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    • 4. 发明申请
    • PROCESS FOR DECONTAMINATING SURFACES
    • 去除表面的方法
    • WO1989003113A1
    • 1989-04-06
    • PCT/EP1988000870
    • 1988-09-28
    • ABB REAKTOR GMBHPAUL SCHERRER INSTITUTSCHENKER, Erhard
    • ABB REAKTOR GMBHPAUL SCHERRER INSTITUT
    • G21F09/00
    • G21F9/004
    • A process for decontaminating surfaces contaminated with radioactive substances, in particular of components of cooling circuits of nuclear reactors, comprises a first treatment stage with an aqueous decontaminating solution containing chromic acid and permanganic acid in a temperature range between 270 and 350 K, in particular at the usual ambient temperature. The contaminated surface layers are oxidized by the permanganic acid, whereas the chromic acid reduces the adherence of the modified surface layers. During a second treatment stage, the thus modified surface layers are dissolved by a chemical treatment in the same temperature range and/or removed by mechanical or hydraulic abrasion. Aqueous solutions of organic acids, to which reducing and complexing agents, and/or corrosion inhibitors can be added, are appropriate for the second stage of chemical treatment.
    • 用放射性物质特别是核反应堆的冷却回路部件去污染表面的方法包括在270至350K的温度范围内具有含有铬酸和高锰酸的水性去污溶液的第一处理阶段,特别是在 通常的环境温度。 污染的表面层被高锰酸氧化,而铬酸降低了改性表面层的粘附性。 在第二处理阶段期间,通过在相同温度范围内的化学处理将这样改性的表面层溶解和/或通过机械或液压磨擦除去。 可以加入还原剂和络合剂和/或腐蚀抑制剂的有机酸水溶液适用于化学处理的第二阶段。