A crucible for immobilizing fission products in glass. The crucible is 35 cm high and has an outside diameter of 20 cm. The inside diameter is 17 cm. In operation, the fission products, in a concentrated nitric acid solution, are mixed with a glass-forming rock, nepheline syenite, suitably fluxed with lime. The mixture is heated to 1350 0C and allowed to cool thereby forming a glass. The first photo shows the crucible and a typical glass block while the second indicates the size of the block. The blocks were cast at CRNL and sets of twenty-five of them were then buried in a pattern in soil and the leach rate was monitored for a number of decades.
