Cutting & dismantling techniques JRC – 6th International...
Transcript of Cutting & dismantling techniques JRC – 6th International...
Cutting & dismantling techniques JRC – 6th International Summer School
11 September 2014
Bernard Rottner
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Foreword
• Cutting in situ
• For dismantling
• Cutting in a workshop
• Or in a glove box or in a cell
• For segmentation and waste management
• Hot technologies
• Plasma, laser, flame cutting, thermal lance
• Quick
• No recoil force ⇒ easy to operate remotely (generally)
• But dispersion of radionuclides
• Cold technologies
• Mechanical: alternative saw, band saw, diamond cable,
shear…
• Disk saw, grinder: hot technologies?
• High pressure water
• Exotic technologies, for instance with explosives
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Optimization of the cutting time
• Cutting a furnace inside a glove box in la Hague
• Alpha environment
• Not enough space
• Furnace with thick parts
Reciprocating saw: 70 h
Orbital machining: 8 h
Band saw: 1.5 h
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Reciprocating saw
• And sabre saw
• Advantages
• No hot point
• Able to cut large pieces
• Short installation time (and
then sawing without hands
on works)
• Drawback
• Slow
• Risk of braking blades
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Orbital machining
• Advantages
• No hot point
• Able to cut large pieces
• Short installation time (and
then sawing without hands
on works)
• Drawback
• Slow
Mock-up of an annular tank of UDG
(enrichment plant), with the
cutting tool under testCutting a SG into 2 parts
Dampierre , April 1990
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Dismantling of Chinon A3 heat exchangers
• Reciprocating saw
• Rotating saw
• Orbital machining
• Plasma
• 4500 tons of metal
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Nibbler
• Advantages
• No hot point
• Able to cut large pieces
• Quick
• Drawbacks
• Full hands on work
• Thin sheets (< 1mm)
• Starting hole (on closed
tanks)
Dismantling of LHA (hot cells) - CEA site of Saclay
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Other mechanical cutting technologies
• Hydraulic shear
• No hot point
• Quick
• Closes the pipes when cutting
them
• Diamond cable
• Able to cut very very large
pieces
• Cuts steel and concrete
• Usually with cooling water,
could be used without
• Difficulties with lead, and
multilayer pieces
• Chain saw
• For lead
• Core cutter
• For concrete slabs
• Holes one after another, all
around the part to cut
Dismantling of TU2 tanks, AREVA
site in Pierrelatte
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Plasma cutting
• Advantages
• Quick
• Easy to handle
• Could be used underwater
• Drawbacks
• Hot (dispersion)
• Not easy to operate remotely
• Limited thickness (about 50mm, depending on
the power of the torch)
Dismantling of Chooz A gallery to the grass
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Other cutting technologies
• Laser
• Thickness up to 100mm
• Low emission of airborne particles
• High pressure water jetting
• 3000 to 5000 bars
• With abrasive
• For steel and concrete
• Hydraulic splitters
• For concrete
• Bore holes, put a splitter in each
• The concrete slab breaks
• Expansive cement can be use instead of
hydraulic splitter
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The most popular dismantling technology
• Rock climbing!
• Very sloppy gallery in Chooz A
(underground power reactor)
• From the reactor cave to the grass
• We dismantled the gallery in 2006
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Dismantling of the technical gallery 001
• Remote operation
• Brokk (vehicle) with different tools
• Disk saw
• Vacuum cleaner with rotating brushes
• High pressure water jetting tool with camera
and lightning
• Gripper
• Waste bucket
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Dismantling of the DMC
• Remote operation
• Hydraulic manipulator (HIAB), with:
• A specific wrist
• A bucket
• Hydraulic drill
• Cutting rail
• 600kg at 10m
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Large dismantlings
• Conventional excavator, modified for operating in a nuclear environment
• Electric powering (no emission of toxic gases)
• Remote operation
• Used at CEA Grenoble and at SICN Veurey
Plastic containment covering the building
under dismantling
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Dismantling of the Vibratechnic
• Between remote and hands on operation
Sas en dur Sas vinyle
Pot blindéégoutures
T H P
CameraTete de lançage
Platelageblindé
Récupération effluents et déchets
Principe dedécontamination des vis
Poste decontrôle
commandeexterieur
Poste de contrôle interne
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Dismantling of the dissolvers
• Main features of the work:
• Duration : 6,5 years (2011 – 2018)
• 15,000 h engineering, including safety cases
• 11t of primary waste
• 60t of secondary waste
• Maestro manipulator:
• Develloped by CEA and Cybernetix
• Hydraulic
• Master and slave manipulators
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3D modelling
• Check that the design fits the installation (room is sufficient, movements are possible)
• Good support for dialog with the client and with the authorities
• Simulation of the lightening
• Training
• Evaluation and optimization of the productivity.
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DFD: decontamination for dismantling
• EPRI patent
• Bradtec (now Onet Technologies subsidiary) designed the
process on behalf of EPRI
• OT has a licence
• Full system decontamination
• Bradtec participated to Main Yankee, Big Rock Point and
Zorita
• OT is preparing Bohunice (Slovakia), for FSD in 2014
• Dose saving: connect the system to the primary (main)
loops, and then the chemistry transfers the activity from
the circuits to ion exchange resins, without hands on
work.
• In bath decontamination
• Free release of metallic scraps
• System available in UK
• Waste optimization
• Small amount of resins
• May be regenerated : the waste is a liquid concentrate
• The concentrate may be solidified for final disposal.
Pump skid
Resins skids
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Concrete decontamination
• Mechanical scabbling: ATUE
(CEA/Cadarache, 30,000m2)
• Hammer (thick layers)
• Rotating shaver (thin layers)
• Shot blasting (thin layers)
• High pressure water jetting:
FBFC Pierrelatte, 5000m2
• From 100 to 2500 bars
• Laser
• 10m2/h, 1cm
Water jetting
Floor scabbling or shaving