Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT) (방사성폐기물학회지)

Korean Radioactive Waste Society (한국방사성폐기물학회)
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Characterisation and Durability of a Vitrified Wasteform for Simulated Chrompik III Waste

  • Walling, Sam A. (Immobilisation Science Laboratory, The University of Sheffield) ;
  • Gardner, Laura J. (Immobilisation Science Laboratory, The University of Sheffield) ;
  • Pang, H.K. Celine (Immobilisation Science Laboratory, The University of Sheffield) ;
  • Mann, Colleen (Immobilisation Science Laboratory, The University of Sheffield) ;
  • Corkhill, Claire L. (Immobilisation Science Laboratory, The University of Sheffield) ;
  • Mikusova, Alexandra (Vuje Inc.) ;
  • Lichvar, Peter (Vuje Inc.) ;
  • Hyatt, Neil C. (Immobilisation Science Laboratory, The University of Sheffield)
  • Received : 2021.06.25
  • Accepted : 2021.08.17
  • Published : 2021.09.30
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Abstract

Legacy waste from the decommissioned A-1 nuclear power plant in the Slovak Republic is scheduled for immobilisation within a tailored alkali borosilicate glass formulation, as part of ongoing site cleanup. The aqueous durability and characterisation of a simulant glass wasteform for Chrompik III legacy waste, was investigated, including dissolution experiments up to 112 days (90℃, ASTM Type 1 water). The wasteform was an amorphous, light green glassy product, with no observed phase separation or crystalline inclusions. Aqueous leach testing revealed a suitably durable product over the timescale investigated, comparing positively to other simulant nuclear waste glasses and vitreous products tested under similar conditions. Iron and titanium rich precipitates were observed to form at the surface of monolithic samples during leaching, with the formation of an alkali deficient alteration layer behind these at later ages. Overall this glass appears to perform well, and in line with expectations for this chemistry, although longer-term testing would be required to predict overall durability. This work will contribute to developing confidence in the disposability of vitrified Chrompik legacy wastes.

Keywords

Acknowledgement

This project has received funding from the Euratom research and training programme 2014-2018 under grant agreement No 755480 (THERAMIN). We wish to acknowledge the Henry Royce Institute for Advanced Materials, funded through EPSRC grants EP/R00661X/1, EP/S019367/1, EP/P02470X/1 and EP/P025285/1 for the financial support. CLC is grateful to EPSRC for the award of an ECR Fellowship (EP/N017374/1). This research utilised the HADES/MIDAS facility at the University of Sheffield established with financial support from EPSRC and BEIS, under grant EP/T011424/1 [23].

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