Immobilisation of Prototype Fast Reactor raffinate in a barium borosilicate glass matrix

JOURNAL OF NUCLEAR MATERIALS

卷:508

Article

Heath, Paul G.¹  Corkhill, Claire L.¹  Stennett, Martin C.¹  Hand, Russell J.¹  Whales, Kieran M.¹  Hyatt, Neil C.¹ 

[1] Univ Sheffield, Immobilisat Sci Lab, Sir Robert Hadfield Bldg,Mappin St, Sheffield S1 3JD, S Yorkshire, England

关键词: Amorphous materials;    Waste immobilisation;    Mechanical properties;   

DOI  :  10.1016/j.jnucmat.2018.05.015

来源: Elsevier

【 摘 要 】

The vitrification of Dounreay Prototype Fast Reactor (PFR) Raffinate in a barium borosilicate glass matrix was investigated, with the aim of understanding process feasibility and the potential benefits over the current baseline of cement encapsulation. Laboratory scale glass melts demonstrated the production of homogeneous glasses incorporating at least 20 wt% simulant PFR waste (on an oxides basis), with no detectable crystalline accessory phases. The hardness and indentation fracture toughness of the simulant PFR waste glasses were determined to be comparable to those of current UK high level waste glass formulations. The normalised dissolution rate of boron from the simulant PFR glasses was determined to be 3 x 10(-2)gm(-2) d(-1), in 18.2 M Omega water at 90 degrees C and surface area/volume ratio of 1500 m(-1), only a factor of two greater than the French SON-68 simulant high level waste glass, under comparable conditions. Consequently, the simulant PFR waste glasses show considerable promise for meeting envisaged waste acceptance criteria for geological disposal. Overall, the superior stability of vitrified PFR wasteforms could enhance the safety case for long term near surface storage of radioactive wastes, mandated by current Scottish Government policy. (C) 2018 Published by Elsevier B.V.

【 授权许可】

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