A methodology for corrosion testing ODS steels in liquid tin under reactor conditions in HFIR

Russell, Nick G.; Romedenne, Marie; Jun, Jiheon; Pint, Bruce A.; Kondo, Masatoshi; On, Cansu; Katoh, Yutai

doi:10.1016/j.fusengdes.2025.115504

Title: A methodology for corrosion testing ODS steels in liquid tin under reactor conditions in HFIR

Journal Article · Fri Oct 31 00:00:00 UTC 2025 · Fusion Engineering and Design

DOI: https://doi.org/10.1016/j.fusengdes.2025.115504 · OSTI ID:3001769

^[1];

^[2]; On, Cansu ^[1];

^[1]

Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Institute of Science Tokyo (Japan)

Liquid metal–based divertor concepts have promising attributes for application in fusion reactors. Liquid tin is being considered as one of those liquid metals due to its excellent thermophysical properties. However, tin is extremely corrosive to steels at elevated temperatures, and the coupled effects of corrosion with neutron irradiation for application in fusion reactors have not been quantified. Researchers at Oak Ridge National Laboratory (ORNL) have designed and irradiated a series of capsules in the High Flux Isotope Reactor (HFIR) to help address gaps in the literature with respect to coupled corrosion and neutron irradiation effects. The capsules are filled with solid tin designed to melt due to the gamma heating in HFIR and allow interaction with the specimens. The capsules contain a SiC thermometer for post-irradiation temperature verification. Five capsules were irradiated in HFIR for 10.5 days, accumulating 0.93 dpa in the FeCrAl specimens. Post-irradiation temperature verification was performed on the SiC thermometers, and temperatures were observed to be higher than what was expected from thermal models. An explanation for the model underprediction is given herein. In conclusion, the capsules described within this article are the first to irradiate liquid metal within the HFIR flux trap and demonstrated the safety basis for continued liquid coolant studies in HFIR.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 3001769

Journal Information:: Fusion Engineering and Design, Journal Name: Fusion Engineering and Design Vol. 222; ISSN 0920-3796

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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