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EVALUATION OF THE SEGMENTATION BY VARIOUS CUTTING TECHNIQUES (PLASMA TORCH, ARC SAW, CIRCULAR DISC, ETC.)

Objective

The project relates to industrial-scale testing in air of various relevant cutting tools. Its originality is a comparison between tools in the same normalized conditions of use.

The main purpose of this work is a comparison of different cutting techniques for the same working conditions in order to determine the real cutting time, to improve the knowledge of the cutting tools, and to evaluate the generated secondary wastes, cost aspects and the radiological impact.

The work requires an inactive testing cell, as well as appropriate materials and tools: the cell, located in an inactive testing station at CEA/Fontenay-aux-Roses, is an airtight room in which it is possible to work in a controlled atmosphere. Carbon and stainless steel plates with thicknesses of 10, 30 and 50 (or 60) mm with exactly known composition of the radioelements will be cut; the cutting tools which will be used are arc air, plasma torch, arc saw, circular disc and alternative saw.

Meetings will be arranged with partners after each tool test in order to improve their execution; therefore, the tests are carried out one after another. It is envisaged to cooperate in specific areas with the Universitaet Hannover and with the French industry.

The potential benefits of these tests are the protection and security of workers, a decrease of the volume of waste effluents and a better use of the tools themselves for future decommissioning work.
The main purpose of this work is a comparison of different cutting techniques for the same working conditions in order to determine the real cutting time, to improve the knowledge of the cutting tools and to evaluate the generated secondary wastes, cost aspects and the radiological impact.

The facility where the cuts take place, the analytical techniques and some test specifications have been described in the first annual progress report. Due to the different cutting time of the various tested tools, we have studied carefully the test procedure in order to compare the tools in the same conditions (at the steady state). The optimal conditions of cutting to minimize as much as possible the volume of wastes have been emphasized. All the measurements relating to cutting with the grinder, the reciprocating saw, the plasma arc torch and the air arc torch are almost completed. First comparisons have been drawn from these results. These comparisons concern the using range of the tools, the wear of the most exposed parts, the cutting speed (versus the thickness of the steel plate), the production of secondary wastes and their repartition (sedimented dross, attached slag, deposits on the cell walls, aerosols in exhaust duct).
WORK PROGRAMME

1. Preparation of the testing cell (CEA-Sac)

2. Cutting under inactive conditions with selected tools and materials (CEA-Valrho)

3. Cutting under simulated radioactive conditions (CEA-Valrho)

4. Secondary waste analysis after each specific cut (CEA-Sac)

5. Final evaluation of the cutting techniques assessed, including the cost of the basis tool, the associated logistic, the consumable part, the radiation exposure to workers and research of relevant radionuclides in the cell (All).

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

Commissariat à l'Energie Atomique (CEA)
Address
Centre D'études Nucléaires De La Vallée Du Rhône Cité De Marcoule
30205 Bagnols-sur-cèze
France

Participants (1)

Commissariat à l'Energie Atomique (CEA)
France
Address
Centre D'études De Saclay
91191 Gif-sur-yvette