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Radiolytic corrosion of copper

铜的辐射腐蚀

基本信息

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

项目摘要

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.

目前永久处置高放核废料的管理方案是将其埋在密封的金属容器中，并埋在一个深而稳定的地质处置库中。废物容器的主要功能是将放射性废物与地下水隔离，直到放射性水平衰减到无害水平。对于目前的厚壁容器设计，容器外部的伽马辐射场对容器腐蚀的影响可以忽略不计。然而，为了克服一些制造和焊接问题，正在考虑将薄壁容器作为潜在的许可要求，重新评估伽马辐射对容器腐蚀的影响。该项目针对这一问题提出了一项研究，即在模拟处置库条件下研究辐射对腐蚀的影响，这一条件将从最初的炎热和干燥发展到温暖、通风和潮湿，最终冷却、含水和缺氧。电化学，分析和腐蚀实验的程序将被用来确定腐蚀过程的机械特性，并确定腐蚀损害的废物处置条件的演变和辐射场衰减的演变。将开发一个模型，以评估在不影响集装箱腐蚀性能的情况下，集装箱壁可以减薄的程度。