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Release of Residues from Melting Norm-Contaminated Steel Scrap. A German Approach.

DE2004826351

Publication Date	2003
Personal Author	Quade, U.; Thierfeldt, S.; Woerlen, S.
Page Count	12
Abstract	As many raw materials like crude oil, natural gas, mineral sands, phosphor ores and others are contaminated by radionuclides from the Uranium and/or Thorium decay chain (NORM), also plants for processing these materials became contaminated during operation. When plants are shut down, large quantities of pipes, valves, pumps and other components have to be scrapped. As scrap yards and steel mills are equipped by large detector systems to avoid an input of radioactivity into the steel cycle, decontamination is required before recycling. Siempelkamp is operating a melting plant for processing NORM and/or chemically/ toxically contaminated steel scrap. Beside the decontaminated steel as output, residues like slag and filter dust have to be managed within the range of licensed values. Based on the European Safety Standard the European member states have to implement radiation exposure from work activities with NORM in their Radiation Protection Ordinances (RPO). The German government revised the RPO in July 2001. Part 3 describes exposure limits for workers and for the public. Exposures from residues management have to meet 1 mSv/year. Brenk Systemplanung has performed calculations for assessing the radiation exposure from residues of the Siempelkamp melting plant. These calculations have been based on the input of metal from different origins and include all relevant exposure pathways in a number of scenarios. The calculations have been based on the dose criterion of 1 mSv/y as required by the German RPO. The methods and results will be presented.
Keywords	Metal scrap Steels Radioisotopes Radiation protection Raw materials Melting Contamination Occupational exposure Europe Residues Safety standards Germany Thorium Uranium
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Siempelkamp Giesserei K.G., Krefeld (Germany, F.R.).; Department of Energy, Washington, DC.; Brenk Systemplanung Ingenieurbuero fuer Wissenschaftlich-Technischen
Supplemental Notes	Prepared in cooperation with Brenk Systemplanung Ingenieurbuero fuer Wissenschaftlich-Technischen Umweltschutz, Aachen (Germany, F.R.). Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200511

Release of Residues from Melting Norm-Contaminated Steel Scrap. A German Approach.

Release of Residues from Melting Norm-Contaminated Steel Scrap. A German Approach.
DE2004826351

Publication Date	2003
Personal Author	Quade, U.; Thierfeldt, S.; Woerlen, S.
Page Count	12
Abstract	As many raw materials like crude oil, natural gas, mineral sands, phosphor ores and others are contaminated by radionuclides from the Uranium and/or Thorium decay chain (NORM), also plants for processing these materials became contaminated during operation. When plants are shut down, large quantities of pipes, valves, pumps and other components have to be scrapped. As scrap yards and steel mills are equipped by large detector systems to avoid an input of radioactivity into the steel cycle, decontamination is required before recycling. Siempelkamp is operating a melting plant for processing NORM and/or chemically/ toxically contaminated steel scrap. Beside the decontaminated steel as output, residues like slag and filter dust have to be managed within the range of licensed values. Based on the European Safety Standard the European member states have to implement radiation exposure from work activities with NORM in their Radiation Protection Ordinances (RPO). The German government revised the RPO in July 2001. Part 3 describes exposure limits for workers and for the public. Exposures from residues management have to meet 1 mSv/year. Brenk Systemplanung has performed calculations for assessing the radiation exposure from residues of the Siempelkamp melting plant. These calculations have been based on the input of metal from different origins and include all relevant exposure pathways in a number of scenarios. The calculations have been based on the dose criterion of 1 mSv/y as required by the German RPO. The methods and results will be presented.
Keywords	Metal scrap Steels Radioisotopes Radiation protection Raw materials Melting Contamination Occupational exposure Europe Residues Safety standards Germany Thorium Uranium
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Siempelkamp Giesserei K.G., Krefeld (Germany, F.R.).; Department of Energy, Washington, DC.; Brenk Systemplanung Ingenieurbuero fuer Wissenschaftlich-Technischen
Supplemental Notes	Prepared in cooperation with Brenk Systemplanung Ingenieurbuero fuer Wissenschaftlich-Technischen Umweltschutz, Aachen (Germany, F.R.). Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200511