Effect of purge gas oxidizing potential on tritium release from Li-ceramics and on its permeation through 316L SS clads under irradiation (TRINE experiment)

C. Alvani

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Abstract

The effect of red-ox potential of helium purge gas (variously doped with H2, H2O and O2) was examined on tritium release from Li-ceramics (LiAlO2and Li2ZrO3pellets) and on its permeation rate through the 316L stainless steel clads (bare and coated) held at 500°C. Decreasing the H2content from 1000 vpm (reference 'R' gas mixture) to 100 vpm, and substituting H2O for H2, the tritium permeation rate (ca. 1.41010atoms cm-2s-1in R-gas) increases. Tritium inventories in the Li ceramics were increased too. When a strong oxidizing purge (1000 vpm O2added to He containing 100 vpm H2O) was used, a retention time (T) of two days at 400°C was measured for Li2ZrO3. In this oxidizing environment the tritium permeation loss dropped by a factor five for the uncoated capsules while an aluminide coating became a very effective tritium barrier: tritium permeation flux at 550°C fell below the measurable limit. Copyright © 1996 Elsevier Science B.V. All rights reserved.
Original languageEnglish
Pages (from-to)1441 - 1445
Number of pages5
JournalJournal of Nuclear Materials
Volume233-237
Issue numberPART II
DOIs
Publication statusPublished - 1996
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Materials Science(all)

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