Description: Das Projekt "Schmelzen von radioaktivem Altmetall aus kerntechnischen Anlagen" wird vom Umweltbundesamt gefördert und von Siempelkamp Nuklear- und Umwelttechnik durchgeführt. Objective: This research is based on the results and experience of work carried out at Siempelkamp in the framework of the first five-year (1979-83) programme (ref.: eur 10021). The preceding research work proved that it is possible to melt down contaminated scrap by means of a modified industrial furnace device in compliance with the legal limits and regulations. This research work, therefore, aims mainly at the behaviour of radionuclides during the melting procedure, with regard to various material qualities and the harmless recycling of melted-down metal parts coming from refurbishing and decommissioning of nuclear installations. General information: b.1. Planning and design of the melt device taking into account an existing furnace. B.2. Construction of the needed melt device components. B.3. Melt work using as scrap contaminated carbon steel, stainless steel and its mixture. B.4. Evaluation of melt results. B.5. Technical, economical and radiological consequences. B.6. Extrapolation economical and radiological consequences. To large nuclear power plant and comparison with alternative modes with a view to the economical and environmental aspects. B.7. Melting of contaminated galvanised sheet material. B.8. Melting of non-ferrous metal (e.g. copper and brass) to investigate the behaviour of relevant radionuclides (e.g. co-60, cs-137) during the melting process. B.9. Investigation on adding radioactive carbon to the steel melt process to obtain cast iron of suitable quality for e.g. disposal containers. B.10. Investigation on the long-term behaviour of the furnace liner, the charging device and the filter system after melting of about 500 t of contamined steel waste (over two years) with particular view to activity concentration in the different parts of the melting plant. Achievements: To date, approximately 3500 tonnes of very low level contaminated steel components from the refurbishing and dismantling of various nuclear installations in Germany have been treated by melting. 95 per cent of the radioactivity was due to cobalt-60 and caesium-137 with an average ratio of 60:40. After melting, caesium was found in the slag and filter dust, whereas cobalt-60 mainly remained in the ingot (90-99 per cent). A special melting facility has been constructed to treat components which have been contaminated up to a level of 200 Bq/g in a controlled area. Approximately 2000 tonnes of steel components have been melted, so far, in this facility and to a large extent it has been recycled for nuclear purposes such as for transport and disposal containers and biological shieldings. One of the most important problems was to quantify the amount of secondary waste produced during melting (e.g. slag, filter dust). Melting of radioactive waste metal from the dismantling or refurbishing of nuclear installations has been assessed with respect to recycling (e.g. type A and type B containers for transport and/or final disposal, and shieldings). Long term tests ...
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Recycling ? Gusseisen ? Biopharmazeutikum ? Cäsium ? Kobalt ? Staubfilter ? Kupfer ? Abfallbehandlung ? Abfallverwertung ? Kohlenstoff ? Langzeitwirkung ? Nichteisenmetall ? Radioaktiver Abfall ? Altmetall ? Umweltauswirkung ? Bundesrepublik Deutschland ? Endlagerung radioaktiver Abfälle ? Strahlungsmessung ? Kernkraftwerk ? Radionuklid ? Rezyklat ? Schlacke ? Filter ? Transportbehälter ? Filterstaub ? Metall ? Edelstahl ? Pflanze des Jahres ? Kerntechnische Anlage ? Gelöster organischer Kohlenstoff ? Cäsium-137 ? Brennofen ? Langzeitverhalten ? Technikfolgenabschätzung ? Umwelttechnik ? Verfahrenstechnik ? Werkstoffkunde ? Abfall ? Fördertechnik ? Stahl ? Messing ? Rückbau ? Hochrechnung ? Schmelzen ? Abfallzusammensetzung ? Schmelzofen ? Kapselung ? Dekontamination ? Ofen ? Stilllegung ? Produktdesign ? Radioaktivität ? Wirtschaftliche Aspekte ? Lebenszyklus ? Legierung ? Technische Aspekte ? Metallverarbeitung ? Schadstoffverhalten ? Grenzwerteinhaltung ? Rechtmäßigkeit ? Maßstabsvergrößerung ? Anlagenbemessung ? Kontaminierter Abfall ? Galvanoabfall ?
Region: Nordrhein-Westfalen
Bounding box: 6.76339° .. 6.76339° x 51.21895° .. 51.21895°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 1984-11-01 - 1989-06-30
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