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Deep geologic repository progress—2025 Update
Editor's note: This article has was originally published in November 2023. It has been updated with new information as of June 2025.
Outside my office, there is a display case filled with rock samples from all over the world. It contains a disk of translucent, orange salt from the Waste Isolation Pilot Plant near Carlsbad, N.M.; a core of white-and-bronze gneiss from the site of the future deep geologic repository in Eurajoki, Finland; several angular chunks of fine-grained, gray claystone from the underground research laboratory at Bure, France; and a piece of coarse-grained granite from the underground research tunnel in Daejeon, South Korea.
Thanh Q. Hua, Basil F. Picologlou
Fusion Science and Technology | Volume 19 | Number 1 | January 1991 | Pages 102-112
Technical Paper | Blanket Engineering | doi.org/10.13182/FST91-A29320
Articles are hosted by Taylor and Francis Online.
The magnetohydrodynamic flow of a liquid metal through a manifold that feeds an array of electrically coupled rectangular ducts with thin conducting walls is investigated. This geometry is typical of an inlet/outlet manifold servicing arrays of poloidal coolant channels in tokamak self-cooled blankets. The interaction parameter and Hartmann number are assumed to be large, whereas the magnetic Reynolds number is assumed to be small. Under these assumptions, which are relevant to liquid-metal flows in self-cooled tokamak blankets, viscous and inertial effects are confined to very thin boundary layers adjacent to the walls. The analysis for obtaining three-dimensional solutions outside these layers is described, and numerical solutions are presented. Electrical coupling between the common manifold and the coolant ducts, as well as coupling among the coolant ducts themselves, necessitates simultaneous solutions for the multiple channels, and uniquely determines the partition of the total flow rate among the coolant ducts. Control of flow partition that may be required for optimal cooling of the first wall and blanket is demonstrated and discussed. The pressure drop resulting from the disturbance associated with the manifold is calculated and is shown to be minimal.