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Title: Vacuum Permeator Analysis for Extraction of Tritium from DCLL Blankets

It is envisioned that tritium will be extracted from DCLL blankets using a vacuum permeator. We derive here an analytical solution for the extraction efficiency of a permeator tube, which is a function of only two dimensionless numbers: one that indicates whether radial transport is limited in the PbLi or in the solid membrane, and another that is the ratio of axial and radial transport times in the PbLi. The permeator efficiency is maximized by decreasing the velocity and tube diameter, and increasing the tube length. This is true regardless of the mass transport correlation used; we review several here and find that they differ little, and the choice of correlation is not a source of significant uncertainty here. The PbLi solubility, on the other hand, is a large source of uncertainty, and we identify upper and lower bounds from the literature data. Under the most optimistic assumptions, we find that a ferritic steel permeator operating at 550 °C will need to be at least an order of magnitude larger in volume than previous conceptual designs using niobium and operating at higher temperatures.
 [1] ;  [1]
  1. Idaho National Laboratory
Publication Date:
OSTI Identifier:
Report Number(s):
DOE Contract Number:
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Resource Relation:
Conference: Technology of Fusion Energy, Anaheim, CA, 11/10/2014 - 11/13/2014
Research Org:
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
DCLL; Lead Lithium; Tritium Extraction; Vacuum Permeator