Radionuclide tracing based in situ corrosion and mass transport monitoring of 316L stainless steel in a molten salt closed loop

Yafei Wang (), Aeli P. Olson, Cody Falconer, Brian Kelleher, Ivan Mitchell, Hongliang Zhang, Kumar Sridharan, Jonathan W. Engle and Adrien Couet
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Yafei Wang: University of Wisconsin-Madison
Aeli P. Olson: University of Wisconsin-Madison
Cody Falconer: University of Wisconsin-Madison
Brian Kelleher: TerraPower, LLC
Ivan Mitchell: TerraPower, LLC
Hongliang Zhang: University of Wisconsin-Madison
Kumar Sridharan: University of Wisconsin-Madison
Jonathan W. Engle: University of Wisconsin-Madison
Adrien Couet: University of Wisconsin-Madison

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract In the study, we report an in situ corrosion and mass transport monitoring method developed using a radionuclide tracing technique for the corrosion study of 316L stainless steel (316L SS) in a NaCl–MgCl2 eutectic molten salt natural circulation loop. This method involves cyclotron irradiation of a small tube section with 16 MeV protons, later welds at the hot leg of the molten salt flow loop, generating radionuclides 51Cr, 52Mn, and 56Co at the salt–alloy interface. By measuring the activity variations of these radionuclides at different sections along the loop, both the in situ monitoring of the corrosion attack depth of 316L SS and corrosion product transport and its precipitation in flowing NaCl–MgCl2 molten salt are achieved. While 316L SS is the focus of this study, the technique reported herein can be extended to other structural materials being used in a wide range of industrial applications.

Date: 2024
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DOI: 10.1038/s41467-024-47259-8

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