- Columbus, Ohio, United States
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Recent advancements in fiber optic manufacturing, sensor design, and fiber optic interrogators have provided significant opportunities towards the development of cross-cutting fiber optic sensing solutions across the nuclear industry. The... more
Recent advancements in fiber optic manufacturing, sensor design, and fiber optic interrogators have provided significant opportunities towards the development of cross-cutting fiber optic sensing solutions across the nuclear industry. The addressable harsh nuclear environment markets include Gen II, II+ and IV nuclear reactors, fusion reactors, and accelerator systems. In this work the authors present a series of developments towards the implementation of singlefiber, multipoint, temperature and pressure sensors, test results in high-temperature and high-radiation environments, cryogenic environments, material compatibility studies for sensor packaging, and future development needs to address technical challenges towards sensor commercialization.
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Abstract The study investigates the effects of diffusion coating by boronization on the corrosion behavior of IN718 and C276 in molten KCl-MgCl2-NaCl salt at 800 °C. The boride layer was uniform and non-porous comprising of an outermost... more
Abstract The study investigates the effects of diffusion coating by boronization on the corrosion behavior of IN718 and C276 in molten KCl-MgCl2-NaCl salt at 800 °C. The boride layer was uniform and non-porous comprising of an outermost (nickel-silicide and metal-borides) layer, the middle "compound" (metal-borides), and inner "dispersed" or "diffusion" layer (intermixture of metal-borides). Both the boronized alloys exhibited better corrosion resistance. The average mass-loss (mg/cm2) was in the increasing order of boronized C276
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In this study, a graphite rotating disc electrode was successfully designed and applied to conduct electrochemical measurements under flow conditions in molten LiCl-KCl at 773 K. The concentration and diffusion coefficients of Eu3+ and... more
In this study, a graphite rotating disc electrode was successfully designed and applied to conduct electrochemical measurements under flow conditions in molten LiCl-KCl at 773 K. The concentration and diffusion coefficients of Eu3+ and Eu2+ in molten salt were quantitatively measured with this electrode by applying in situ cyclic voltammetry and chronoamperometry techniques. The initial concentration ratio of Eu3+/Eu2+ in LiCl-KCl-0.5 wt% EuCl3 was calculated to be 2.37. The calculated diffusion coefficients of Eu3+ and Eu2+ in the salt were 9.31 ± 0.06 × 10−5 cm2 s−1 and 9.65 ± 0.6 × 10−5 cm2 s−1, respectively. A decrease of the diffusion coefficient of Eu3+ and Eu2+ was observed at a higher concentration of EuCl3, which implies the enhanced Eu-Eu ion interaction. This electrode design is expected to be utilized for the concentration measurement of multivalent ions in a flowing molten salt.
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ABSTRACT The impurity-driven corrosion behavior of HAYNES® 230® alloy in the molten KCl-MgCl2-NaCl salt was studied at 800 °C for 100 hours with different salt purity conditions. It was found that HAYNES® 230® alloy exhibited better... more
ABSTRACT The impurity-driven corrosion behavior of HAYNES® 230® alloy in the molten KCl-MgCl2-NaCl salt was studied at 800 °C for 100 hours with different salt purity conditions. It was found that HAYNES® 230® alloy exhibited better corrosion resistance in the salt with lower impurities. Furthermore, the corrosion (non-immersion) due to molten salt vapors was more severe at higher temperature. The attack was localized and driven by outward diffusion of chromium through the grain boundaries. The presence of Mg in its metal form in the salt resulted in an even higher mass-loss in HAYNES® 230® alloy due to Mg-Ni interaction.