IAEAInternational Atomic Energy Agency

Overview of IAEA MODARIA II Working Group 1

Tamara Yankovich, Ph.D.International Atomic Energy Agency

Ming Zhu, Ph.D., PE, PMPU.S. Department of Energy, Office of Environmental Management

Presented to P&RA CoP Annual Technical Exchange Meeting

October 18-19, 2017

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Objectives of IAEAModel Validation Programs

To improve capabilities in the field of environmental dose assessment by means of acquisition of improved data for:

• Model testing and comparison

• Reaching consensus on

modeling philosophies

• Sharing of approaches and

parameter values

• Development of improved

methods

• Information exchange

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Past International Model Validation Programmes:

• VAMP: Validation of Model Predictions (1988-1996)

• Mainly scenarios from Chernobyl release

• Transfer data collection

• BIOMOVS: BIOspheric Model Validation Study, with SSI, Sweden, 1991-1996

• short- and long-term releases

• power reactors, solid waste disposal repositories, uranium mill tailings

• BIOMASS (1996-2001)

• Chernobyl scenarios

• Environmental clean-up

• Long-term environmental impact of waste disposal: Reference biospheres

• EMRAS (2003-2007)

• Scenarios from routine and accident situations

• Transfer data review and update

• Biota model testing and comparison

• EMRAS II (2009-2011)

• Continuation of EMRAS

• MODARIA (MOdelling and DAta for Radiological Impact Assessments, 2012-2015)

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MODARIA II: Working Groups

• Working Group 1 - Assessment and Decision Making of Existing Exposure Situations for NORM and Nuclear Legacy Sites

• Working Group 2 - Assessment of Exposures and Countermeasures in Urban Environments

• Working Group 3 - Assessments and Control of Exposures to the Public and Biota for Planned Releases to the Environment

• Working Group 4 - Transfer Processes and Data for Radiological Impact Assessment

• Working Group 5 - Exposure and Effects to Biota

• Working Group 6 - Biosphere Modelling for Long Term Safety Assessments of High Level Waste Disposal Facilities

• Working Group 7 - Assessment of Fate and Transport of Radionuclides Released in the Marine Environment

MODARIA II WG1 will further strengthen the linkage between mathematical modelling and decision-aiding tools .

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MODARIA II Working Group 1Member State Participation

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CountryNumber of

Participants'Argentina 1

Australia 3

Azerbaijan 1

Belarus 1

Belgium 5

Brazil 1

Bulgaria 2

Canada 5

China 5

Denmark 1

Egypt 1

Finland 1

France 4

IAEA 1

Indonesia 2

Italy 1

Lithuania 1

Morocco 1

Netherlands 1

Russian Federation 1

Singapore 1

Slovenia 2

South Africa 3

Spain 2

Sweden 1

Switzerland 1

Thailand 1

Ukraine 1

United Kingdom 17

United States 8

Vietnam 1

Grand Total 77

Argentina , 1, 1% Australia , 3, 4% Azerbaijan , 1, 1%

Belarus , 1, 1%

Belgium , 5, 6%

Brazil , 1, 1%

Bulgaria , 2, 3%

Canada , 5, 6%

China , 5, 6%

Denmark , 1, 1%

Egypt , 1, 1%

Finland , 1, 1%

France , 4, 5%

IAEA , 1, 1%

Indonesia , 2, 3%

Italy , 1, 1%

Lithuania , 1, 1%

Morocco , 1, 1%Netherlands , 1, 1%Russian Federation , 1, 1%Singapore , 1, 1%

Slovenia , 2, 3%

South Africa , 3, 4%

Spain , 2, 3%

Sweden , 1, 1%

Switzerland , 1, 1%

Thailand , 1, 1%

Ukraine , 1, 1%

United Kingdom , 17, 22%

United States , 8, 10%

Vietnam , 1, 1%

77 MEMBERS FROM 31 MEMBER STATES & IAEA

MODARIA II WG1 was established in late October 2016.

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Work Scope:

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WG 1: Assessment and Decision Making of Existing Exposure Situations for NORM and Nuclear Legacy Sites

– WG Leader: Ming Zhu (USA)

– IAEA Scientific Secretary : Tamara Yankovich

– Methods and tools for radiological impact assessments and application to specific situations

– Methodologies for decision analyses for remediation and closureof NORM and legacy sites

– Communication and engagement with relevant interested parties

– Training for end users for the use of the relevant software

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History and Focus of MODARIA II WG1:

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MODARIA II WG1 is a combination of 2 MODARIA I Working Groups:

– one focused on application of decision-aiding tools in remediation; and

– another focused on risk assessment for NORM and radioactively contaminated legacy sites.

MODARIA II WG1 is focused on:

– Developing methodologies and toolsets for risk-informed decision-making for NORM and nuclear legacy sites, including:

– Demonstration of decision-making processes and tools through case studies.

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Work Scope Illustration:

Assessment and Decision Making for Existing Exposure Scenarios of NORM and Legacy Waste Sites

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• Environmental Remediation

• In-Situ D&D/Site Closure

• Risk Assessment

• Decision Analysis

Hanford Site Excavation of Cr-contaminated Soil

Site characterization Remedy selection Remedial action Post-remediation mgt.

