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Eric Vance1 D. J. Gregg1 D. T. Chavara1

1, Australian Nuclear Science and Technology Organization, Kirrawee DC, New South Wales, Australia

Ceramics, glass-ceramics and glass nuclear waste forms can all be processed by hot isostatic pressing at temperatures up to ~1300°C and pressures up to 100 MPa in appropriately designed metal cans. The largest sizes demonstrated to be readily processed by this method are of the order of a few tens of litres. An important advantage for HIP processing is that no volatile losses occur at the final consolidation temperature because the waste plus additives is contained within the sealed metal HIP CAN. HIPing in the ANSTO laboratories has shown that robust waste forms with high aqueous durability can be produced for Purex-type reprocessing waste, spent fuel, borosilicate glass, Pu-containing ceramics and glass-ceramics, glass-ceramics formed from Hanford and Idaho HLWs, CuI, AgI sodalite and AgI, and 99Mo production wastes at ANSTO. The variety in the waste streams treatable by HIP processing demonstrates the flexibility of this technique and highlights its potential for treating orphan wastes.

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