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Performance of a hydrogen sensor in Pb–16Li

Authors
Journal
Journal of Nuclear Materials
0022-3115
Publisher
Elsevier
Publication Date
Identifiers
DOI: 10.1016/j.jnucmat.2007.03.250
Disciplines
  • Mathematics

Abstract

Abstract To develop a sensor for measurements of hydrogen (and its isotopes) concentration in liquid Pb–16Li, two permeating capsules made with niobium and pure iron have been tested. The experimental results demonstrated that the Nb-sensor is not suitable for the foreseen application. The Fe-sensor cannot be operated in equilibrium mode because of the very long time necessary to reach the hydrogen pressure equilibrium. However, the equilibrium mode cannot be definitively excluded. In fact, by means of a substantial optimisation of the sensor geometry, the pressurisation rate could be fast enough to reach acceptable response times. In this context, different optimised solutions have been developed and good performance demonstrated by simulations. The present Fe-sensor can be successfully operated in dynamic mode, since it is possible to link reliably the permeation fluxes to the hydrogen concentration in the liquid metal.

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