THE MAIN OBJECTIVE OF THIS RESEARCH IS THE DEVELOPMENT OF A DECONTAMINATION PROCEDURE BY APLYING INTO THE CONTAMINATED SURFACE (IN A ONE-STEP OR MULTI-STEP PROCESS) PASTY, CHEMICALLY AGGRESSIVE AGENTS CAUSING DILUTION AND ABSORPTION OF THE CONTAMINANT AND THEN HARDENING TO FORM A STRIPPABLE FOIL. THE USE OF SUCH A FOIL WILL RESULT IN FOLLOWING ADVANTAGES, WITH RESPECT TO USUAL TECHNIQUES :
-SENSIBLY SHORTER OPERATING DURATION RESULTING IN LOWER PERSONNEL DOSES;
- REDUCTION OF THE ARISING SECONDARY WASTE VOLUME BECAUSE THERE IS NO NEED FOR WASHING; THE VOLUME OF THE SPENT STRIPPABLE FOIL IS MUCH SMALLER THAN CURRENTLY USED WATER VOLUMES;
- OPTIMAL CONDITIONING OF THE RADIOACTIVE WASTE DUE TO ITS FIXATION IN A SOLID (FOIL).;
- AN ACCIDENTAL CONTAMINATION IN A CONTROLLED AREA CAN EASILY BE FIXED AND COVERED AVOIDING ITS PROPAGATION.
An in situ decontamination procedure which involves applying (in a 1-step or multistep process) a corrosive chemical paste to the contaminated surface has been developed. These chemical agents dilute and adsorb the contaminant and then harden to form a removeable foil.
The use of this kind of foil has the following advantages:
a significantly shorter operation duration resulting in lower personnel doses;
a reduction in the secondary waste volume produced because there is no need for washing (the volume of the spent removeable foil is much smaller than currently used water volumes);
the radioactive waste is in its optimal form because it is attached to a solid (foil);
accidental contamination in a controlled area can easily be treated and covered to prevent it spreading.
B1. DEVELOPMENT AND OPTIMISATION OF A HIGH-QUALITY STRIPPABLE FOIL, READY FOR INDUSTRIAL APPLICATION, TAKING INTO CONSIDERATION VARIOUS PHYSICAL AND CHEMICAL PROPERTIES, SUCH AS ABILITY TO DECONTAMINNATION, STRONG ADHESION, APPROPRIATE VISCOSITY, LEAK-TIGHTNESS, TENSILE STRENGTH.
B2. DEVELOPMENT OF THE MOST APPROPRIATE OPERATION PROCEDURES, INCLUDING DIFFERENT DEPOSITION METHODS AND AN OPTIMISATION OF THE LAYER THICKNESS.
B3. COMMISSIONING TESTING UNDER REALISTIC CONDITIONS, INCLUDING VARIOUS TYPES OF SURFACES AND TESTS WITH RADIOACTIVE CONDITIONS IN HOT CELLS.
B4. DEVELOPMENT OF A TECHNOLOGY FOR INDUSTRIAL APPLICATION, INCLUDING THE PREPARATION OF A USERS' MANUAL, TAKING ACCOUNT OF GAINED PRACTICAL EXPERIENCE.