Radiolytic corrosion of copper

铜的辐射腐蚀

• 批准号: 469090-2014
• 负责人: Shoesmith, David
• 金额: $ 8.45万
• 依托单位: University of Western Ontario
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=598398
• 关键词: Radiolytic; corrosion; copper

The present management scenario for the permanent disposal of high level nuclear waste is to bury it in sealed metallic containers buried in a deep stable geologic repository. The primary function of the waste container is to isolate the radioactive waste form from groundwater until radioactivity levels have decayed to innocuous levels. For the present thick-walled container design gamma radiation fields on the outside of the container would have a negligible influence on container corrosion. However, to overcome a number of fabrication and welding issues, thinner walled containers are being contemplated making a reassessment of the influence of gamma radiation on container corrosion a potential licensing requirement. This project addresses this issue by proposing a study of radiation effects on corrosion under simulated repository conditions, which will evolve from initially hot and dry to warm, aerated, and humid and eventually cool, aqueous and anoxic. A program of electrochemical, analytical and corrosion experiments will be employed to determine the mechanistic features of the corrosion process and to determine the evolution of corrosion damage as waste repository conditions evolve and radiation fields decay. A model will be developed to assess the extent to which the container wall can be thinned without compromising container corrosion performance.

永久处理高核废料的当前管理方案是将其埋在埋藏在深层稳定地质储存库中的密封的金属容器中。废物容器的主要功能是将放射性废物形式从地下水隔离，直到放射性水平腐烂到无害水平。对于目前的厚壁容器设计，容器外部的伽马辐射场将对容器腐蚀产生可忽略的影响。但是，为了克服许多制造和焊接问题，正在考虑重新评估伽马辐射对容器腐蚀的影响，这是潜在的许可要求。该项目通过提出对模拟的存储库条件下对腐蚀的辐射影响的研究来解决此问题，该辐射对腐蚀的影响将从最初的热干燥，温暖，充气，潮湿，最终凉爽，水性和缺氧。将采用电化学，分析和腐蚀实验的程序来确定腐蚀过程的机械特征，并确定随着废物储存库条件的发展和辐射场的衰变，腐蚀损伤的演变。将开发一个模型，以评估可以在不损害容器腐蚀性能的情况下将容器壁变薄的程度。