Dependence of Tritium Release from Stainless Steel on Temperature and Water Vapor

Shmayda, W. T.; Sharpe, M.; Boyce, A. M.; Shea, R.; Petroski, B.; Schroeder, W. U.

doi:10.13182/FST14-913

Dependence of Tritium Release from Stainless Steel on Temperature and Water Vapor

Journal Article · Tue Sep 15 00:00:00 EDT 2015 · Fusion Science and Technology

DOI:https://doi.org/10.13182/FST14-913· OSTI ID:1223346

Shmayda, W. T. ^[1]; Sharpe, M. ^[2]; Boyce, A. M. ^[2]; Shea, R. ^[2]; Petroski, B. ^[2]; Schroeder, W. U. ^[3]

Univ. of Rochester, NY (United States). Lab. for Laser Energetics; Laboratory for Laser Energetics, University of Rochester, Rochester, NY
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Univ. of Rochester, NY (United States)

The impact of water vapor and temperature on the release of tritium from stainless steel was studied. Degreased stainless steel samples loaded with tritium at room temperature following a 24-h degassing in vacuum at room temperature were subjected to increasing temperatures or humidity. In general, increasing either the sample temperature or the humidity causes an increased quantity of tritium to be removed. Increasing the temperature to 300°C in a dry gas stream results in a significant release of tritium and is therefore an effective means for reducing the tritium inventory in steel. For humid purges at 30°C, a sixfold increase in humidity results in a tenfold increase in the peak outgassing rate. Increasing the humidity from 4 parts per million (ppm) to 1000 ppm when the sample temperature is 100°C causes a significant increase in the tritium outgassing rate. Finally, a simple calculation shows that only 15% of the activity present in the sample was removed in these experiments, suggesting that the surface layer of adsorbed water participates in regulating tritium desorption from the surface.

View Accepted Manuscript (DOE)

Research Organization:: University of Rochester, Rochester, NY (United States). Laboratory for Laser Energetics

Sponsoring Organization:: USDOE

Grant/Contract Number:: NA0001944

OSTI ID:: 1223346

Journal Information:: Fusion Science and Technology, Journal Name: Fusion Science and Technology Journal Issue: 4 Vol. 68; ISSN 1536-1055

Publisher:: American Nuclear SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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