international atomic energy agency disposal facility & engineered barrier system (ebs) design...
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International Atomic Energy Agency
Disposal Facility & Disposal Facility & Engineered Barrier System (EBS) Engineered Barrier System (EBS)
Design Design
PRISM: PRISM: Practical Illustration and use Practical Illustration and use of the Safety Case Concept in the Management of of the Safety Case Concept in the Management of
Near-surface DisposalNear-surface Disposal
David Bennett2 April 2009
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International Atomic Energy Agency
Design Working Group
• David Bennett [email protected]• Nadja Zeleznik [email protected]• Bernhard Großmnn [email protected]• Gyula Dankó [email protected]• Sandi Virsek [email protected]• Michael Tichauer [email protected]• Peter Salzer [email protected]• Janez Perko [email protected]• Dody Ivan [email protected]• Marija Kališnik [email protected]• Stasys Motiejunas [email protected]
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International Atomic Energy Agency
Working Group Objective
• To share information and communicate good practice on:
• How decisions on the design, extension and improvement of near-surface waste disposal facilities can be informed by, and justified using the Safety Case
• How the Safety Case can be used on an ongoing basis to support management decisions on facility design and modification
• We will also acknowledge the role of the EIA process in the early stages of facility design and implementation
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International Atomic Energy Agency
Proposed Work AreasProposed Work Areas
1) Designing and upgrading near-surface radioactive waste disposal facilities using the safety case:1a) Review of past and current practice on design
• Will take examples from near-surface facilities in the WG’s experience
• Will also seek information to cover a wider range of facilities and waste types
• Will actively seek assistance from other project participants and relevant organisations
• Have developed some terms of reference for this ‘data gathering’
• Will also review relevant IAEA and NEA documents
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International Atomic Energy Agency
Proposed Work AreasProposed Work Areas
1b) Analysis of review findings to identify lessons on good practice in facility design
• Have begun to identify and consider the many factors that affect facility design
• Will describe expectations of facility design information at different stages of facility development
• Will describe relationships between facility and EBS design and the safety case at different stages
• Will discuss optimisation of EBS (ALARA)
• e.g., iterative schemes
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International Atomic Energy Agency
Terms of Reference for Data Gathering
• Safety / design philosophy • Both for operations and post-closure
• General description of facility development history, e.g:• Waste type and inventory
• Influence of regulations/guidance
• Commentary on reasons for the design of each engineered component (e.g., package, backfill, walls, cap, drains etc)• e.g., size, shape, material, monitoring
• History of any design changes and their rationale
• Functions assigned to engineered components (if any)
• Treatment of barriers and barrier degradation in the safety case / assessment
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International Atomic Energy Agency
Facilities Covered by Working Group
• Dessel, Belgium
• CSM, CSA, Morvilliers, France
• Konrad, Germany
• Püspökszilágy & Pecs, Hungary
• Maišiagala & new prototype near-surface repository, Lithuania
• Mochovce, Slovakia
• Slovenian silo concept
• LLWR, UK
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International Atomic Energy Agency
Broadening Our Scope
• Borehole facilities• Previous IAEA projects • South Africa, Russia, US
• Mine tailings • Previous IAEA projects • Wismut?
• Forsmark, Olkiluoto type facilities• Swedish/Finnish input
• Cavern type facilities• Richard – Czech Republic?
• ‘Deeper’ concepts for LLW/ILW? • France, Canada?
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International Atomic Energy Agency
Requirements & Constraints on Design• Safety requirements (e.g., dose constraint, ALARA)• Design philosophy (passive safety, isolation, containment….)• Waste type / characteristics• Stakeholders (public, local communities, scientific community and committees,
others)• Past practice / experience• Operational factors (e.g., infrastructure, waste handling, waste QA checking)• Site characteristics • Monitoring• Knowledge of any pre-existing facilities on the site (disposal and other)• Safety assessors, facility operators• Availability of barrier materials & technology• Barrier performance/degradation• Safety assessment assumptions and results, existing WAC• Project timescales and feasibility• Allowing for flexibility and iterations of the safety case• Costs vs benefits (of alternatives)• Regulations• Government & Policy
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International Atomic Energy Agency
Design in the Facility Lifecycle
• Stages (will vary by country and site)
• Site screening, investigation, characterisation, selection
• Design options and concept selection
• Detailed design
• Construction
• Operational phase• Refinement of design
• Upgrading if necessary
• Closure
• Institutional Control
• Plan to discuss the design and related safety case activities for each stage
• Will consider a range of facility types
• Will consider the relative importance of various factors & influences on design at each stage
• Will work closely with Group 1 on timeline
overlap, iteration, variation in stages
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International Atomic Energy Agency
Planning
• Roles and responsibilities of group members defined and agreed
• Provisional schedule outlined
• Deliverables identified
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International Atomic Energy Agency
Provisional Schedule
• Terms of reference for data gathering (drafted Apr 2009)
• Data gathering (by Oct 2009)
• Working group meeting to discuss findings and begin drafting report (Nov-Dec 2009)
• Improve report draft of report (Spring 2010)
• Presentations to next plenary in Spring 2010
• Workshop style day
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International Atomic Energy Agency
Main Deliverables
• Terms of reference for data gathering
• Notes on relevance to the group’s work of existing IAEA and NEA documents
• Papers on various disposal facilities
• Table of contents for report
• 2 part structure as described above
• Detail to be developed
• 1st Draft of report
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International Atomic Energy Agency
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International Atomic Energy Agency
Issues List
• Project website
• Project newsletter
• Draft IAEA safety guides
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International Atomic Energy Agency
Interfaces with other WGs
• Generic WAC
• Design changes to manage uncertainties
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International Atomic Energy Agency
Roles & Responsibilities
• Review of ISAM, ASAM documents and other IAEA documents on engineered barriers, facility closure and design
• Put relevant documents on website (all)
• TR433, upgrading of NS repositories, SR35,surveillance and monitoring of NS repositories, ASAM cross-cutting report on engineered barriers
• Be aware of draft safety guides (DS334, 354, 355, 357) (SM / all)
• Close cooperation with Group 1 at early stage (DB)
• Data gathering on our facilities (all)
• Send results to DB by 30 September, copy to others in group
• Everyone to read before group meeting
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International Atomic Energy Agency
Roles & Responsibilities
• Arrange next group meeting (DB, DI?)• IAEA funding support (DB,JR)
• 2 or 3 days to discuss findings and lessons
• Prepare 1st draft of report (DB, GD, JP, PS)• Begin drafting at the meeting and continue after
• Rest of group will review
• Presentations to next plenary (all data gatherers, authors)
• Ongoing communication with other groups via plenarys and Coordinating Committee