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Conference Poster Year : 2020

Tritium diagnostics for in situ inventory and waste management

Abstract

Thermonuclear reactors will operate with a D-T fuel mixture leading to tritium (T) trapping in materials. During the lifetime of the device, the in-situ measurements of the T inventory in plasma facing components is mandatory, due to safety limits on T inventory. In that frame, it is important to have an accurate measurement of the quantity of trapped T within the studied material. The development/upgrade of T diagnostics is one of the targets of the H2020/TRANSAT project (http://transat-h2020.eu/). Three tritium detection techniques are being considered within the TRANSAT. A new nuclear reaction analysis (NRA) method is being developed to measure T trapped in materials to depths of a few micrometers. It relies on the detection of products (d, p) from the nuclear reaction between 3He and T. First measurements by 3He beam with energies from 0.7 MeV to 5 MeV on T2 gas loaded W sample pre-irradiated by 20 MeV W ions show a small but measurable signal around 7.5 MeV increasing with 3He impact energy. Additional measurements and an evaluation of the cross section will be performed. Such new technique will enable simultaneous detection of D/T in materials. With the autoradiography, we are testing a new type of auto-radiographic camera based upon SiPM detectors connected with solid scintillators. We have successfully measured T on a solid surface with emerging activities as low as 67 Bq/mm2 (exposure time of 5’). We will also show how the autoradiography coupled with an accurate erosion technique (depth resolution < 100 nm) can be used to address the T depth profile in tritiated samples. The laser induced breakdown spectrometry (LIBS) development relies on picosecond laser interaction with matter allowing measuring the T inventory and its profile concentration in material. Low level T wastes are targeted. Preliminary experimental results will be presented in this contribution.
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Dates and versions

cea-04484054 , version 1 (29-02-2024)

Identifiers

  • HAL Id : cea-04484054 , version 1

Cite

Sabina Markelj, Matej Lipoglavsek, Aleksandra Cvetinović, Mickael Payet, Arnaud Bultel, et al.. Tritium diagnostics for in situ inventory and waste management. SOFT2020 - 31st Symposium on Fusion Technology, Sep 2020, Dubrovnik (virtual event), Croatia. , 2020. ⟨cea-04484054⟩
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