Tritium release kinetics from Li

S. Casadio, J.G. Van Der Laan, C. Alvani, A.J. Magielsen, M.P. Stijkel

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Abstract

Lithium meta titanate pebbles has been prepared from agglomeration- sintering powders which were obtained by Li-Ti-peroxo-complex solution precursor (Li2TiO3dissolved at room temperature in H2O+40% H2O2and stabilized with citric acid). Through this wet route Li2TiO3pebbles with high density(∼92% of T.D.) has been obtained and the tritium release behavior has been tested 'in-pile' by the EXOTIC-8.9 experiment (∼440 days of irradiation at full power in the high neutron flux of HFR-Petten). Tritium residence times (τ) in the pebbles has been measured during irradiation between 550 and 400 °C and He+0.1%H2purge gas composition. By a thermally activated process (activation energy=111 kJ/mol) with 410 °C as minimum temperature the tritium residence time is found to be about 1 day, which places this specimen in a good ranking position among those tested by the EXOTIC-series. A clear increase of the tritium release rate has been observed by increased H2concentration (up to 1%) in the He purge. Out-of-pile ramp-annealing tritium desorption (TPD) tests on short-time irradiated pebbles has been also performed by various devices and conditions. The kinetic parameters from the TPD investigation gave consistent results with those characterizing the equilibrium times of tritium release rate after the gas composition and temperature transients imposed on the specimen during the in-pile experiment. Published by Elsevier B.V.
Original languageEnglish
Pages (from-to)1252 - 1255
Number of pages4
JournalJournal of Nuclear Materials
Volume329-333
Issue number1-3 PART B
DOIs
Publication statusPublished - 1 Aug 2004
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials

Cite this

Casadio, S., Van Der Laan, J. G., Alvani, C., Magielsen, A. J., & Stijkel, M. P. (2004). Tritium release kinetics from Li. Journal of Nuclear Materials, 329-333(1-3 PART B), 1252 - 1255. https://doi.org/10.1016/j.jnucmat.2004.04.237