Basic leaching tests for pure beta long-lived emitters in radioactive wastes. (Ensayos de lixiviacion de emisores beta puros de larga vida)

摘要

Specimens for the two first leaching stages were manufactured using samples of virgin resins saturated in simulated conditions. EPIFLOC 21H resin was 50% saturated with NaCl and DUOLITE ARM-9381 resin was 100% saturated with NaCl+H(sub 3)BO(sub 3). Previously both resins were doped with Ni-63 and Sr-90. As far as the third leaching stage is concerning, samples of real resins from two Spanish nuclear power plants were used for manufacturing of leaching specimens. Because Sr-90 and Ni-63 radioactivity in these samples was not high enough to be detectable in leachate, samples were additionally loaded with Sr-90 and Ni-63 before mixing with cement. Leaching procedure was adapted to the French one (the same duration of leaching renewal steps and cumulative leaching time and also the same analytical preparation for chemical and radiochemical analysis). Specimens were hanged into leachant with nylon yarn and were surrounded by a leachant layer of 3 cm thickness. Additionally to Sr-90 and Ni-63, the main chemical elements present in cements used for manufacturing of specimens were analyzed in leachates from the two first leaching stages and the main gamma emitters present in the samples of real resins were analyzed in leachates from the third leaching stages. (Author)