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research article

Compact fusion blanket using plasma facing liquid Li-LiH walls and Pb pebbles

Ogier-Collin, Sabine  
October 1, 2024
Journal of Nuclear Materials

Liquid plasma facing walls allow for increased neutron-wall loading expanding the design space of fusion power-plants and experimental devices towards compact high-field reactors. This study presents the design of a compact radial build blanket for fusion devices composed of variable quantities of Lead (Pb) and Lithium-Lithium Hydride (Li-LiH). A tank-like cylindrical neutronic model of the early design of the stellarator reactor proposed by Renaissance Fusion is implemented in OpenMC (neutron transport and dose rate analyses). The reactor's radial build composition and blanket layer thicknesses are varied to fulfill the requirements on tritium breeding ratio (TBR), nuclear heat extraction, radiation shielding (for the coils, internal structures and external environment) for a stellarator-based power-plant. The analyses suggest that a radial build lower than a meter thick between the plasma and coils would be sufficient to allow for a TBR ∼ 1.60, an energy multiplication factor of ∼ 1.07, to capture ≥ 90% of the nuclear heat, limit the neutron fluence at the coils below 1019 n/cm2, and limit the structural damage on the liquid metal vessel and magnet structure. In particular, a blanket composed of 32 cm of Pb and Li-LiH, 54 cm of a heavy metal hydride such as vanadium hydride (VH2), along with a 1.3 m of concrete bioshield, would minimize the radial build of the stellarator reactor while fulfilling tritium breeding, shielding and heat extraction requirements.

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Type
research article
DOI
10.1016/j.jnucmat.2024.155239
Scopus ID

2-s2.0-85197035994

Author(s)
Ogier-Collin, Sabine  

École Polytechnique Fédérale de Lausanne

Date Issued

2024-10-01

Published in
Journal of Nuclear Materials
Volume

599

Article Number

155239

Subjects

Blanket

•

Liquid metal

•

Neutronics

•

OpenMC

•

Pebbles

•

TBR

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
EPFL  
Available on Infoscience
July 8, 2025
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/252000
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