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Self-Accelerated Corrosion of Nuclear Waste Forms at Material Interfaces-The 21st China(Guangzhou)Int'l Stainless Steel Industry Exhibition
3/2/2020 - Stainless Steel Exhibition |
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A new study by researchers at Ohio State University suggests that stainless steel may not be the best choice for containing high-level nuclear waste. By simulating long-term storage conditions, the team found that the storage materials interact with each other more than previously thought, causing them to degrade faster. In a research paper published in NatureMaterial, they said “The US plan for high-level nuclear waste includes the immobilization of long-lived radionuclides in glass or ceramic waste forms in stainless-steel canisters for disposal in deep geological repositories. Here we report that, under simulated repository conditions, corrosion could be significantly accelerated at the interfaces of different barrier materials, which has not been considered in the current safety and performance assessment models. Severe localized corrosion was found at the interfaces between stainless steel and a model nuclear waste glass and between stainless steel and a ceramic waste form. The accelerated corrosion can be attributed to changes of solution chemistry and local acidity/alkalinity within a confined space, which significantly alter the corrosion of both the waste-form materials and the metallic canisters. The corrosion that is accelerated by the interface interaction between dissimilar materials could profoundly impact the service life of the nuclear waste packages, which, therefore, should be carefully considered when evaluating the performance of waste forms and their packages. Moreover, compatible barriers should be selected to further optimize the performance of the geological repository system.
The storage of nuclear waste is more than a perennial political football, it is an existential problem. Whatever one''s opinions about nuclear power or weapons, there are thousands of tons of nuclear waste temporarily stored around the world, meaning that a way must be found to store it all safely in the long term. The most important type of nuclear waste is the high-level waste left over from reprocessing nuclear fuel or from nuclear weapon production. Such waste is made up of a complex mixture of radioactive isotopes with half-lives ranging from years to millennia. Though reactors have been operating all over the world for over 75 years, only Finland has started to build a permanent storage facility for such very dangerous waste.
不锈钢展-2020第二十一届广州国际不锈钢工业展-效果最好的不锈钢展会-The 21st China(Guangzhou)Int''l Stainless Steel Industry Exhibition
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