MO MODARIA I II: W WORKING NG G GROUP 6 6 BIOSPH PHERE M ERE - - PowerPoint PPT Presentation

MO MODARIA I II: W WORKING NG G GROUP 6 6

BIOSPH PHERE M ERE MODELLING F FOR L R LONG NG-TERM S RM SAFETY ASSE SSESSM SSMENTS O OF RADI DIOACT CTIVE VE W WASTE DI DISP SPOSAL L FACI CILI LITIES

IAEA r revie eview a and en enhancement o

• f Bi

Biomass m methodolo logy

What is the biosphere and how should it be handled to support construction of a repository?

Cartoon of the KBS-3 system at Forsmark, Sweden

IAEA Biosphere Modelling Methodological Documents

• BIOMASS-6. Reference Biospheres for Solid Radioactive Waste Disposal,

Report of BIOMASS Theme 1 of the BIOsphere Modelling and ASSessment Programme (2003)

• TECDOC 1799. Environmental Change in Post-Closure Safety Assessment
• f Solid Radioactive Waste Repositories. Report of WG3 EMRAS II (2016)
• Common Framework for Addressing Climate Change and Landscape

Development in Post-Closure Radiological Assessment of Solid Waste

• Disposal. Report of WG6 of MODARIA, submitted to IAEA

WORKING GROUP 6

BIOMASS Methodology enhancements

Assessment Context Biosphere system identification and justification Biosphere system descriptions Human actions, wildlife Potentially exposed group definition human/wildlife Biosphere and supporting model definition Conceptual model, mathematical model & data FEP list and screening Site under- standing Data and model selection principles

Climate development & downscaling Geosphere (discharge area) Near Surface investigation methods landscape development Principles for critical group selection Protection of the environment Confidence building

Calculation & communication

WORKING GROUP 6

WORKING GROUP 6

Developments i in biosphere m modelling s since ce B BIOMASS-6

• Experience from examples of practical application of BIOMASS-6 since 2001
• Experience of site characterisation at real sites
• Finland, Sweden, France, Spain, USA, UK, Canada … others…
• Science developments,
• Understanding of climate change and landscape evolution
• Ecosystem understanding and representation
• Methods in toxicology and multiple stressors
• Mathematical representation of processes
• Coherent link to the remainder of the safety assessment
• e.g. via transport of elements and site development
• Special models for special radionuclides, C-14, Cl-36 and Se-79
• Wider range of assessment endpoints:
• complementary indicators and
• those relevant to non-human biota
• Regulatory development and experience of assessment review

WORKING GROUP 6

Progress to date shows us that the task is to evaluate, update, clarify and as appropriate, extend the BIOMASS-6 methodology, and deliver a report that:

• Describes the biosphere assessment strategy and how it links to the overall

safety assessment so as to support transparent evaluation against protection

• bjectives
• Builds on the biosphere concept and describes the lessons learned since 2001,

including from the BIOPROTA program

• Describes supporting information/system description models needed for dose

modelling

• Extends consideration to a wider range of geographical environments
• Links landscape environmental change (MODARIA l) to dose modelling
• Assesses latest science that supports all the above, and
• Describes how site understanding functions as basis for model development

WORKING GROUP 6

• Evaluates discharge areas, and how

to define areas/volumes of interest corresponding to the protection

• bjectives
• Shows how to analyse and address

uncertainties and correlations

• Examines methods for presenting

and communicating results so as to enhance stakeholder confidence

• Provide real examples of the

application of the enhanced methodology General task… cont.

Hypothetical radionuclide flow path (Lindborg et al. 2010)

BIOMASS methodology outline

• Assessment context
• Guidance on critical and other exposure groups
• Guidance on application of data
• Biosphere system identification and justification
• Biosphere system principal components
• Biosphere system classification
• Application to specific examples
• Biosphere system description
• Procedure for biosphere system description
• Biosphere model development

Periglacial environment, West Greenland

WG6 Format

WORKING GROUP 6

Sub-activities

• Analogue environments
• Confidence and uncertainties
• Specific real sites as examples
• Potential Exposure Groups
• Environmentalchange and effects
• Climate and landscape development
• Safety assessment lessons learnt

Meetings and field studies

• Annual meeting Vienna
• Interim meetings
• BIOPROTA meetings
• Analogue environment studies

Report writing

• Defined writers and editors
• Input from participants
• Review of scientific findings and results

WORKING GROUP 6

Scope of activities includes:

• Deep geological disposal
• Near surface disposal
• All types of (solid) radioactive waste
• Wide range of geographical environments
• Taking account of on-going work in the

parallel BIOPROTA project on review and enhancement of the BIOMASS-6 methodology

• Legacy sites involving mixtures of

contaminated land, old disposal facilities and in-situ disposal

• Greater focus on the first few thousand

years

Landscape development data flow chart (Lindborg et al. 2010)

WG6 interim meeting 2017

Held at the Headquarters of Swiss Federal Nuclear Safety Inspectorate (ENSI), Brugg, Switzerland 10 – 12 May

• 28 participants from 10 IAEA Member States
• Presentations on ideas to enhance the BIOMASS methodology
• Defining report structure
• Identifying tasks to be done

This week:

• Presentations on international experiences

and scientific/technical developments.

• Presentations and discussions on tasks

identified within the WG.

• Interim report presentation and discussions
• Inputs from and integration of

BIOPROTA-programme

• Update work-plan with task allocation

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The biosphere, an integral part of the entire system

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