Corrosion of high burn-up structured UO2 fuel in presence of dissolved H2

Fors, Patrik; Carbol, Paul; Winckel, Stefaan Van; Spahiu, Kastriot

doi:10.1016/j.jnucmat.2009.07.004

Cited by 41 publications

(19 citation statements)

References 31 publications

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“…For this reason, in this work, the effect of both water vapor and hydrogen on the surface oxidation of UO2 is studied by using XPS. The knowledge of this interaction is not only necessary in the field of the dry storage, but also in the SNF geological disposal, where high amounts of hydrogen could be present due to the anoxic corrosion of the canister [10] together with water vapor due to fuel temperature.…”

Section: Introductionmentioning

confidence: 99%

UO 2 surface oxidation by mixtures of water vapor and hydrogen as a function of temperature

Espriu-Gascon

Llorca

Domínguez

et al. 2015

Journal of Nuclear Materials

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In the present work, X-Ray Photoelectron Spectroscopy (XPS) was used to study the effect of water vapor on the UO2 surface as a function of temperature. The experiments were performed in situ inside a high pressure chamber attached to the XPS instrument. UO2 samples were put in contact with either hydrogen or argon streams, saturated with water at room temperature, and the sample surface evolution was analyzed by XPS. In the case of the water vapor/argon experiments, one experiment at 350ºC was performed and, in the case of the water vapor/hydrogen experiments, the temperatures used inside the reactor were 60, 120, 200 and 350ºC. On one hand, in presence of argon, the results obtained showed that the water vapor in the argon stream oxidized 93% of the U(IV) in the sample surface. On the other hand, the degree of UO2 surface oxidation showed a different dependence on the temperature in the experiments performed in the presence of hydrogen: the maximum surface oxidation occurred at 120ºC, where 65.4% of U(IV) in the sample surface was oxidized, while at higher temperatures, the surface oxidation decreased. This observation is attributed to the increase of hydrogen reducing effect when temperature increases which prevents part of the oxidation of the UO2 surface by the water vapor.

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Section: Introductionmentioning

confidence: 99%

UO 2 surface oxidation by mixtures of water vapor and hydrogen as a function of temperature

Espriu-Gascon

Llorca

Domínguez

et al. 2015

Journal of Nuclear Materials

View full text Add to dashboard Cite

show abstract

“…The rate constants for reaction D, H, and L are based on the results of Refs. [29,59,60], respectively. Rate constants for I, J, and K have not yet been measured; however, based on general comparisons with noble metal and oxide catalysts, these values were assumed to be a factor of 200 greater than the corresponding constants on the oxide surface.…”

Section: Thermodynamic Basismentioning

confidence: 99%

“…One of the key results from these previous experimental and modeling studies has been that the dissolution rate of spent fuel can be strongly influenced by the so-called ''hydrogen effect'' (e.g., [4][5][6][7][8][9][10][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]). This term refers to the dramatic decrease in the dissolution rates of spent fuel and simulated fuels observed when tests are performed with various concentrations of dissolved hydrogen (e.g., [4][5][6][7][8][9][10], [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]).…”

Section: Introductionmentioning

confidence: 99%

“…This term refers to the dramatic decrease in the dissolution rates of spent fuel and simulated fuels observed when tests are performed with various concentrations of dissolved hydrogen (e.g., [4][5][6][7][8][9][10], [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]). As will be discussed below, the hydrogen effect can dominate all the other processes affecting spent fuel dissolution.…”

Section: Introductionmentioning

confidence: 99%

“…However, based on the large amount of experimental data demonstrating the importance of this effect [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31], ignoring the role hydrogen may prove to be overly conservative and unrealistic for some repository scenarios. Of the models mentioned above, three account for role of hydrogen in determining the dissolution rate of the fuel [4]: the MAM accounts for the hydrogen effect as homogeneous reactions in solution [6], the SUBATECH model accounts for hydrogen through its electrochemical effects at the fuel surface [4], and the KTH model contains catalytic reaction sites for hydrogen, which are associated with the fission product alloy phase (epsilon phase) present on the fuel surface [9].…”

Section: Introductionmentioning

confidence: 99%

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