Description: Das Projekt "Decontamination technique using a dispersed chemical agent" wird vom Umweltbundesamt gefördert und von Battelle-Institut e.V. durchgeführt. Objective: The objective of this research is to develop a technique using a chemical agent dispersed as fog for the decontamination of large size components of nuclear installations. The proposed project investigates the decontamination factors which can be achieved via this method using a lab-scale experimental setup focusing on the decontamination of austenitic steel. The programme essentially includes: Construction and testing of the experimental set up; adaptation of a droplet size and concentration measuring system; decontamination tests with nonactive samples to optimize the process parameters; decontamination tests with radioactive samples in order to verify the efficiency of this method. This research programme aims at obtaining consistent information on a new approach towards the decontamination of components of nuclear installations: decontamination by means of high affinity chemical reagents, in an aqueous medium for a good surface contact, using methods already existing in other technical fields. General Information: Work Programme. 1. Construction and testing of the experimental setup. 2. Adaptation of a droplet size and concentration measuring system. 3. Experiments with nonradioactive samples for the optimization of the process parameters. 4. Verification experiments with radioactive samples for the determination of the decontamination factor. Achievements: The objective of this research is to develop a technique using a chemical agent dispersed as fog for the decontamination of large size components of nuclear installations. The proposed project investigates the decontamination factors which can be achieved via this method using a lab-scale experimental setup focusing on the decontamination of austenitic steel. The first phase of the work has been performed. This covered lay out, construction and testing of an experimental setup, capable of producing and depositing an ultra fine fog of a chemical agent on a target surface, which consists in a first approach of a nonactive sample. The system contains a closed loop, where fine droplets of an etching fluid are generated in the 2 um size range via an ultrasonic transducer and deposited electrostatically on a metal target after passing a corona discharge section. The metal target consist of a rotating endless belt which faces the aerosol generator and a wiper on the back of the belt to collect the waste liquid for post investigation. To test the functions of the apparatus and to determine typical process parameters first experiments have been carried out successfully. The apparatus available now allows a direct automatic online measurement of the reaction kinetics of the etching process. The system is ready for the planned experiments with austenitic steel to optimize the process with nonradioactive samples and to demonstrate the method using radioactive samples determining the attainable decontamination factors.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Corona-Pandemie ? Messeinrichtung ? Aerosol ? Ätzender Stoff ? Kerntechnische Anlage ? Messprogramm ? Nebel ? Partikelgrößenverteilung ? Strahlenexposition ? Verfahrensparameter ? Verfahrensoptimierung ? Metall ? Radioaktive Dekontamination ? Abfall ? Chemikalien ? Dekontamination ? Kreislaufsystem ? Physikalisches Verfahren ? Radioaktive Kontamination ? Radioaktiver Stoff ? Stichprobe ? Ultraschall ? Umwelttechnik ? Verfahrenstechnik ? Vergleichsanalyse ? Laborversuch ? Stahl ? Rückbau ? Ökoeffizienz ? Partikel ? Informationsgewinnung ? Kenngröße ? Versuchsanlage ? Probenahme ? Anlagenbau ? Legierung ? Radioaktivität ? Reaktionskinetik ? Mehrfachnutzung ? Forschungsprogramm ? Aerosolherstellung ? Aerosolgenerator ? On-Line-Betrieb ? Anlagenbemessung ? Dispergierung ?
Region: Hessen
Bounding box: 9° .. 9° x 50.55° .. 50.55°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 1991-09-01 - 1993-03-31
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