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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. C. Chen, K. A. Moreno, Y. T. Lee, J. J. Wu, A. Q. L. Nguyen, H. Huang, K. Sequoia, A. Nikroo
Fusion Science and Technology | Volume 59 | Number 1 | January 2011 | Pages 8-13
Technical Paper | Nineteenth Target Fabrication Meeting | doi.org/10.13182/FST59-8-13
Articles are hosted by Taylor and Francis Online.
The National Ignition Tuning Campaign involves a dozen capsule designs. These capsule designs vary in diameters, layer thicknesses, and germanium doping levels, examining implosion velocity, entropy, hot-spot shape, mix, and uncertainty. Overall yield of these tuning capsules involves meeting all individual specifications, including layer thicknesses, doping levels, outer surface smoothness, and inner diameter. The yield of scaled tuning capsules with acceptable inner diameters is greatly affected by the available mandrel diameter and its size distribution.Surface low mode and isolated defect specifications have been tightened. The new specification allows smaller and fewer isolated defects. The surface specification is quantified in terms of low mode factors, peak velocity root-mean-square (PVRMS), mix mass, and ignition threshold function (ITF). The total mix mass from all isolated defects should be <40 ng, and the PVRMS value should be <10 m. While most current capsules meet the PVRMS requirement, only some tuning capsules have a mix mass <40 ng. The majority of capsules have a mix mass >40 ng, caused by a few larger domes. The ITF is related to isolated defects and capsule power spectra. Some capsules exceed the ITF specification value of 1.3.