MELTING OF CONTAMINATED STEEL SCRAP ARISING IN THE DISMANTLING OF NUCLEAR POWER PLANTS
About 2 t of scrap steel components have been studied during 16 melts and the melt products brought below a de minimize radioactivity concentration of 10 pCi g**-1. Radioactivity inventories for furnace systems have been made; in addition melts with known amounts of radioactivities have been diluted uniformly into steel to provide sample calibration standards and to measure dosage for plate rolled from the steel. The work shows: that 60-Co has finished entirely in steel and in uniform dilution in both electric arc and induction furnace melting; that Cs radioactivities do not enter steel and can be made to stay substantially in slag in the induction furnace. Under certain circumstances caesium can be retained in slag in the electric arc furnace. These results permit combined dilution - decontamination reclaim of selected nuclear steel scrap, indications being that considerable quantities of this would be treatable. Radiation dosage to melting plant operatives was negligible, nor was there any evidence of airborne radioactivity external to the furnace system. A projection has been made for a nuclear scrap reclaim program of 4000 t/a with overall contamination of 1 Ci 60-Co or equivalent, in respect of arisings of the scrap, preparation and routing to the steelworks, dosage in steelmaking and use of the product.
Bibliographic Reference: EUR 10188 EN (1985) MF, 58 P., BFR 150, BLOW-UP COPY BFR 290, EUROFFICE, LUXEMBOURG, POB 1003
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Record Number: 1989124079000 / Last updated on: 1987-01-01
Available languages: en