EP 0313843 B2 19980513 - Process for decontaminating surfaces
Title (en)
Process for decontaminating surfaces
Title (de)
Verfahren zur Dekontamination von Oberflächen
Title (fr)
Procédé pour décontaminer des surfaces
Publication
Application
Priority
CH 384687 A 19871002
Abstract (en)
[origin: WO8903113A1] 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.
IPC 1-7
IPC 8 full level
CPC (source: EP KR US)
G21F 9/00 (2013.01 - KR); G21F 9/004 (2013.01 - EP US)
Designated contracting state (EPC)
BE DE ES FR GB IT NL SE
DOCDB simple family (publication)
EP 0313843 A1 19890503; EP 0313843 B1 19920708; EP 0313843 B2 19980513; CH 673545 A5 19900315; DE 3872656 D1 19920813; ES 2034088 T3 19930401; ES 2034088 T5 19981001; JP H02503600 A 19901025; KR 890702211 A 19891223; KR 970011260 B1 19970708; US 5093073 A 19920303; WO 8903113 A1 19890406
DOCDB simple family (application)
EP 88116003 A 19880928; CH 384687 A 19871002; DE 3872656 T 19880928; EP 8800870 W 19880928; ES 88116003 T 19880928; JP 50803288 A 19880928; KR 890700977 A 19890601; US 39744089 A 19890707