Objective
DISMANTLING PROCESSES PRODUCE EMISSIONS OF AEROSOLS WHICH CAN DISSEMINATE CONTAMINATION IN THE CELL WHERE THE CUTTING OPERATION TAKES PLACE, AND IN THE VENTILATION DUCTS UP TO THE HEPA FILTERS, THE LAST BARRIER BEFORE RELEASES INTO THE ENVIRONMENT. CUTTING PROCESSES, AND MAINLY THERMAL ONES, CAUSE RAPID PLUGGING OF HEPA FILTERS BECAUSE OF THE HIGH CONCENTRATIONS OF ULTRAFINE PARTICLES PRODUCED. TO INCREASE THE LIFE OF HEPA FILTERS AND THUS TO REDUCE THE AMOUNT OF SOLID WASTES, AN EFFICIENT CLEANABLE PREFILTERING DEVICE IS NECESSARY.
THE OBJECT OF THIS WORK IS TO : CATEGORISE THE AEROSOLS PRODUCED BY VARIOUS CUTTING TECHNIQUES, IDENTIFY THE POSSIBLE CAPTATION AND PREFILTRATRION DEVICES, SELECT THEM IN A REDUCED-SIZE MOCK-UP, EVALUATE THE SELECTED ONES ON AN EXPERIMENTAL RIG AND THEN USE THEM ON AN ACTUAL DISMANTLING SITE.
THIS SURVEY WILL BE DONE IN CO-OPERATION WITH UKAEA WINDSCALE.
A SUPPLEMENTARY AGREEMENT CONCLUDED IN 1987 PROVIDES A CO-OPERATION WITH HERIOT WATT UNIVERSITY, EDINBURGH, BY EXECUTION OF ON-SITE AEROSOL MEASUREMENTS.
Dismantling techniques, mainly thermal cutting tools, can create large amounts of airborne dust, possibly contaminated in the case of the cutting of radioactive materials. Among the secondary solid emissions, the aerosols constitute the most mobile part which can disseminate contamination in the cell where the cutting operation takes place.
Data has been collected on secondary emissions produced by various cutting techniques of metallic structures and complementary experimental studies made. Underwater plasma cutting and especially the influence of water depth have been studied. A prefiltration test rig has been built, which has been used at Windscale, in order to select an appropriate cleaning device.
B.1. COLLECTION OF DATA ON AEROSOLS AND FILTERS ASSOCIATED TO VARIOUS METAL CUTTING TECHNIQUES AND COMPLEMENTARY EXPERIMENTAL STUDIES ON ULTRAFINE PARTICLES.
B.2. DESIGN AND TESTING OF VARIOUS AEROSOL CAPTATION DEVICES AT THE AEROSOL GENERATING SOURCE.
B.3. DESIGN, TESTING AND FINAL SELECTION OF VARIOUS PRE-FILTRATION DEVICES IN A DOWN-SCALED TEST SECTION.
B.4. EVALUATION OF A SELECTED PREFILTERING SYSTEM IN A FULL-SCALE TEST SECTION WITH REAL CUTTING EFFLUENTS.
B.5. FINAL ASSESSMENT OF SELECTED CAPTATION AND PREFILTRATION DEVICES BY APPLICATION TO RADIOACTIVE AEROSOL SOURCES IN A DISMANTLING FACILITY.
B.6. EXECUTION AND EVALUATION OF MEASUREMENTS ON AEROSOL ARISINGS FROM UNDERWATER PLASMA ARC CUTTING TESTS OF STEEL SAMPLES AT HERIOT WATT UNIVERSITY, INCLUDING CHEMICAL ANALYSIS OF THE AEROSOLS.
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Coordinator
91191 Gif-sur-Yvette
France
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