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!