Patent Number: 047675721
Section: claims

1. A method of making a radiation shielding structure for a nuclear installation which comprises the steps of: (a) deriving a radioactive residue having a cobalt 60 equivalent specific activity between 50 Bq/g and 100 Bq/g from a nuclear reactor installation;  (b) incorporating said radioactive residue in a composition; and  (c) forming said composition into a radiation shielding solid structure. 2. The method defined in claim 1 wherein said residue is derived from concrete parts of said installation. 3. The method defined in claim 2 wherein said residue is derived from metal parts of said installation. 4. The method defined in claim 1 wherein said residue is comminuted and incorporated into a concrete composition as an aggregate. 5. The method defined in claim 1 wherein said residue is smelted in the formation of said composition to form a casting melt. 6. The method defined in claim 5 wherein said casting melt is cast to form a transport and storage vessel constituting the radiation shielding structure. 7. The method defined in claim 6 wherein additional alloying elements are added to said residue in the formation of said melt. 8. A radiation shielding structure made by the method defined in claim 1. 9. The use of a radioactive nuclear plant residue having a cobalt 60 equivalent specific activity between 50 Bq/g and 100 Bq/g as a material for the production of radiation shielding structures. 10. A method for the use of comminuted radioactive concrete, having previously been a building component for a nuclear installation, as a construction material in a new concrete radiation shielding structure, said comminuted concrete having a cobalt 60 equivalent to specific activity between 50 Bq/g and 100 Bq/g. 11. A method for the use of radioactive contaminated metal parts, previously having been a structural component of a nuclear installation, as a part of a new radiation shielding structure in the form of a transport and storage vessel, said radioactive metal parts having a cobalt 60 equivalent specific activity between 50 Bq/g and 100 Bq/g.