Experimental study of UC polycrystals in the prospect of improving the as-fabricated sample purity

Raveu, Gaëlle; Martin, Guillaume; Fiquet, Olivier; Garcia, Philippe; Carlot, G.; Palancher, H.; Bonnin, Anne; Khodja, H.; Raepsaet, Caroline; Sauvage, Thierry; Barthe, M.F.

doi:10.1016/j.nimb.2014.09.007

Cited by 4 publications

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“…This assumption, of an instantaneously spalling oxide product layer, allows the oxidation kinetics to be simply represented by Eq. (1) and (2). It is observed by Berthinier et al [12,13] that further oxidation of the UO 2 occurs under most conditions, producing higher oxides such as U 3 O 8 and U 3 O 7 .…”

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confidence: 91%

“…Uranium carbide (UC) is a candidate fuel for use in Generation IV nuclear reactors [1,2]. Its appeal stems from a high thermal conductivity compared to the oxide form [3,4] allowing for easier regulation of fuel bed temperatures, and a higher density of heavy metal atoms making it a better plutonium breeder -an invaluable characteristic for fast reactor fuel.…”

Section: Introductionmentioning

confidence: 99%

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Mathematical modelling of the pre-oxidation of a uranium carbide fuel pellet

Shepherd

Fairweather

Heggs

et al. 2015

Computers & Chemical Engineering

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Uranium carbide is a candidate fuel for future nuclear reactors. However, for it to be implemented in a closed fuel cycle, an outline for its reprocessing is necessary. One proposed method is to oxidise the uranium carbide into uranium oxide which can then be reprocessed using current infrastructure. A mathematical model describing the heat and mass transfer processes involved in such an oxidation has been constructed. The available literature was consulted for reaction coefficients and information on reaction products. A stable and convergent numerical solution has been developed using a combination of finitedifference approximations of the differential equations. Completion times of approximately 3-30 hours are predicted given a spherical pellet with a radius of 9.35 under varying initial conditions. The transient temperature distribution throughout the system is predicted, with a maximum temperature of 1458° observed from an initial temperature of 500° at an oxygen concentration of 3.15 .

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confidence: 91%