1 DISMANTLING TECHNIQUES STATE OF THE ART ON DEVELOPMENT OF TECHNOLOGIES FOR DISMANTLING OF NUCLEAR...
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Transcript of 1 DISMANTLING TECHNIQUES STATE OF THE ART ON DEVELOPMENT OF TECHNOLOGIES FOR DISMANTLING OF NUCLEAR...
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DISMANTLING TECHNIQUES
STATE OF THE ART ON DEVELOPMENT OF TECHNOLOGIES FOR DISMANTLING
OF NUCLEAR INSTALLATIONS IN RUSSIA
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Outline
• Techniques• Remote use of techniques for dismantling
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Plasma Arc Torch
• High cutting speed• Low driving force• Can be used in air and water
• Production of aerosols• Large quantity of secondary waste
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Electro-erosion fragmentation
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Electro-erosion fragmentation
• Very precise• Adequate for “chirurgical operations”
• Slow• Production of aerosols
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Gas Jet cutting
• easily rigged by manipulation devices • high production runs
• High quantities of secondary wasteFig. source: TMI
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Source: PRC Laser
Laser cuttingPrinciple
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Laser cutting
• Limited cutting thickness• Energy consuming• In the test phase
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Explosive cutting
Ref: http://www.pml.tno.nl/en/em/ap_cutting.html
Explosive cutting: Shape charges are used to cut through thick steel plates and cylinders
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Explosive cutting
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Choice of a dismantling techniqueTo be considered
• maturity of the technique• environment• complexity, thickness, etc.. Of material to
be dismantled• amount of generated secondary waste • cutting duration• operator's dose uptake • easiness of the operation• ….
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The remote-controlled complexes (RCC) for dismantling of nuclear
reactors of channel type
1 - Bearing truss; 2 - Skewing platform; 3 - Crosspiece; 4 - Hoist; 5 - Water seal; 6,12 - Safety compartments; 7 - Repair box; 8 - Handling box; 9-11 - Radiation-safety plates; 13 - Facility for sealing and decontaminating the primary packing of radioactive waste; 14 - Auxiliary safety container; 15 - Platform turning mechanism; 16 - Crosspiece lifting mechanism; 17 - Light-duty (tool) manipulator; 18 - Heavy-duty (load) manipulator
The general construction of the remote-control system for dismantling of reactor of the first power unit at the Beloyarsk NPP:
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Remote-controlled complexes for dismantling of nuclear reactors of vessel type
The dismantling system for mechanical cutting of the vessel of VVER-440 reactor:
1 - Supporting structure; 2 - Pull-rod; 3 - Tip; 4 - Ports; 5 - Platform; 6 - Turning gear; 7 - Rotary
table; 8 - Radial slots of rotary table; 9 - Rotary tool heads; 10 - Cutting tool; 11 - Grip; 12 - Hoist; 13 - Manipulator; 14 - Tool box; 15 - Handling facility; 16 - Platform hoisting mechanism; 17- Safety shell;
18 - Centering device