Hanford Site environmental remediation, in-situ D&D, and tank waste management

Typical NORM site remediation

Savannah River Site H Tank Farm

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• Develop improved methodologies for radiological impact assessments

• Improve assessment models

• Conduct model–model and model–datacomparisons

• Apply methodologies to existing sites and facilities

• Train end-users (regulators, operators, other stakeholders) on the use of NORMALYSA, RESRAD, and other codes

Risk Assessment Tasks:

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Decision Analyses Tasks:

• Document decision-making processes for best practices and lessons learned

• Develop lists of “prevailing circumstances” and site-specific situations

• Develop methodologies and toolsets for formalizeddecision analysis

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Recent Activities and Accomplishments:

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– First Technical Meeting of MODARIA II, Vienna, Austria, 31 October-4 November 2016.

– WG1 First Interim Meeting, Brussels, Belgium, June 26-30, 2017, including field trip to the Tessenderlo Chemie (TCH) phosphate processing Site.

– 2 sites were selected for Case Studies; An additional site will be evaluated in late 2017

– 2 additional sites were selected as examples for sharing good practices and lessons learned

– A Work Plan has been developed for 2017-2019

– An Interim Report is being prepared

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MODARIA II WG1 Activities

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Sites Selected for Case Studies:

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Tessenderlo (TCH) Phosphate Processing Site

Belgium

Pridneprovsky Uranium Legacy Site

Ukraine

Fig.1.2. Scheme of industrial site of the PChP with main radioactively contaminated sites

and facilities.

4 4

C

A

A

D

B

B

E

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Tessenderlo (TCH) Phosphate

Processing Site, Belgium

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Site locations: The facilities (orange); sludge basin (dark blue); waste water buffer basin (light blue); landfill (green); out of operation (dashed); discharge points to the rivers (yellow)

Sludge pond at the Kepkensberg site

Ra-226 contamination in the Winterbeek River

TCH Phosphate Processing Facility

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Pridneprovsky Uranium Legacy Site, Ukraine

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Location of Zapadnoe tailings

Distribution of Rn-222 flux (mBq/m2/s) from the surface of Zapadnoe tailings in September 2009

Fig.1.2. Scheme of industrial site of the PChP with main radioactively contaminated sites

and facilities.

4 4

C

A

A

D

B

B

E

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Sites Selected as Examples for Good Practicesand Lessons Learned

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Material Disposal Area B

Los Alamos National Laboratory

USA

Beaverlodge Mine/Mill Site

Canada

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Material Disposal Area B - Los Alamos National Laboratory, USA

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Site layout

Distribution of Pu concentrations from samples

A clean-up area at LANL MDA B

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Beaverlodge Mine/Mill Site Closure

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Beaverlodge Mine/Mill in 1983

2012 Remediation Options Workshop

Modeling Non-Human Biota

Assess

Information

1

Assess

Risk

2

Assess

Options

3

Implement

& Monitor

Options

4

Apply forRelease

5A B C D E

Management Framework

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MODARIA II WG1 Work Plan:

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– A Work Plan has been developed, including:Literature review, data analysis, model-model/data

comparisons, and documentation activities for 2017-2019

Demonstration of use of Guided Interactive Statistical Decision Tools (GiSdT) for stakeholder-engaged structured decision-making at the MODARIA II 2nd Technical Meeting, October 30-November 3, 2017

Presentations at international conferences (e.g., NRPA International Workshop; WM2018)

Preparation of an Interim Report due to IAEA by October 2018; Final Report due October 2019.

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Collaborations/Leveraging:

• Within MODARIA II:➢WG 5: Joint session in June 2017; biota modeling➢WG 3: Human-biota modeling➢WG 2: Urban scenarios; joint meeting at 2nd TM➢WG 6: FEPs list

• Within the IAEA:➢RICOMET, CIDER, ENVIRONET➢ ICRP Task Groups 98 and 105

• External:➢P&RA CoP➢ ICEMM➢ASCEM➢ERAD

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Positive Feedback Loops and Leveraging:

Member States

Needs for Tools,

Parameter Values,

Capacity-building

VAMPBIOMOVSBIOMASSEMRASEMRAS IIMODARIAMODARIA IIetc.

• Knowledge sharing

• Linkages with other networks

• New ideas• Gap filling• New knowledge

and new tools

Tool Development and Testing OutcomesNeeds

Positive Feedback

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Positive Feedback Loops and Leveraging:

• Knowledge sharing

• Linkages with other networks

• New ideas• Gap filling• New knowledge

and new tools

Outcomes from ToolTesting and Development

Positive Feedback

Development ofSafety Guidance

NORMALYSA,RESRAD, etc.

Developmentof NewMethodologies and Tools, andImprovement of Existing Tools

Application ofGuidance to Develop New Tools

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Further information on MODARIA II WG1 and other IAEA International Model Validation Programmes:

https://gnssn.iaea.org/sites/auth/rtws/modaria/Shared%20Documents/MODARIA%20II%20WG1%20-%20Secure%20File%20Folder/2%20-%201045am%20Ming%20Intro.pdf

WG1

IAEA

Thank You!t.yankovich@iaea.org

Ming.Zhu@em.doe.gov