Method for surface decontamination
AssigneeAreva Np
InventorsRAINER GASSEN, BERTRAM ZEILER
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Abstract
A method for chemical decontamination of an oxide-coated surface of a metal structural part or of a system in a nuclear power plant with several cleaning cycles, involves oxidation steps, in which the oxide layer is treated with an aqueous solution containing an oxidation agent, and a subsequent decontamination step, in which the oxide layer is treated with an aqueous solution of an acid. At least one oxidation step is carried out in an acid solution and at least one oxidation step in an alkaline solution.
Claims7
A process for chemical decontamination of a surface having an oxide layer of a metallic component or of a system of a nuclear power station, which comprises the steps of:
- performing a plurality of cleaning cycles each containing oxidation steps in which the oxide layer is treated with an aqueous solution having an oxidant and a subsequent decontamination step in which the oxide layer is treated with an aqueous solution of an acid, wherein at least one of the oxidation steps is carried out in an acidic solution and at least one of the oxidation steps is carried out in an alkaline solution;
- and
- selectin the oxidant from the group consisting of O3, S2O82− and a cerium(IV) compound for use in the oxidation steps.
(canceled)
Dependencies are inferred from the claim text.