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ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
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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. J. Caspary, B. E. Chapman, S. P. Oliva, S. T. A. Kumar
Fusion Science and Technology | Volume 62 | Number 3 | November 2012 | Pages 375-378
Technical Paper | doi.org/10.13182/FST12-A15336
Articles are hosted by Taylor and Francis Online.
On the Madison Symmetric Torus magnetic fusion plasma experiment, frozen pellet injection is an established method of depositing deuterium fuel into the core of the plasma. To freeze deuterium gas into pellets, the injector is cooled to 10 K with a cryogenic helium refrigerator. To exhaust residual frozen deuterium following injection of each pellet, the injector is warmed by resistive heating to >18.7 K, the triple point of deuterium. Motivated by the desire to inject carbon-containing pellets, the injector was modified to allow the freezing and injection of methane. The triple point of methane, 90.7 K, is well beyond the capability of the resistive heating hardware. To supplement the resistive heating, a small, steady flow of room-temperature helium was introduced as a heat source. The flow rate was optimized to provide minimum and maximum injector temperatures of 24 and 95 K, respectively, sufficient for methane pellet formation and exhaust. The flow rate can easily be optimized for other gases as well.