Irradiation Impact on the Leaching Behavior of HLW Glasses

Tribet, M.; Rolland, Séverine; Peuget, S.; Broudic, V.; Magnin, Magali; Wiss, T.; Jégou, Christophe

doi:10.1016/j.mspro.2014.10.027

Cited by 18 publications

(25 citation statements)

References 9 publications

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“…Until now, alpha decay irradiation impact on glass leaching behavior focused on the initial alteration rate of SON68 complex glasses, measured by Soxhlet-mode dynamic leach tests at 373 K from both actinide-doped glasses and externally irradiated glasses with heavy ions. 34,35 And, in every case (doped or externally irradiated complex glasses), no effect of irradiation on this initial alteration rate was evidenced. This suggests that the main mechanisms involved in both leaching steps are different and/or that the glass composition has an important role on the leaching glass response to irradiation.…”

Section: Macroscopic Property Changesmentioning

confidence: 89%

“…Further studies on all the leaching steps would improve the understanding of the glass response to radiation damage, and could assess if all the leaching mechanisms are impacted at the same level, as until now no impact of the alpha decay dose was quantified on SON68 glass from the initial alteration rate values. 34,35 Furthermore, the longterm Cm-ISG glass chemical durability must be assessed and compared to the present results obtained from externally irradiated samples in order to complete the knowledge on the representativeness of alpha decay self-irradiation by heavy ion irradiation.…”

Section: Simulation Of Alpha Decay Self-irradiation By Heavy Ions Irrmentioning

confidence: 99%

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Radiations effects in ISG glass: from structural changes to long-term aqueous behavior

et al. 2018

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The aim of the studies about the stability of nuclear glasses is to predict as accurately as possible their behavior over geological timescale. It requires the development of experimental methods to accelerate their irradiation and leaching ageing. This study focuses on the International Simple Glass behavior under irradiation by evaluating its structural and macroscopic property evolutions, and also its long-term chemical durability. Two irradiation ageing scenarios are considered: an alpha self-irradiation of a 244 Cm-doped-ISG glass and an external irradiation with few MeV gold ions of non-radioactive ISG glass coupons. The results obtained from the Raman spectroscopy, density, and hardness measurements led to the conclusion that ballistic effects from the recoil nuclei are responsible of the changes with dose observed under alpha self-irradiation and that the ISG glass is a good surrogate of the French nuclear SON68 complex glass under such irradiation conditions. The assessment of the structural evolution with dose of this glass reinforces the mechanistic concepts about the glass response under alpha self-irradiation damage, where the glass response to a recoil nucleus event is the result of a very fast quenching of the damaged zone in the displacement cascade. Furthermore, the irradiation damage induced by gold ions does not fully mimic the 244 Cm-doped glass evolution with nuclear dose, since the results of this simulation method overestimates the amplitude of the irradiation damage in the glass because the effects of the alpha particle are not included. Finally, this study demonstrates that the ISG glass water alteration at high-reaction progress is impacted by the glass damage, which indicates that the long-term glass chemical durability will depend on the glass structure when water arrives in contact.

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Section: Macroscopic Property Changesmentioning

confidence: 89%

Section: Simulation Of Alpha Decay Self-irradiation By Heavy Ions Irrmentioning

confidence: 99%

Radiations effects in ISG glass: from structural changes to long-term aqueous behavior

et al. 2018

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“…SBN-955 (K=18 not shown in Fig. 4) had a higher final density (2.77 g/cm 3 ) than expected and there could be two possible explanations for this: (a) the dependence of density on the quenching temperature, in particular some fivefold-coordinated Si species were found, which might contribute to the high density (b) the low number of Na and B atoms, which reduces the chances for [BO 4 ] -+ Na entities to form and favoring BO 3 , in fact almost half of Na was used up in placing NBOs' on Si and [3] B. Fig.…”

Section: Evolution Of Pressure With Deposited Energymentioning

confidence: 99%

“…5, for mean boron coordination (C B ) with composition, is in agreement with the Dell and Bray model and experimental results [55,56] . At high K (K') (low alkali concentration), Na primarily acts as charge compensator converting [3] B to [4] B, resulting in a gradual increase of C B . As K (K') starts to decrease (increasing alkali concentration), Na changes its role to a network modifier leading to low C B values.…”

Section: Coordination Of Glass Formersmentioning

confidence: 99%

“…To confine radionuclides (RN), a glass must present a high physical and chemical durability. Under repository conditions, RN are expected to stay confined until the glass matrix has been reached by groundwater and begins to corrode [3]. Consequently, glass corrosion has been studied extensively, focusing primarily on the effects of environmental conditions (pH, temperature, glass-surface-to-solution-volume ratio) and glass compositions, and different regimes of alteration have been identified (initial alteration rate, residual rate, and resumption rate [4,5]) .…”

Section: Introductionmentioning

confidence: 99%

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Molecular dynamics simulation of ballistic effects in simplified nuclear waste glasses

Jan

Delaye

Gin

et al. 2019

Journal of Non-Crystalline Solids

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Ballistic effects in simple sodium borosilicate () and sodium alumino-borosilicate glasses () were investigated using molecular dynamics simulations. Specifically, the glasses were irradiated with heavy projectiles that caused atomic displacements by elastic collisions (displacement cascades) and progressively damaged the bulk glass. The accumulated pressure and internal energy inside the glass were found to saturate with deposited energy. Furthermore, structural analysis of the irradiated glasses revealed several important ballistic effects including a decrease in glass density, depolymerization of the borosilicate network, and increase in chemical mixing, short range and intermediate disorder. The magnitude of radiation damage was found to depend on the glass composition and, in general, alumino-borosilicate glasses were found to be slightly less damaged, after irradiation, as compared to borosilicate glasses.

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Nuclear Glasses

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2023

Nuclear Materials Under Irradiation

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Irradiation Impact on the Leaching Behavior of HLW Glasses

Cited by 18 publications

References 9 publications

Radiations effects in ISG glass: from structural changes to long-term aqueous behavior

Radiations effects in ISG glass: from structural changes to long-term aqueous behavior

Molecular dynamics simulation of ballistic effects in simplified nuclear waste glasses

Nuclear Glasses

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