Details

Autor(en) / Beteiligte

• Hansson, N.L.
• Jonsson, M.
• Ekberg, C.
• Spahiu, K.

Titel

Modelling radiation-induced oxidative dissolution of UO2-based spent nuclear fuel on the basis of the hydroxyl radical mediated surface mechanism

Ist Teil von

• Journal of nuclear materials, 2023-05, Vol.578, p.154369, Article 154369

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •A novel combined radiolytic, kinetic and diffusion model was developed.•A simplified reaction set was compared to the full kinetic reaction set.•Optimal temporal and spatial resolutions were studied using the model.•A reaction system based on surface sites and surface bound OH· was studied.•The surface site system rate constants were fitted. A combined kinetic and diffusion model with an accurate α-dose rate profile was used to model radiation induced dissolution of UO2. Previous experimental data were used to fit the surface site reaction system involving the surface bound hydroxyl radical as an intermediate species for both UO2 oxidation and surface catalysed decomposition of H2O2. The performance of the model was explored in terms of sensitivity to spatial and temporal resolution as well as simplifications in the models describing the surface reactions and the reactions in solution. As a result, optimal conditions for running the numerical simulations were identified.