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Date: 13

Introduction to Magnox North Interim Storage Philosophy R

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Date: 13

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    1. Date: 13/06/2007 1

    2. Introduction to Magnox North Interim Storage Philosophy R&D Opportunities reduce risks from storage remove hazards associated with storage baseline busting Objectives

    3. Magnox North Limited Geographical Lifecycle generate plan decommission Who we are and what we do

    4. “Care and Maintenance” Preps HNA: ~3200 m3 CPX: ~500 m3 (‘special wastes’) WYL: ~35 m3 TRA: ~1200 m3 OLD: ~750 m3 Waste Volumes (ILW)

    5. Fuel Element Debris IX media Sludges Desiccants Miscellaneous solids (“MAC” and “MCI”) Wastes types (ILW)

    6. typically - 9:1 BFS:OPC capping grout - PFA:OPC some polymer (eg Traws) Container types - typically: 3m3 Boxes and Drums fabricated from 316L Wasteforms:

    7. Site Stores - Trawsfynydd

    8. Trawsfynydd: Natural ventilation – no HEPA filters or environmental controls Monitored Concrete ‘overpacks’ for (3m3 containers) and stillages Easy assess Hunterston A: HEPA filters and environmental controls Monitored Store walls provide shielding Provision for overpacks Site Stores: two built

    9. Oldbury Will use lessons learned from elsewhere, apply best practice, consistency with disposal concept Chapelcross Concept stage – recondition existing building ? Traws-like overpack (limited need for store)? Wylfa - (limited need for store) Site stores for the future?

    10. Interim Store Challenges (Magnox)

    11. Philosophy – multi-pronged Package monitoring and inspection

    12. Magnox Generic R&D Programme Container Monitoring - Establishing baseline

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    16. Core Projects* : Benefits Demonstrate: long-term waste package stability (simulants), 20 years of data sustainability of cement-based packages regulatory and stakeholder compliance Supports LoC submissions Reduced risk reworking during storage Looking to broaden / integrate with other SLCs

    17. What could Magnox do if a 3m3 box failed during storage? Concept overpack and retrieval system developed 2007/08 Container ‘Reworking’

    18. Guidance for Magnox Packages “ACOP” 2004 Whole life-cycle… manufacture to storage NNL carried out technical review 2006/07 Update progressing* 2008/09 (UKAEA TSG) industry developments (NWRF etc) generic R&D findings 500 year container lifetime new materials (duplex etc) Care & Management Packages

    19. Risk Management - Prioritisation

    20. Reducing Risks, Removing Hazards Examples of reducing risk of package failure Examples of hazard removal Something completely different

    21. Optimisation – Duplex Containers Sellafield paper recommended duplex Advantages: superior localised corrosion protection Concerns: formability / fabrication Core projects: four duplex containers added to study … don’t hold breath about uptake at MxN

    22. Optimisation - Superplasticisers

    23. Optimisation – better wasteforms

    24. Opportunities – remove reactivity In principle, seems ‘right thing to do’ Dungeness A dissolve FED (carbonic acid) MxS - DSO – looking to improve / roll out MxN ‘bought into process’ Significant reduction in reactive metal volumes (100s m3)

    25. Opportunities – remove tritium Tritium-rich waste streams (CPX, desiccants) MxS - DSO – looking to ‘treat’ at High T MxN ‘bought into process’ 10s m3 reduction possible Also improved characterisation (reclassify and/or ‘decay store’)

    26. Alternative approach – “Yellow Boxes”

    27. Date: 13/06/2007 27 Conclusions Magnox North Sites – two stores exist (different concepts), others planned Multi-pronged approach to demonstrate robustness, including: building on the work of others – applying to Magnox North setting wealth of own R&D work (thanks especially to Roger and Supply Chain) to underpin interim storage and package assurance Opportunities – to do better (longevity enhanced, cheaper) or change the concept altogether

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