Objectif Because of the structural conditions and in terms of radiation protection a great number of cutting activities for the dismantling of nuclear installations are performed under water, either in situ (e.g. in LWR) or in specially designed basins. This strategy is especially true for highly activated RPVs and their internals. For the dismantling of these thick-walled and partly complex structured components cutting techniques and handling devices have to be developed and qualified, which are easy to handle, reliable, and flexible in their field of application. Contact Arc Metal Cutting (CAMC) is thermal sputtering of metallic, i.e. electrically conductive materials by means of a discontinuous high power short circuit arc ignited by contact between the non-consuming electrode and the workpiece. Principally, the sectile material thickness depends on the geometry of the electrode. First tests showed promising 3 results in terms of applying this technique to material thicknesses beyond 300 mm. Above an effective wall thickness of the workpiece of 30 mm the cutting speed of CAMC.is in their same range as compared to plasma arc cutting. Complex geometries may be segmented with a simple, linear movement of the electrode, the shape of which depends on the cutting task, thus being a sward, a disk, or a rod with various cross secti In principle, reacting forces do not occur. In order to reduce the electrode wear, there is a need for investigations on different electrode materials, on the optimization of the electrode cooling, the scavenging, and, the process control. - Although no process gases are applied in CAMC, there appears to be a production of gaseous effluents, their amount being a function of the waterdepth. As it is true for all thermal cutting techniques, also CAMC produces aerosols, hydrosols and sedimented dross. Detailed investigations and measurements of waste products shall be one major point of this project when cutting different materials in comparison, i.e. aluminum, stainless steel, and mild steel with a stainless steel plating. The light-weight CAMC-tool shall be guided by means of a remote operated modular Manipulator Handling System (MHS) of Voest-Alpine/MCE, which is carried by a three axes handling device, of which CIEMAT and the Institut fuer Werkstoffkunde/University of Hanover have a similar system in their facility, each. Apart from adapting the MHS to the given underwater task, which includes the interfaces to the CAMC-tool and the handling device, a system for the control and monitoring of the complete performance will be applied, including sensors and underwater cameras. Both, the CAMC-tool and the manipulator shall be qualified in cold tests on representative mock-ups of the components to be dismantled. Cutting of activated material shall be performed in the facility of the JEN-1 experimental reactor of CIEMAT after these trials. The application of the MHS in JEN-1 within the time scale of this proposed project depends on the legal situation, though. Because of this, the CAMC-tool will be designed as such, that it can also be connected to the handling device of CIEMAT directly. The results of the measurements of waste products in this phase shall be compared to those gathered during cold testing. Programme(s) EAEC-NFS 2 - Specific research and training programme in the field of nuclear safety and safeguards, 1994-1998 Thème(s) 030401 - Development and innovative dismantling techniques Appel à propositions Data not available Régime de financement CSC - Cost-sharing contracts Coordinateur UNIVERSITAET HANNOVER Contribution de l’UE Aucune donnée Adresse Appelstrasse 11A 30167 HANNOVER Allemagne Voir sur la carte Coût total Aucune donnée Participants (2) Trier par ordre alphabétique Trier par contribution de l’UE Tout développer Tout réduire Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas Espagne Contribution de l’UE Aucune donnée Adresse 22,Avenida Complutense 28040 Madrid Voir sur la carte Coût total Aucune donnée Lentjes mce Anlagen - und Rohrleitungsbau Gmbh Autriche Contribution de l’UE Aucune donnée Adresse 78,Lunzerstrasse 4031 Linz Voir sur la carte Coût total Aucune donnée
