Tritium and dust source term inventory evaluation issues in the European DEMO reactor concepts

Mazzini, Guido; Kaliatka, Tadas; Porfiri, M.T.

doi:10.1016/j.fusengdes.2019.01.008

Cited by 13 publications

(6 citation statements)

References 6 publications

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“…The tritium coverage at steady-state is ≈0.9 leading to E des ≈ 1.0 eV. With such a high coverage, there is not enough adsorption sites available for the sticking flux ∝(1 − θ) 2 to compensate the desorption flux ∝θ 2 : it prevents the desorption energy to decrease further.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Assuming this is an elementary process, the speed of this reaction is proportional to the square of the concentration of S free , i.e. (1 − θ) 2 .…”

Section: Model Of Adsorption and Desorption Of Hydrogen On W Surfacesmentioning

confidence: 99%

“…In this model, the sticking rate of molecules from the gas phase to the surface is chosen to be proportional to (1 − θ) 2 based on the reaction involved in the sticking event. However, one could choose to change this model to have a linear dependence on (1 − θ) (see Alnot [23]) or even no dependence at all.…”

Section: Model For the Sticking Of Hydrogen Isotope Moleculesmentioning

confidence: 99%

“…In ITER, both Tungsten (W) and Beryllium (Be) dust are expected [1] in the 100 kg range. In DEMO, where W is the main plasma facing material, W dust are expected in the 1000 kg/year range [2].…”

Section: Introductionmentioning

confidence: 99%

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Modelling tritium adsorption and desorption from tungsten dust particles with a surface kinetic model

et al. 2021

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A kinetic surface model is presented and used to explain the loading and desorption kinetics of tritium retained in micrometre-sized tungsten (W) dust particles. The model describes the sticking of hydrogen isotopes from the gas phase to W surfaces and the desorption from W surfaces. The initial sticking coefficient is set to one and independent of the temperature. The activation energy for desorption depends on the hydrogen coverage of the surface and is parametrised with density functional theory (DFT) calculations for W(100), W(110) and W(111) surfaces. The DFT-parametrised model is successfully compared to experimental results showing that the amount of measured tritium as well as the desorption kinetic can be modelled with only tritium adsorbed on the surface of W dust particles. Then, the model is used to explore possible scenarios to remove the tritium from the W surfaces by exposing the tritiated surfaces to either deuterium and hydrogen. The simulations suggest that it can be possible to remove all the tritium trapped on the W surfaces even at room temperature as soon as the hydrogen or deuterium pressure is higher than the tritium pressure. This gives opportunity to build tritium removal scenarios for ITER.

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Section: Simulation Resultsmentioning

confidence: 99%

“…Assuming this is an elementary process, the speed of this reaction is proportional to the square of the concentration of S free , i.e. (1 − θ) 2 .…”

Section: Model Of Adsorption and Desorption Of Hydrogen On W Surfacesmentioning

confidence: 99%

Section: Model For the Sticking Of Hydrogen Isotope Moleculesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modelling tritium adsorption and desorption from tungsten dust particles with a surface kinetic model

et al. 2021

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“…However, it should be considered that the reaction between steam and tungsten dust deposited on the FW surface and on the divertor surface has not been considered in this simulation. Moreover, it is supposed that about 671.0 g of mobilizable tritium [16], present as source term in VV, can chemically react with the catalytic layer of the PARs.…”

Section: Vv-vvpss Melcor Modelmentioning

confidence: 99%

Hydrogen explosion mitigation in DEMO vacuum vessel pressure suppression system using passive recombiners

Mazzini

D’Onorio

Caruso

2021

Fusion Engineering and Design

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Numerical analysis of supersonic jet flow and dust transport induced by air ingress in a fusion reactor

et al. 2021

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Tritium and dust source term inventory evaluation issues in the European DEMO reactor concepts

Cited by 13 publications

References 6 publications

Modelling tritium adsorption and desorption from tungsten dust particles with a surface kinetic model

Modelling tritium adsorption and desorption from tungsten dust particles with a surface kinetic model

Hydrogen explosion mitigation in DEMO vacuum vessel pressure suppression system using passive recombiners

Numerical analysis of supersonic jet flow and dust transport induced by air ingress in a fusion reactor

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