|About this Abstract
||Materials Science & Technology 2019
||Late News Poster Session
||P3-72: Corrosion Performance of Alloyed Nuclear Waste Form
||Vineeth Kumar Gattu, William Ebert, J Ernesto Indacochea
|On-Site Speaker (Planned)
||Vineeth Kumar Gattu
Metallic waste forms are made by alloying metallic fuel waste that remains after electrochemical processing of spent nuclear fuel with cladding hulls, contaminated hardware, and added trim metals. Understanding the corrosion mechanisms of radionuclide-bearing host phases provides the scientific basis needed for modeling long-term performance. We performed electrochemical corrosion tests with surrogate alloy waste forms to characterize the corrosion behaviors and kinetics as alloy surfaces stabilized (or corroded) under fixed Eh-pH conditions. Alloy surfaces were characterized before and after electrochemical tests to identify corroded phases and solutions were analyzed to relate corrosion currents to elemental releases. Analytical functions were derived to represent the Eh and pH dependencies of the corrosion rates for degradation modelling. Equivalent circuit models were used to represent passivated surfaces and provide confidence in using the measured electrochemical kinetics to model long-term waste form performance. Representative results will be used to demonstrate the approach.