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MODARIA II

Working Group 2

Assessment of Exposures and

Countermeasures in Urban Environments

Kathleen Thiessen, Ph.D.

Oak Ridge Center for Risk Analysis, Inc.

21-24 October 2019

MODARIA II

Vienna

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, October 2018

– 20+ participants, 17 countries

• Sixth meeting of WG2 in April 2019

– 15 participants, 12 countries

• Seventh meeting of WG2 this week

– 23+ participants, 19 countries

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)

Summary of WG2 Activities

• Short-range atmospheric dispersion exercises

– Boletice (new field test)

– Munich (hypothetical urban dispersion)

• Mid-range atmospheric dispersion exercises

– Šoštanj (Case 3, tracer exercise)

– Meteorological forecasting

– Chalk River (Ar-41 data set)

• Dose assessment exercise

– Fukushima

• Other activities

– Updates on related exercises (Casaccia, NERIS,

ASEAN benchmark modelling)

– Literature review, model review

Short-range Atmospheric Dispersion:

Boletice (field test)

Short-range Atmospheric Dispersion:

Munich (hypothetical urban dispersion)

Mid-range Atmospheric Dispersion:

Šoštanj Exercise (Case 3)

Mid-range Atmospheric Dispersion:

Weather Forecast Validation

27-28 July 2008

Mid-range Atmospheric Dispersion:

Chalk River Ar-41 Exercise

Urban Contamination and Remediation:

Fukushima exercise

Additional Activities

• Updates on related activities

– Modelling for Italian plant Casaccia

– NERIS experiment

– Southeast Asia benchmark modelling

Initial Literature Review

• Urban building

materials

– Retention,

penetration,

weathering

– Concrete and

asphalt

Continuation from MODARIA

• Model review

–Additional models

–Updates for some models

WG 2: MODARIA II report

Section Topic Lead Author Timescale

1 Introduction K Thiessen Dec 2019

2 Boletice exercise (field test) K Thiessen Jan 2020

3 Munich exercise (hypothetical) L Patryl, H Walter May 2020

4 Šoštanj exercise, case 3 (tracer) M Boznar, P Mlakar early 2020

5 Forecasting modelling M Boznar, P Mlakar early 2020

6 Chalk River (Ar-41 data set) M Pattantyús-Ábrahám early 2020

7 Related exercises (NERIS,

Casaccia, ASEAN)

H Walter, F Mancini, K Silva early 2020

8 Fukushima exercise S Takahara early 2020

9 Literature review (not definite) E Sim mid-2020

10 Summary, appendices K Thiessen mid-2020

Draft report for WG review Sections as prepared; full report, mid-2020

Draft report for IAEA review mid-2020

Proposed Title: Assessment of radioactive contamination,

exposures, and countermeasures in urban environments

Thank you!