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TREATMENT OF ACTIVE CONCRETE DUST BY SLURRY SETTING METHOD

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PREVIOUS WORK (REF: EUR 9568) ESTABLISHED THE PRINCIPLE OF SETTING CONCRETE DUST FROM A SLURRY WITH A SUITABLE SODIUM SILICATE SOLUTION.
THE OBJECTIVE OF THIS RESEARCH IS TO EVALUATE THE VIABILITY OF A METHOD OF IMMOBILISING RADIOACTIVE CONCRETE DUST ARISING FROM THE DISMANTLING OF REINFORCED CONCRETE STRUCTURES OF NUCLEAR INSTALLATIONS.THE CONCEPT TO BE INVESTIGATED INVOLVES THE FOLLOWING STEPS:

- MIX CONCRETE DUST WITH AN EXCESS OF SODIUM SILICATE SOLUTION TO MAKE A SLURRY.
- CAST THE SLURRY DIRECTLY INTO THE DISPOSAL BOX AND ALLOW IT TO SOLIDIFY;
- FILL WITH GROUT ANY SPACES, DUE TO SHRINKAGE, BETWEEN THE SOLIDIFIED SLURRY AND THE WALLS OF THE BOX, AND ANY SPACE UNDER THE LID.

AN ADDITIONAL OPTION IS TO DEMONSTRATE THAT LUMPS OF CONCRETE RUBBLE, OR POSSIBLY STEEL COMPONENTS AVALAIBLE AT THE SAME TIME, MAY BE PRE-PACKED IN THE BOX AND THE SLURRY INJECTED TO FILL THE SPACES.
THE RESEARCH IS DIRECTED MAINLY AT THE BIOLOGICAL SHIELDS OF EARLY MAGNOX REACTORS AND PRE-STRESSED CONCRETE PRESSURE VESSELS (PCPV) OF LATER MAGNOX AND ADVANCED GAS-COOLED REACTORS. STRUCTURES OF OTHER COMMERCIAL NUCLEAR POWER PLANTS IN THE EUROPEAN COMMUNITY, IN PARTICULAR THE PCPVS OF FRENCH GAS GRAPHITE REACTORS AND THE BIOLOGICAL SHILEDS OF LIGHT WATER REACTORS, WILL ALSO BE CONSIDERED.

B.1.- REVIEW OF OPERATIONAL REQUIREMENTS TO CAST A SLUURY INTO DISPOSAL BOXES WITH PARTICULAR VIEW TO COST EFFECTIVENESS.

B.2.- RE-CONSIDERATION OF BINDING MATERIAL (IE SODIUM SILICATE) WITH RESPECT TO THE THERMAL CONDITIONS OF THE REACTION.

B.3.- PROVISION OF TWO TYPES OF RELEVANT CONCRETE AND OF STEEL BOXES OF VARIOUS SIZES TO BE FILLED WITH CONCRETE SLURRY.

B.4.- LARGE-SCALE CASTING OF THE BOXES BY THE SLURRY METHOD AND ANALYSIS OF THE PHYSICAL PROPERTIES AND THE SHRINKAGE OF THE MATERIAL.

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CSC - Cost-sharing contracts

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Taylor Woodrow Construction Ltd
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Taywood House 345 Ruislip Road
UB1 2QX Southall
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