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Vitrified nuclear waste durability in complex natural environments

玻璃化核废料在复杂自然环境中的耐久性

基本信息

批准号：
EP/S012400/1
负责人：
Clare Thorpe
金额：
$ 51.11万
依托单位：
University of Sheffield
依托单位国家：
英国
项目类别：
Fellowship
财政年份：
2019
资助国家：
英国
起止时间：
2019 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FS012400%2F1
关键词：
Vitrified nuclear waste durability complex

项目摘要

Understanding the long-term durability of nuclear waste glass in the subsurface is important in the UK and internationally as many countries intend to dispose of vitrified radioactive waste in underground geological disposal facilities. In order to ensure safe disposal, we need to be confident that radioactive elements will remain isolated and immobilised for sufficient time to allow radioactivity to decay to safe levels. There will be multiple barriers in place (e.g. a metal container and engineered backfill) to delay groundwater from reaching the nuclear waste glass but eventually contact with water is expected. Although there are a number of laboratory tests currently used to determine the rate of glass dissolution in water all accelerate corrosion by increasing the temperature, surface area, or both and give very different predictions depending on the test conditions. Laboratory tests are also performed under simplified, stable, sterile conditions and using deionised water taking no account of how changing geochemical conditions will affect glass corrosion rates. This fellowship will combine materials science, geochemistry and geomicrobiology to study how glass corrodes in real-time in dynamic complex natural environments. I will improve understanding of key factors affecting corrosion (temperature, groundwater geochemistry, saturation, and microbiology) using the Ballidon long duration experiment, where glass samples have been buried for nearly 50 years. To predict the durability of nuclear waste glass thousands of years into the future I will study simulant nuclear waste glass's in conditions relevant to UK and US disposal concepts. The result of this novel investigation will be to critically evaluate, and improve, upon durability tests for glass, to build an improved model of glass corrosion and to establish further long duration experiments to inform the safety case for geological disposal in the UK and abroad.

了解地下核废料玻璃的长期耐久性在英国和国际上非常重要，因为许多国家打算在地下地质处置设施中处置玻璃化放射性废物。为了确保安全处置，我们需要确信放射性元素将保持隔离和固定足够的时间，以使放射性衰变到安全水平。将设置多个屏障（例如金属容器和工程回填）来延迟地下水到达核废料玻璃，但预计最终会与水接触。尽管目前有许多实验室测试用于确定玻璃在水中的溶解速率，但所有测试都通过增加温度、表面积或两者来加速腐蚀，并且根据测试条件给出非常不同的预测。实验室测试也在简化、稳定、无菌的条件下进行，并使用去离子水，不考虑地球化学条件的变化将如何影响玻璃腐蚀速率。该奖学金将结合材料科学、地球化学和地球微生物学，研究玻璃在动态复杂的自然环境中如何实时腐蚀。我将使用 Ballidon 长期实验（其中玻璃样品已埋藏近 50 年）来加深对影响腐蚀的关键因素（温度、地下水地球化学、饱和度和微生物学）的了解。为了预测核废料玻璃在未来数千年的耐久性，我将在与英国和美国处置概念相关的条件下研究模拟核废料玻璃。这项新颖研究的结果将是严格评估和改进玻璃的耐久性测试，建立改进的玻璃腐蚀模型，并建立进一步的长期实验，为英国和国外的地质处置安全案例提供信息。

项目成果

期刊论文数量（7）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Surface interfacial analysis of simulant high level nuclear waste glass dissolved in synthetic cement solutions

DOI：
10.1038/s41529-022-00279-5
发表时间：
2022-08
期刊：
npj Materials Degradation
影响因子：
5.1
作者：
C. Corkhill;Colleen Mann;Jeremy R. Eskelsen;D. Leonard;L. Mottram;M. Stennett;Jennifer M. S. Ayling;Clare L. Thorpe-;M. Cole;S. Nicholas;R. Tappero;E. Pierce
通讯作者：
C. Corkhill;Colleen Mann;Jeremy R. Eskelsen;D. Leonard;L. Mottram;M. Stennett;Jennifer M. S. Ayling;Clare L. Thorpe-;M. Cole;S. Nicholas;R. Tappero;E. Pierce

Localised extended ("vermiform") features formed during glass dissolution

玻璃溶解过程中形成的局部扩展（“蠕虫状”）特征