IAEAInternational Atomic Energy Agency
WG1: Assessment and Decision Making for NORM and Nuclear Legacy Sites
Ming Zhu, Ph.D., PE, PMPU.S. Department of Energy, Office of Environmental Management
Presented to MODARIA II Second Technical MeetingOctober 30, 2017
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MODARIA II WG1Member State Participation (as of May 2017)
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CountryNumber of Participants'
Argentina 1Australia 3Azerbaijan 1Belarus 1Belgium 5Brazil 1Bulgaria 2Canada 5China 5Denmark 1Egypt 1Finland 1France 4IAEA 1Indonesia 2Italy 1Lithuania 1Morocco 1Netherlands 1Russian Federation 1Singapore 1Slovenia 2South Africa 3Spain 2Sweden 1Switzerland 1Thailand 1Ukraine 1United Kingdom 17United States 8Vietnam 1
Grand Total 77
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MODARIA II WG1
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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
– IAEA Scientific Secretary : Tamara Yankovich– WG Leader: Ming Zhu (USA)– Methods and tools for radiological impact assessments and
application to specific situations– Methodologies for decision analyses for remediation and closure
of 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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• Risk Assessment• Decision Analysis
Hanford Site Excavation of Cr-contaminated Soil
Site characterization Remedy selection Remedial action Post-remediation mgt.
Abandoned Uranium Mine and Mill Tailings
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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Main 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; Additional sites will be considered for addition to case studies at this meeting
– 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 planned for 2018
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Sites Selected for Case Studies
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Tessenderlo (TCH) Phosphate Processing Site
Belgium
Pridneprovsky Uranium Legacy Site
Ukraine
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
C
A
A
D
B
B
E
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U Mining and NORM Legacy Sites, Brazil
Eduardo Figeria da Silva Plenary PresentationWednesday morning
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Mining and Mill Tailings Site, Yunnan, China
Coal mining and surrounding farmland
Tailing and paddy field
Hongtu Sun presentation to WG1, Monday afternoon
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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
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 2017‐2019Demonstration of use of Guided Interactive Statistical Decision
Tools (GiSdT) for stakeholder‐engaged structured decision‐makingat this Meeting, on Thursday, 3 Nov. 2017
Presentations at international conferences (e.g., NRPA International Workshop, Nov. 2017; P&RA CoP 2017 Annual Technical Exchange Meeting, Oct. 2017; WM2018, March 2018)
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: Joint WG1/3/5 session at this meeting WG 2: Urban scenarios; joint meeting held at TM1 WG 6: FEPs list
• Within IAEA: RICOMET, CIDER, ENVIRONET: Discussion in July 2017 ICRP Task Groups 98 and 105: WG1 presentations at this meeting
• Other Programs: P&RA CoP: 2015 and 2017 Annual
Technical Exchange Meetings ERAD: August 2017 Webinar ICEMM ASCEM
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WG1 Activities at TM2
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Plenary presentation by Eduardo Figeira da Silva (Brazil) on Uranium mining and legacy waste sites in Brazil; potential addition to the case studies
WG1 presentation by Hongtu Sun (China) on site in Yunan, China; potential addition to the case studies
Joint Session with WG3 and WG5 to discuss biota modelingfor Case Studies
Demonstration by Paul and Kelly Black (USA) of use of Guided Interactive Statistical Decision Tools (GiSdT) for stakeholder‐engaged structured decision‐making at this Meeting, on Thursday, 3 Nov. 2017