CHAPTER 9 MATERIAL MANAGEMENT

1. CHAPTER 9MATERIAL MANAGEMENT Demeulemeester Yves BR3 Dismantling project SCK•CEN

2. Work Organization Dismantling Cutting Sorting Identification Temporary storage Treatment Characterization Evacuation

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

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

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

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

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

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

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

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

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

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 • 118.3 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) • 286 200-l drums • 13.2 tons

32. Example : Asbestos

33. Example : Asbestos

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. Example: Encapsulated lead • Video

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

46. DATABASE