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DISMANTLING, PARTLY IN-SITU, OF A GLOVE-BOX STRUCTURE OF A MIXED-OXIDE FUEL PLANT.

Objective

THE DECOMMISSIONING OF STANDARD-SIZE PLUTONIUM GLOVE BOXES HAS BEEN PERFORMED IN SEVERAL COUNTRIES FOR MANY YEARS. HOWEVER, THE DISMANTLING OF VERY LARGE ALPHA-CONTAMINATED UNITS IS STILL A RATHER EXCEPTIONAL TASK.
PLUTONIUM RESEARCH LABORATORIES AND MIXED-OXIDE FUEL FABRICATION PLANTS HAVE TO BE DISMANTLED IN THE NEAR FUTURE. DURING THESE DISMANTLING TASKS, SEVERE PROBLEMS WILL ARISE WITH THE DECOMMISSIONING OF LARGE GLOVE-BOX STRUCTURES CONTAINING BIG AND HEAVY EQUIPMENT. SUCH UNITS HAVE TO BE PARTIALLY DISMANTLED ON PLACE AND THEN TRANSPORTED TO AN AD-HOC INSTALLATION FOR FURTHER DISMANTLING AND FINAL DISPOSAL.
THE TECHNIQUES USED UNTIL NOW FOR THE CONDITIONING OF STANDARD-SIZE GLOVE BOXES ARE NOT DIRECTLY APPLICABLE IN THE CASE OF A COMPLEX GLOVE-BOX STRUCTURE, TO BE DISMOUNTED PARTIALLY ON PLACE.
THE OBJECTIVE OF THIS RESEARCH IS TO DEVELOP ADEQUATE TECHNIQUES FOR DECOMMISSIONING AND PARTIAL DISMANTLING OF LARGE ALPHA-CONTAMINATED UNITS AND TO DEMONSTRATE THEIR FEASIBILITY BY CARRYING OUT SUCH A TASK WITHIN A PREFIXED TIME SCHEDULE AND IN RESPECT TO SAFETY AND COST.
THIS WORK COMPLEMENTS CONTRACT FI1D002400 "DECOMMISSIONING OF VERY LARGE GLOVE BOXES" OF THE PRESENT RESEARCH PROGRAMME.
WORKING PACKAGES B.2. AND B.3. OF THE INITIAL WORK PROGRAMME HAD TO BE ABANDONED FOR LICENSING REASONS. IN A SUPPLEMENTARY AGREEMENT CONCLUDED IN 1988, THE PRESENT REPLACEMENT PROGRAMME WAS DEFINED, CONCERNING STUDIES INTO THE FEASIBILITY OF PU/U OXIDE-CONTAMINED GLOVE BOX CLEANING BY BLASTING WITH DEEP FROZEN CO2 GRIT.

B.1. CONCEPTION OF A WORK PROCEDURE, PREPARATION OF SPECIAL EQUIPMENT,CONDITIONING AND DISMOUNTING OF THE GLOVE BOX.
B.2. CONCEPTION AND EXECUTION OF TESTS INTO CLEANING WITH DEEP-FROZEN CO2 GRIT BLASTING ON NON-ACTIVE GLOVE BOX SAMPLES.
B.2.1. CONCEPTION AND CONSTRUCTION OF AN EXPERIMENTAL FACILITY.
B.2.2. DEFINITION AND PREPARATION OF NON-RADIOACTIVE SAMPLES SIMULATING A PU/U OXIDE CONTAMINATION.
B.2.3. CO2 GRIT BLASTING TESTS WITH SUBSEQUENT ANALYSIS OF DECONTAMINATION EFFECTS.
B.2.4. COMPARATIVE TESTS WITH WATER, FREON AND CO2 GRIT AND SAFETY ANALYSIS WITH RESPECT TO AN APPLICATION ON RADIOACTIVE COMPONENTS.
B.3. CONCLUSIVE ASSESSMENT OF PRE-CLEANING BY BLASTING OF DEEP FROZEN CO2 GRIT OF PU/U OXIDE-CONTAMINATED GLOVE BOXES BEFORE DISMANTLING.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

Belgonucléaire
Address
25,Place Du Champ De Mars
1050 Bruxelles
Belgium