working group 9 - international atomic energy agency · 2010-02-15 · progress to date • three...
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Working Group 9“Urban” Areas
Kathleen Thiessen, WG Leader
Progress Report25 January 2010
2nd EMRAS II Technical MeetingIAEA Headquarters, Vienna
25–29 January 2010
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Interim meeting in Prague July 2009
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Progress to date
• Three modelling exercises have been identified– Atmospheric dispersion, short-range– Atmospheric dispersion, mid-range– Contaminant transport and countermeasures
• Draft scenario descriptions have been developed
• Some preliminary calculations have been made for two scenarios
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Atmospheric dispersion, short-range
• Dispersion from several test explosions– Two tests will be used for model calibration– Two for will be used for blind testing of model predictions
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Atmospheric dispersion, short-range
• Comparison of model predictions with measurements– Contamination densities– Dose rates
• Model intercomparison for additional endpoints– Activity concentrations in air– 95% contamination zone– Dispersion in the presence of structures (obstacles)
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Atmospheric dispersion, short-range
• Plans for this meeting:– Discuss the July 2009 test– Identify any information needed to complete the scenario
description– Present and discuss modelling approaches and preliminary
calculations– Develop schedule for completion of exercise
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Atmospheric dispersion, mid-range
• Dispersion from a hypothetical NPP accident– Rupture of a steam generator tube– 1 hour, variable release rates– Cs-137 and I-131
• Deposition in an urban environment– Geographical information for Trillo NPP (Spain)– Deposition in a small town (Guadalajara) and a big city
(Madrid)• Model intercomparison exercise
– Deposition– Activity concentrations in air
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Atmospheric dispersion, mid-range
• Plans for this meeting:– Identify any information needed to complete the scenario
description– Present and discuss modelling approaches and preliminary
calculations– Develop schedule for completion of exercise
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Contaminant transport andcountermeasures
• Two situations– Predicted deposition from NPP dispersion exercise– Defined deposition, detailed description of part of a city
(Seoul)
• Model intercomparison exercise– Contamination densities– Dose rates and doses– With and without countermeasures
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Seoul scenario- Unspecified deposition events- Pu-239 and Co-60 (considered separately)- Business area and park area- Effects of weather and season
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Contaminant transport andcountermeasures
• Plans for this meeting:– Identify information needed to complete the scenario
description (Seoul)– Present and discuss modelling approaches– Develop schedule for completion of exercise (Seoul)– Plan development of scenario description based on NPP
exercise
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Summary of meeting plans
• Discuss status of each exercise, including information needs
• Present and discuss modelling approaches and preliminary calculations
• Develop schedules for completion of the exercises