospheric dispersion
–Tracer data
–Additional meteorological situations
–Forecasting
Extensions of earlier work
• Remediation exercise
– Dose assessment, countermeasures
http://ja.wikipedia.org/wiki/%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB:Fukushima_City_with_a_view_of_Fukushima_Station.jpg
Development of new exercises
• Boletice
– New field test
• Urban dispersion
exercise
– Hypothetical release
• Ar-41 data set
– Atmospheric dispersion
– Collaboration with WG3
Extensions of earlier work
• Model review
–Additional models
–Updates for some models
Initial Literature Reviews
• Urban building
materials
– Retention,
penetration,
weathering
– Concrete and
asphalt
• Sewer systems
Preliminary Agenda for WG2
Monday afternoon Overview and plans for the week
Urban contamination and remediation exercise
Tuesday
morning
afternoon
Short-range atmospheric dispersion
Urban scenarios
Boletice exercise
Wednesday
morning
afternoon
Contaminant transport from external locations
Southeast Asia benchmark modelling
Chalk River (Ar-41) exercise
Šoštanj exercise (forecast modelling)
Working Group plans
Thursday afternoon Remaining discussion and business, as needed
Thank you!