Magneto-convective effect on tritium transport at breeder unit level for the WCLL breeding blanket of DEMO

Alberghi, Ciro; Candido, Luigi; Testoni, Raffaella; Utili, Marco; Zucchetti, Massimo

doi:10.1016/j.fusengdes.2020.111996

Cited by 9 publications

(6 citation statements)

References 15 publications

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“…A 3D MHD simulation of the BU including the complete pipe layout is desirable to investigate these aspects and a non-negotiable necessity to assess magneto-convective phenomena. This last topic is particularly relevant to obtain a reliable estimate of temperature distribution in the breeder [47,48], necessary to comply with the structural material requirements, and mass transport phenomena [49]. Unfortunately, these detailed analyses are also associated to an exorbitant computational cost.…”

Section: Discussionmentioning

confidence: 99%

Computational MHD analyses in support of the design of the WCLL TBM breeding zone

Tassone

Caruso

2021

Fusion Engineering and Design

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Section: Discussionmentioning

confidence: 99%

Computational MHD analyses in support of the design of the WCLL TBM breeding zone

Tassone

Caruso

2021

Fusion Engineering and Design

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“…The release term c/τ has to appear in the fluid equation as an additional source term in Equation (3). A factor of (1−ε)/2ε takes into account the solid vs. fluid volume fractions and the factor two corrects for atoms vs. molecules in the case that release is done in the form of the pure species molecule T 2 .…”

Section: Residence Time Release Modelmentioning

confidence: 99%

“…The above conditions obviously ask for multiple physics capabilities when analyses are to be done. Multiphysics component-level simulations are done for several breeder concepts using different codes, e.g., for water-cooled lithium leads (WCLL) [3,4], watercooled ceramic breeders (WCCB) [5], and helium-cooled ceramic reflectors (HCCR) [6]. For HCPB, several system-level analyses exist [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Development of a Component-Level Hydrogen Transport Model with OpenFOAM and Application to Tritium Transport Inside a DEMO HCPB Breeder

et al. 2021

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This work continues the development of a numerical model to simulate transient tritium transport on the breeder zone (BZ) level for the EU helium-cooled pebble bed (HCPB) concept for DEMO. The basis of the model is the open-source field operation and manipulation framework, OpenFOAM. The key output quantities of the model are the tritium concentration in the purge gas and in the coolant and the tritium inventory inside the BZ structure. New model features are briefly summarized. As a first relevant application a simulation of tritium transport for a single pin out of the KIT HCPB design for DEMO is presented. A variety of scenarios investigates the impact of the permeation regime (diffusion-limited vs. surface-limited), of an additional hydrogen content of 300 Pa H2 in the purge gas, of the released species (HT vs. T2), and of the choice of species-specific rate constants (recombination constant of HT set twice as for H2 and T2). The results indicate that the released species plays a minor role for permeation. Both permeation and inventory show a considerable dependence on a possible hydrogen addition in the purge gas. An enhanced HT recombination constant reduces steel T inventories and, in the diffusion-limited case, also permeation significantly. Scenarios with 80 bar vs. 2 bar purge gas pressure indicate that purge gas volumetric flow is decisive for permeation.

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“…A number of studies have been performed to address the effect of MHD on tritium transport for the WCLL blanket concept for DEMO reactor [123,124]. In particular, flow in a portion of the breeding unit, as shown in Figure 12 on the top, has been simulated adopting a novel coupling strategy for the physics involved, and differences between pure hydrodynamic (Gr = 4.78 × 10 10 , Ha = 0) and magnetohydrodynamic (Gr = 4.78 × 10 10 , B = 4 T, Ha ≈ 11,000) conditions have been highlighted.…”

Section: Wcll Demo Blanketmentioning

confidence: 99%

MHD R&D Activities for Liquid Metal Blankets

et al. 2021

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According to the most recently revised European design strategy for DEMO breeding blankets, mature concepts have been identified that require a reduced technological extrapolation towards DEMO and will be tested in ITER. In order to optimize and finalize the design of test blanket modules, a number of issues have to be better understood that are related to the magnetohydrodynamic (MHD) interactions of the liquid breeder with the strong magnetic field that confines the fusion plasma. The aim of the present paper is to describe the state of the art of the study of MHD effects coupled with other physical phenomena, such as tritium transport, corrosion and heat transfer. Both numerical and experimental approaches are discussed, as well as future requirements to achieve a reliable prediction of these processes in liquid metal blankets.

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Magneto-convective effect on tritium transport at breeder unit level for the WCLL breeding blanket of DEMO

Cited by 9 publications

References 15 publications

Computational MHD analyses in support of the design of the WCLL TBM breeding zone

Computational MHD analyses in support of the design of the WCLL TBM breeding zone

Development of a Component-Level Hydrogen Transport Model with OpenFOAM and Application to Tritium Transport Inside a DEMO HCPB Breeder

MHD R&D Activities for Liquid Metal Blankets

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