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Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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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.
Keiji Miyazaki, Kensuke Konishi, Hiroshi Aoyama, Shoji Inoue, Nobuo Yamaoka
Fusion Science and Technology | Volume 19 | Number 3 | May 1991 | Pages 961-968
Blanket Technology | doi.org/10.13182/FST91-A29467
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For reducing the liquid metal MHD pressure drop in the inlet and outlet pipings of a fusion power reactor, the authors proposed a circular duct of electrically insulating function which consists of an outer pipe of metal structure and an inner pipe of insulating ceramics. A basic experiment was made with NaK. The test section which was made of a 25.4 mm O.D. 2.1 mm thick 304-SS pipe and a concentrically inserted 20 mm O.D., 1.0 mm thick FRP pipe with 0.6 mm clearance filled with NaK. The results are quite encouraging as summarized below. (1) The MHD drop gradient is proportional to the flow velocity U and the magnetic flux density B (c.f. B2 for a conducting duct). (2) It is 1.6 times larger than the Shercliff's theory for perfect insulation. (3) It is reduced down to 4.6% at B= 1.0 T and to 3.2% at B= 1.5 T in comparison with the case of uninsulated duct, and to less than 1% if merely extended to B= 5 T or higher.