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ELECTROCHEMICAL TECHNIQUE FOR THE SEGMENTING OF ACTIVATED STEEL COMPONENTS.

Objective

ELECTROCHEMICAL DECONTAMINATION HAS A GREAT IMPORTANCE DURING THE DECOMMISSIONING WORKS AT KRB-A. BY THIS METHOD A THIN METAL SURFACE LAYER IS REMOVED DUE TO A GALVANIC PROCESS IN AN ELECTROLYTIC SOLUTION. USING THE SAME PRINCIPLE, IT IS ALSO POSSIBLE TO REMOVE MATERIAL LOCALLY (ECM-TECHNIQUE).

MANY ADVANTAGES OF THIS METHOD INDICATE THAT IT COULD BE USED FOR DISASSEMBLING ACTIVATED COMPONENTS DURING DECOMMISSIONING OF NUCLEAR POWER PLANTS. IN ORDER TO INVESTIGATE ITS APPLICABILITY, EXPERIMENTS WITH NON-ACTIVE MATERIALS FROM A REACTOR PRESSURE VESSEL ARE CARRIED OUT.

IN THE RESEARCH PROGRAMME IT WILL BE ESTABLISHED :

- WHICH CATODES ARE MOST SUITABLE FOR HIGH CUTTING VELOCITIES.

- WHICH AMOUNT OF SLUDGE (WASTE) IS PRODUCED IN THE ELECTROLYTE.

THE WORK IN THIS CONTRACT WILL ASSESS WHETHER ELECTROCHEMICAL CUTTING OF ACTIVATED PARTS OF THE KRB-A REACTOR PRESSURE VESSEL IS A TECHNICALLY USEFUL, LOW-COST AND LOW RADIOACTIVE DOSE PROCEDURE.

THE EXPERIMENTS ARE CARRIED OUT IN AN EXISTING TEST FACILITY OF AEG-ELOTHERM IN REMSCHEID.
Electrochemical decontamination plays an important role in routine close-down procedures. This is done in an electrolyte solution passing a constant current and gradually clearing the metal surface. The same basic principle is used in the electrochemical metal treatment (ECM) technique. In this case, a specific cathode is used. This method has numerous advantages and can be used for separating active steel in nuclear reactor decommissioning. The areas which have been investigated are:
which treatment method, using which cathode will give a high rate of clearance;
how much sludge will remain behind in the electrolyte.
B.1. MODIFICATION OF AN EXISTING TEST FACILITY FOR THE TESTING OF STATIC AND DYNAMIC CATHODES.

B.2. IMPLEMENTATION OF PARAMETRIC STUDIES AND OF THE MAIN TEST PROGRAMME ON VARIOUS NON-ACTIVE REPRESENTATIVE STEEL PLATES.

B.3. EVALUATION OF THE OBTAINED RESULTS AND ELABORATION OF RECOMMENDATIONS FOR A POSSIBLE APPLICATION TO RADIOACTIVE COMPONENTS.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

Kernkraftwerk RWE - Bayernwerk GmbH
Address
1,Dr.-august-weckesser-strasse
89355 Gundremmingen
Germany