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Division Spotlight
Robotics & Remote Systems
The Mission of the Robotics and Remote Systems Division is to promote the development and application of immersive simulation, robotics, and remote systems for hazardous environments for the purpose of reducing hazardous exposure to individuals, reducing environmental hazards and reducing the cost of performing work.
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ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
Standards Program
The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
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Fusion Science and Technology
Latest News
Norway’s Halden reactor takes first step toward decommissioning
The government of Norway has granted the transfer of the Halden research reactor from the Institute for Energy Technology (IFE) to the state agency Norwegian Nuclear Decommissioning (NND). The 25-MWt Halden boiling water reactor operated from 1958 to 2018 and was used in the research of nuclear fuel, reactor internals, plant procedures and monitoring, and human factors.
K. Ida, S. Inagaki, M. Yoshinuma, N. Tamura, T. Morisaki, LHD Experiment Group
Fusion Science and Technology | Volume 58 | Number 1 | July-August 2010 | Pages 113-121
Chapter 3. Confinement and Transport | Special Issue on Large Helical Device (LHD) | doi.org/10.13182/FST10-A10798
Articles are hosted by Taylor and Francis Online.
Radial profiles of the space potential are measured at the n/m = 1/1 magnetic island produced by external perturbation coils in the Large Helical Device (LHD). Both the temperature and space potential are flat inside the magnetic island, and the large radial electric field shear appears at the boundary of the magnetic island because the radial electric field is zero inside the magnetic island. However, when the width of the magnetic island becomes large, the space potential profile becomes peaked because of the convective flow along the magnetic flux surface inside the magnetic island around the O point. The appearance of the convective flow suggests that the perpendicular viscosity is significantly reduced inside the magnetic island. The perturbation transport study using the cold-pulse propagation is a useful tool to study the transport inside the magnetic island, where the temperature gradient is zero in the steady state. Inside the magnetic island, the cold-pulse propagates slowly from the boundary toward the center, and radial profiles of the delay time are peaked at the magnetic island. The large delay time (slow pulse propagation) indicates that the thermal diffusivity is even small inside the magnetic island. These experimental results indicate that the heat and momentum transport are significantly improved inside the magnetic island although the temperature and flow gradients are zero due to the lack of heat and momentum fluxes.