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1
CHAPTER 9
MATERIAL MANAGEMENT
Demeulemeester Yves
BR3 Dismantling project
SCK•CEN
2
Work Organization
Dismantling Cutting
Temporary storage
Sorting
Treatment Characterization Evacuation
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
DISMANTLING
CUTTING, SORTING AND IDENTIFICATION
TEMPORARY STORAGE
TREATMENT
TEMPORARY STORAGE
CHARACTERIZATION (RADIOLOGICAL)
REMOVAL
RADIOLOGICALWASTE
UNCONDITIONALRELEASE
CONDITIONALRELEASE
CHARACTERIZATION (CLASSICAL)
DATAACQUISITION
7
REMOVAL ROUTES BR3
SORTING
MATERIALS
METALS
CONCRETE
ManualCleaning
AbrasiveZOE
ChemicalMEDOC
ShavingScabbling
CLEARANCE
RADIOACTIVEWASTE
ConcreteRecycling
Melting forClearance
Melting forRecycling
8
DISMANTLING
CUTTING, SORTING AND IDENTIFICATION
TEMPORARY STORAGE
TREATMENT
TEMPORARY STORAGE
CHARACTERIZATION (RADIOLOGICAL)
REMOVAL
RADIOLOGICALWASTE
UNCONDITIONALRELEASE
CONDITIONALRELEASE
CHARACTERIZATION (CLASSICAL)
DATAACQUISITION
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 boothRadiological reasonsBetter place to use thermal techniques
• Activated pieces Under water PWR design
11
DISMANTLING methodology – BR3
12
DISMANTLING
CUTTING, SORTING AND IDENTIFICATION
TEMPORARY STORAGE
TREATMENT
TEMPORARY STORAGE
CHARACTERIZATION (RADIOLOGICAL)
REMOVAL
RADIOLOGICALWASTE
UNCONDITIONALRELEASE
CONDITIONALRELEASE
CHARACTERIZATION (CLASSICAL)
DATAACQUISITION
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
16
DISMANTLING
CUTTING, SORTING AND IDENTIFICATION
TEMPORARY STORAGE
TREATMENT
TEMPORARY STORAGE
CHARACTERIZATION (RADIOLOGICAL)
REMOVAL
RADIOLOGICALWASTE
UNCONDITIONALRELEASE
CONDITIONALRELEASE
CHARACTERIZATION (CLASSICAL)
DATAACQUISITION
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)
19
DISMANTLING
CUTTING, SORTING AND IDENTIFICATION
TEMPORARY STORAGE
TREATMENT
TEMPORARY STORAGE
CHARACTERIZATION (RADIOLOGICAL)
REMOVAL
RADIOLOGICALWASTE
UNCONDITIONALRELEASE
CONDITIONALRELEASE
CHARACTERIZATION (CLASSICAL)
DATAACQUISITION
20
Treatment
• Mostly decontamination Mechanical methods (e.g. sandblasting,
scabbling) Chemical methods
• See Chapter 10
21
DISMANTLING
CUTTING, SORTING AND IDENTIFICATION
TEMPORARY STORAGE
TREATMENT
TEMPORARY STORAGE
CHARACTERIZATION (RADIOLOGICAL)
REMOVAL
RADIOLOGICALWASTE
UNCONDITIONALRELEASE
CONDITIONALRELEASE
CHARACTERIZATION (CLASSICAL)
DATAACQUISITION
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
24
DISMANTLING
CUTTING, SORTING AND IDENTIFICATION
TEMPORARY STORAGE
TREATMENT
TEMPORARY STORAGE
CHARACTERIZATION (RADIOLOGICAL)
REMOVAL
RADIOLOGICALWASTE
UNCONDITIONALRELEASE
CONDITIONALRELEASE
CHARACTERIZATION (CLASSICAL)
DATAACQUISITION
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
26
DISMANTLING
CUTTING, SORTING AND IDENTIFICATION
TEMPORARY STORAGE
TREATMENT
TEMPORARY STORAGE
CHARACTERIZATION (RADIOLOGICAL)
REMOVAL
RADIOLOGICALWASTE
UNCONDITIONALRELEASE
CONDITIONALRELEASE
CHARACTERIZATION (CLASSICAL)
DATAACQUISITION
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
34
DISMANTLING
CUTTING, SORTING AND IDENTIFICATION
TEMPORARY STORAGE
TREATMENT
TEMPORARY STORAGE
CHARACTERIZATION (RADIOLOGICAL)
REMOVAL
RADIOLOGICALWASTE
UNCONDITIONALRELEASE
CONDITIONALRELEASE
CHARACTERIZATION (CLASSICAL)
DATAACQUISITION
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
CHARACTERISATION OF THE RADIOACTIVE WASTE
MEASURING AND CHARACTERISATION
Complete SL-form
STORAGE BEFORE REMOVAL OF THE SITE
AGREEMENT DRAB
REMOVAL OF THE WASTE TO BELGOPROCESS
ArchivingSL-form
STORAGE
REMOVAL FROM THE SITE
Transfer data of inventory records
Yes
Mat. Mgm : NaI or NanospecSNM : Q² or SGS
Materials Management
Mat. Mgm
Mat. Mgm.
DRAB
Materials Management
43
Evacuation of Free released materials
TreatmentWithout
treatment
APPLICATION OF THE FREE RELEASE PROCEDURE
TREATMENT
MEASURING AND CHARACTERISATION
Setting up free release file
Completion of the free release file
TEMPORARILY STORAGE
APPROVAL HEAD OF HEALTH
PHYSICS
SORTING FOLLOWING CONVENTIAL NORMS
SORTING AGAIN .
No
Yes
REMOVAL OF THE MATERIAL FROM SITE
Transfer data of inventory records
Archiving free release file
FREE RELEASE
44
Evacuation to Melting Facility
Treatment
CHARACTERISTION
STORAGE BEFORE REMOVAL OF THE SITE
AGREEMENT OF Health Physics
and DRAB
REMOVAL OF THE MATERIAL FROM THE SITE
Transfer of the data of the inventory
records
Archiving melting file
PRELIMINARY DECONTAMI-
NATION
Yes
No
SMELTING FOR FREE RELEASE
SMELTING foR RECYCLing
NoSetting up of a melting file
Yes
Yes
Yes
Mat. Mgm : NaI or NanospecSNM : Q² or SGS
Mat. Mgm.
45
• UPDATING DATABASE
• UPDATING INVENTORY’S RECORDS
AFTER EVACUATION
46
DATABASE