Tritium migration to the surfaces of Type 316 stainless steel; aluminum 6061; and oxygen-free, high-conductivity copper

Sharpe, M.; Shmayda, W. T.; Schroder, W. U.

doi:10.13182/FST15-198

Title: Tritium migration to the surfaces of Type 316 stainless steel; aluminum 6061; and oxygen-free, high-conductivity copper

Journal Article · Wed May 25 00:00:00 EDT 2016 · Fusion Science and Technology

DOI:https://doi.org/10.13182/FST15-198· OSTI ID:1255755

Sharpe, M. ^[1]; Shmayda, W. T. ^[1]; Schroder, W. U. ^[1]

Univ. of Rochester, Rochester, NY (United States)

The migration of tritium to the surfaces of aluminum 6061, oxygen-free, high-conductivity copper (OFHC), and stainless-steel 316 from the bulk metal was studied using low-pressure Tonks–Langmuir argon plasma. The plasma is shown to be effective at removing tritium from metal surfaces in a controlled manner. Tritium is removed in decreasing quantities with successive plasma exposures, which suggests a depletion of the surface and near-surface tritium inventories. A diffusion model was developed to predict tritium migration from the bulk and its accumulation in the water layers present on the metal surface. The model reproduces the rate of tritium re-growth on the surface for all three metals and can be used to calculate the triton solubility in the water layers present on metal surfaces. The ratio of surface-to-bulk solubilities at the water-layer/bulk-metal interface uniquely determines the concentration ratio between these two media. Removing the tritium-rich water layers induces tritium to migrate from the bulk to the surface. Furthermore, this process is driven by a concentration gradient that develops in the bulk because of the perturbation on the surface.

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Research Organization:: Univ. of Rochester, NY (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: NA0001944

OSTI ID:: 1255755

Journal Information:: Fusion Science and Technology, Vol. 70, Issue 1; ISSN 1536-1055

Publisher:: American Nuclear SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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