1. 1 CHAPTER 9 MATERIAL MANAGEMENT Demeulemeester Yves BR3 Dismantling project SCKCEN

2. 2 Work Organization Dismantling Cutting Temporary storage Sorting TreatmentCharacterizationEvacuation Identification

3. 3 Objective Traceability of material from production to removal From the point of view of external services  Asked by the regulatory authority  Information flow between the operator and the contractant (others services)

4. 4 Traceability From the point of view of the operator:  Improvement of decommissioning experience  Allow the right treatment process in function of type of material or component  Allow the right evacuation route in function of the history of the material  Allow the calculation of decommissioning cost

5. 5 Tools History of the plant Inventory of material (components, circuits and building) Database QA program related to material and waste management Specific tools (weighting pallet jack, drum scanner, sticker)

6. 6 Working methodology followed during the actual dismantling

7. 7 REMOVAL ROUTES BR3

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9. 9 DISMANTLING Using different techniques  Thermal cutting techniques  Mechanical cutting techniques  Hydraulic cutting techniques More details: Chapter 11

10. 10 DISMANTLING methodology – BR3 Contaminated pieces  Cut into large pieces on place  Further cutting into smaller pieces in ventilated cutting booth  Radiological reasons  Better place to use thermal techniques Activated pieces  Under water  PWR design

11. 11 DISMANTLING methodology – BR3

12. 12

13. 13 Creation of “batches” Batch : Group of materials that will follow the same removal route A batch can be:  300 l container  200 l drum  400 l drum  Single large piece e.g. a reservoir Every batch carries a unique label  unique number  content of the batch

14. 14 Description  Dismantling instruction  Inventory records  Loop, pieces of …  Dimensions - diameters  Type of material (stainless steel, carbon steel, painted …)  Origin (area, place in area…) Identification of a BATCH at BR3

15. 15 Batch types at BR3 200-l drum 300-l container Single piece

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17. 17 Storage Mostly not foreseen for the exploitation Need of extra buildings or storage places on site during decommissioning

18. 18 Examples External storage (BR3) Interim Storage North (Greifswald) Internal storage (BR3)

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20. 20 Treatment Mostly decontamination  Mechanical methods (e.g. sandblasting, scabbling)  Chemical methods See Chapter 10

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22. 22 Radiological Characterization Waste and melting  Easy detectable isotopes: γ-spectroscopy  Difficult detectable isotopes: isotope vector and radiochemical analysis. Unconditional clearance  Surface measurements (Bq/dm²)  “Mass” measurements (Bq/g) Techniques and equipments  See chapter 8

23. 23 Radiological Characterization Unconditional clearance methodology at BR3  Producer suggests the characterization methodology to be used  Health Physics and Authority approve it  Try to find standard methodologies

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25. 25 Classic “characterization” After nuclear clearance looking at the classical safety aspects of the material  Asbestos  Heavy metals (Pb, Hg, …)  Oils and greases  TL-tubes  … National (and or Regional) regulations

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27. 27 Example: High activated internals Dismantling: mechanical techniques (circular and band saw) under water Characterization  Sampling: swarfs  Radiochemical analysis → isotope vector Removal  Special racks  400-l drum

28. 28 Example: High activated internals 49 transports 118.3 tons of metal 14.7 TBq

29. 29 Example: High activated internals

30. 30 Example: High activated internals

31. 31 Example : Asbestos Specialized firm Unable to decontaminate Removed as radioactive waste (compressible waste) 286 200-l drums 13.2 tons

32. 32 Example : Asbestos

33. 33 Example : Asbestos

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35. 35 Example: Turbine shaft One piece removal Decontamination: CO2- blasting 1 measurement with ISOCS

36. 36 Example: Turbine shaft

37. 37 Example: Encapsulated lead Lead from a shielding wall During the melting taking of samples Radiochemical analysis Around 40 tons

38. 38 Example: Encapsulated lead

39. 39 Example: Encapsulated lead

40. 40 Video Example: Encapsulated lead

41. 41 Data acquisition The content of a batch, its status and its location must be known at each moment… All relevant information is on a label All this information is put into a database including the location of the batch Implementation of a Quality Assurance system

42. 42 Evacuation of Radwaste

43. 43 Evacuation of Free released materials

44. 44 Evacuation to Melting Facility

45. 45 UPDATING DATABASE UPDATING INVENTORY’S RECORDS AFTER EVACUATION

46. 46 DATABASE