1 DISMANTLING TECHNIQUES STATE OF THE ART ON DEVELOPMENT OF TECHNOLOGIES FOR DISMANTLING OF NUCLEAR INSTALLATIONS IN RUSSIA

2 Outline Techniques Remote use of techniques for dismantling

3 Plasma Arc Torch High cutting speed Low driving force Can be used in air and water Production of aerosols Large quantity of secondary waste

4 Electro-erosion fragmentation

5 Very precise Adequate for “chirurgical operations” Slow Production of aerosols

6 Gas Jet cutting easily rigged by manipulation devices high production runs High quantities of secondary waste Fig. source: TMI

7 Source: PRC Laser Laser cutting Principle

8 Laser cutting Limited cutting thickness Energy consuming In the test phase

9 Explosive cutting Ref: Explosive cutting: Shape charges are used to cut through thick steel plates and cylinders

10 Explosive cutting

11 Choice of a dismantling technique To 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 ….

12 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; 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:

13 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