title: Radiation induced spent nuclear fuel dissolution under deep repository conditions.
abstract: The dynamics of spent nuclear fuel dissolution in groundwater is an important part of the safety assessment of a deep geological repository for high level nuclear waste. In this paperwe discussthe most important elementary processes and parameters involved in radiation induced oxidative dissolution of spent nuclear fuel. Based on these processes, we also present a new approach for simulation of spent nuclear fuel dissolution under deep repository conditions. This approach accounts for the effects of fuel age, burn up, noble metal nanoparticle contents, aqueous H2 and HCO3- concentration, water chemistry, and combinations thereof. The results clearly indicate that solutes consuming H202 and combined effects of noble metal nanoparticles and H2 have significant impact on the rate of spent nuclear fuel dissolution. Using data from the two possible repository sites in Sweden, we have employed the new approach to estimate the maximum rate of spent nuclear fuel dissolution. This estimate indicates that H2 produced from radiolysis of groundwater alone will be sufficient to inhibit the dissolution completely for spent nuclear fuel older than 100 years.
authors.affiliation: KTH Chemical Science and Engineering, Nuclear Chemistry, Royal Institute of Technology, SE - 100 44 Stockholm, Sweden. matsj@kth.se
authors.forename: Mats
authors.initials: M
authors.lastname: Jonsson
authors.forename: Fredrik
authors.initials: F
authors.lastname: Nielsen
authors.forename: Olivia
authors.initials: O
authors.lastname: Roth
authors.forename: Ella
authors.initials: E
authors.lastname: Ekeroth
authors.forename: Sara
authors.initials: S
authors.lastname: Nilsson
authors.forename: Mohammad Mohsin
authors.initials: MM
authors.lastname: Hossain
mesh_terms: D007700:Kinetics; D010084:Oxidation-Reduction; D011850:Radioactive Waste; D012995:Solubility; D018505:Waste Management
chemical_list: D011850:Radioactive Waste