Beschichtungsmaterialien für Abfallgebinde im Nuklearbereich

摘要

Im Rahmen eines Forsehungs- und Entwicklungsvorhabens wurden Untersuchungen zur Aussagefähigkeit von Prüfkriterien an nichtmetallischen Be-schichtungen für Anlagen und Behälter zur Entsorgung radioaktiver Stoffe durchgeführt. Die Ergebnisse über den Einfluss von Energiedosisleistungen in sauerstoffhaltiger und teilweise auch sauerstoffreduzierter Atmosphäre nach Bestrahlung bis zu Energiedosen von 10~7 Gy (10 M Gy) sowie der Dekon-taminierbarkeit und Chemikalienbestän-digkeit werden vorgestellt.%The validity of test criteria was examined in a research and development project conducted on non-metallic coatings for plants and vessels used in the disposal of radioactive materials. The results obtained about the influence of energy dose rates in oxygen-bearing and, partly, oxygen-reduced atmospheres after irradiation up to energy doses of 107 Gy (10 MGy), and about the decontamination capability and resistance to chemicals, are presented. Before and after irradiation with 0.3 MGy, all six coatings selected were very easily decontaminated. Out of the specimens irradiated with 3 MGy, three were decontaminated excellently and three were decontaminated well. After irradiation with more than 3 MGy, damage to the coatings from chemicals increases, and the decontamination capability continues to decrease. The consequence to be drawn is that the high expense involved in terms of irradiation time, duration of the tests, and costs is in no meaningful relation to the expected test result. Moreover, coatings are exposed to more than 3 MGy of radiation from radioactive residues only in exceptional cases.