In-pile tritium release from liquid breeder material Pb-17Li Libretto 1 experiment
Lithium-lead alloy samples, Pb-17Li with lithium in natural abundance were irradiated in closed capsules and one plenum swept capsule. The design of the irradiation facility permitted independent in-situ tritium release measurements, to study tritium permeation through the capsule walls and tritium extraction by plenum sweeping with a helium +0.1vol% hydrogen purge gas. The alloy was irradiated at NET relevant conditions. Temperature transients between 600 and 680 K were performed to study tritium release kinetics. The experimental results indicate that steady state tritium release by permeation was achieved at temperatures above 580 K. The typical in-situ tritium residence times for temperatures between 600 and 680 K ranged from 12 to 2.2 hours. The apparent diffusion coefficient of tritium in the alloy is 3.5xE-10_m2/s at 645 K. 47% of the produced tritium was extracted by plenum sweeping at temperatures >580K. Tritium was released in HT form. The data seem to show that the eutectic alloy has a very low capability to confine tritium.
Bibliographic Reference: Paper presented: 15th SOFT Conference, Utrecht (NL), Sept.19-23 1988
Availability: Available from (1) as Paper EN 34119 ORA
Record Number: 198910203 / Last updated on: 1994-12-01
Original language: en
Available languages: en