1 CHAPTER 9 MATERIAL MANAGEMENT Demeulemeester Yves BR3 Dismantling project SCKCEN

2 Work Organization Dismantling Cutting Temporary storage Sorting TreatmentCharacterizationEvacuation Identification

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 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 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 Working methodology followed during the actual dismantling

7 REMOVAL ROUTES BR3

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

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 DISMANTLING methodology – BR3

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

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

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

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

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

29 Example: High activated internals

30 Example: High activated internals

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

32 Example : Asbestos

33 Example : Asbestos

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

36 Example: Turbine shaft

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

38 Example: Encapsulated lead

39 Example: Encapsulated lead

40 Video Example: Encapsulated lead

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 Evacuation of Radwaste

43 Evacuation of Free released materials

44 Evacuation to Melting Facility

45 UPDATING DATABASE UPDATING INVENTORY’S RECORDS AFTER EVACUATION

46 DATABASE