Editors : B. Begg, D.S. Dunn, C. Poinssot
a1 firstname.lastname@example.org, Nexia Solutions Ltd, Materials and Products, The Technology Centre, Sellafield, Seascale, CA20 1PG, United Kingdom, +441946779341, +441946779007
a2 email@example.com, Nexia Solutions Ltd, The British Technology Centre, Sellafield, Seascale, CA20 1PG, United Kingdom
a3 firstname.lastname@example.org, University of Sheffield, Immobilisation Science Laboratory, Sir Robert Hadfield Building, Mappin Street, Sheffield, S1 3JD, United Kingdom
a4 email@example.com, University of Sheffield, Immobilisation Science Laboratory, Sir Robert Hadfield Building, Mappin Street, Sheffield, S1 3JD, United Kingdom
The Nuclear Decommissioning Authority (NDA) has taken over ownership of the majority of the UK's separated civil plutonium stocks, which are expected to exceed 100 metric tons by 2010. Studies to technically underpin options development for the disposition of these stocks, for example by immobilization or re-use as fuel, are being carried out by Nexia Solutions on behalf of NDA. Three classes of immobilization matrices have been selected for investigation by means of previous studies and stakeholder dialogue: ceramic or crystalline wasteforms, storage MOx, and vitreous or glass-based wasteforms. This paper describes the preliminary inactive experimental program for the vitrification option, with results from a wide range of glass compositions along with conclusions on their potential use for plutonium immobilization.
Following review, four glass systems were selected for preliminary investigation: borosilicate, lanthanide borosilicate, aluminosilicate and phosphate glasses. A broad survey of glass properties was completed in order to allow meaningful evaluation, e.g. glass formulation, waste loading, chemical durability, thermal properties, and viscosity. The program was divided into two parts, with silicate and phosphate glasses being investigated by Nexia Solutions and the Immobilisation Science Laboratory (ISL) at the University of Sheffield respectively.
(Received February 28 2007)
(Accepted April 12 2007)
(Online publication October 19 2011)