Patent Number: 047611278
Section: description

In the drawing a drum 1 to receive radioactive wastes and a cement or grout is shown in phantom outline. The drum 1 comprises a cylindrical vessel having rolling rings 10 which is open at its upper end and located on a platform 2. The platform 2 is provided with three feet 3 spaced apart at equal intervals around the periphery of the drum. Each foot 3 is mounted on a respective pistonless pneumatic actuator. Each actuator comprises a cushion 4 which is connected through a respective hose pipe 5 to a manifold 6 which in turn is connected to compressed gas supply, conveniently compressed air, via isolation valve 7. The latter can be positioned at a location remote from the drum 1. For example, in the encapsulation of radioactive wastes, the drum can be located within a cave and behind shielding with the valve 7 outside the cave. In use, the drum 1 is positioned on the platform 2 with the cushions 4 in a deflated condition such that the upper open end of the drum can be located beneath the end of a charge chute 8. The cushions 4 are then inflated from the gas supply via valve 7 whereby to lift the drum such that its upper open end makes sealing contact with a plate 9 at the bottom of the charge chute and compress the rolling rings 10 by a pre-determined amount. Wastes together with cement or grout are delivered into the drum and at the same time a vibrator or vibrators 11 secured to and mounted under platform 2 is or are operated to thereby vibrate the drum and its contents but without breaking the sealing engagement between the end of the drum and the charge chute due to the pre-compression of the rolling rings. The amplitude of vibration is small, for example it can be a fraction of a millimetre and the frequency can be in the range 20 to 50 cycles per second. The vibration serves to pack efficiently the contents of the drum and assists in the distribution of the cement or grout about the radioactive wastes thereby avoiding voids and gaps within the drum. The sealing engagement serves to prevent possible contamination of the exterior of the drum during filling. After filling the cushions are deflated to permit removal of the drum.