Alpha dose rate and decay dose impacts on the long-term alteration of HLW nuclear glasses

Abstract In the prospect of deep geological disposal, the long-term behavior of high-level nuclear glasses has to be investigated regarding alpha radiation induced by long-life minor actinides. The present study focuses on the effects of alpha radiation on the long-term chemical reactivity of R7T7-t...

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Autores principales:	Magaly Tribet, Caroline Marques, Sarah Mougnaud, Véronique Broudic, Christophe Jegou, Sylvain Peuget
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492
Acceso en línea:	https://doaj.org/article/10640e9f2a744fe0b13eb4655df50e87
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spelling	oai:doaj.org-article:10640e9f2a744fe0b13eb4655df50e872021-12-02T16:14:53ZAlpha dose rate and decay dose impacts on the long-term alteration of HLW nuclear glasses10.1038/s41529-021-00183-42397-2106https://doaj.org/article/10640e9f2a744fe0b13eb4655df50e872021-07-01T00:00:00Zhttps://doi.org/10.1038/s41529-021-00183-4https://doaj.org/toc/2397-2106Abstract In the prospect of deep geological disposal, the long-term behavior of high-level nuclear glasses has to be investigated regarding alpha radiation induced by long-life minor actinides. The present study focuses on the effects of alpha radiation on the long-term chemical reactivity of R7T7-type glasses, by separately considering the alpha dose rate and the alpha decay dose. Old SON68 glasses doped with 238/239PuO2 or 244CmO2 were studied to simulate high alpha dose rates corresponding to an early water ingress and a high level of alpha decay doses corresponding to long-term disposal conditions. A part of the 238/239Pu-doped glass block was annealed to fully recover the irradiation-induced damage accumulated since the glass was fabricated and to dissociate the effect of the alpha dose rate from that of the alpha decay dose. The glasses were then leached under static conditions at 90 °C for several years. The results showed that the residual alteration rate is not affected by the alpha dose rate over a wide range of dose rate values expected under disposal conditions: this glass remained relatively insensitive to the alpha radiolysis phenomena at the glass–water interface. However, over the duration of the experiments, the residual alteration rate of the damaged 238/239Pu-doped glass was enhanced compared to that of the annealed glass. This result is in agreement with those obtained on the 244Cm-doped glass and with reported values in the literature on simplified externally irradiated glasses, indicating that the ballistic effects of the recoil nuclei are responsible for this increase in the residual alteration rate.Magaly TribetCaroline MarquesSarah MougnaudVéronique BroudicChristophe JegouSylvain PeugetNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492ENnpj Materials Degradation, Vol 5, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Magaly Tribet Caroline Marques Sarah Mougnaud Véronique Broudic Christophe Jegou Sylvain Peuget Alpha dose rate and decay dose impacts on the long-term alteration of HLW nuclear glasses
description	Abstract In the prospect of deep geological disposal, the long-term behavior of high-level nuclear glasses has to be investigated regarding alpha radiation induced by long-life minor actinides. The present study focuses on the effects of alpha radiation on the long-term chemical reactivity of R7T7-type glasses, by separately considering the alpha dose rate and the alpha decay dose. Old SON68 glasses doped with 238/239PuO2 or 244CmO2 were studied to simulate high alpha dose rates corresponding to an early water ingress and a high level of alpha decay doses corresponding to long-term disposal conditions. A part of the 238/239Pu-doped glass block was annealed to fully recover the irradiation-induced damage accumulated since the glass was fabricated and to dissociate the effect of the alpha dose rate from that of the alpha decay dose. The glasses were then leached under static conditions at 90 °C for several years. The results showed that the residual alteration rate is not affected by the alpha dose rate over a wide range of dose rate values expected under disposal conditions: this glass remained relatively insensitive to the alpha radiolysis phenomena at the glass–water interface. However, over the duration of the experiments, the residual alteration rate of the damaged 238/239Pu-doped glass was enhanced compared to that of the annealed glass. This result is in agreement with those obtained on the 244Cm-doped glass and with reported values in the literature on simplified externally irradiated glasses, indicating that the ballistic effects of the recoil nuclei are responsible for this increase in the residual alteration rate.
format	article
author	Magaly Tribet Caroline Marques Sarah Mougnaud Véronique Broudic Christophe Jegou Sylvain Peuget
author_facet	Magaly Tribet Caroline Marques Sarah Mougnaud Véronique Broudic Christophe Jegou Sylvain Peuget
author_sort	Magaly Tribet
title	Alpha dose rate and decay dose impacts on the long-term alteration of HLW nuclear glasses
title_short	Alpha dose rate and decay dose impacts on the long-term alteration of HLW nuclear glasses
title_full	Alpha dose rate and decay dose impacts on the long-term alteration of HLW nuclear glasses
title_fullStr	Alpha dose rate and decay dose impacts on the long-term alteration of HLW nuclear glasses
title_full_unstemmed	Alpha dose rate and decay dose impacts on the long-term alteration of HLW nuclear glasses
title_sort	alpha dose rate and decay dose impacts on the long-term alteration of hlw nuclear glasses
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/10640e9f2a744fe0b13eb4655df50e87
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Alpha dose rate and decay dose impacts on the long-term alteration of HLW nuclear glasses

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