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Decommissioning & Environmental Sciences
The mission of the Decommissioning and Environmental Sciences (DES) Division is to promote the development and use of those skills and technologies associated with the use of nuclear energy and the optimal management and stewardship of the environment, sustainable development, decommissioning, remediation, reutilization, and long-term surveillance and maintenance of nuclear-related installations, and sites. The target audience for this effort is the membership of the Division, the Society, and the public at large.
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ANS Student Conference 2025
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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.
A. Isaev, J. Felbinger, C. Evrim, R. Kulenovic, E. Laurien (Univ of Stuttgart)
Proceedings | 2018 International Congress on Advances in Nuclear Power Plants (ICAPP 2018) | Charlotte, NC, April 8-11, 2018 | Pages 325-334
Turbulent and stratified mixing flows can cause thermal fatigue in nuclear power plant piping systems. In order to diminish the investigation effort of thermal mixing flow phenomena, a geometrically similar isothermal Mixed Fluid Interaction (MFI) mixing tee using a sodium chloride solution to model the cold heavy branch pipe fluid is built. The purpose of the MFI experiments is to predict the flow phenomena in the vertical thermal mixing Fluid Structure Interaction (FSI) T-junction configuration at the University of Stuttgart. Due to limited optical accessibility of the FSI facility a numerical similarity comparison of the flow phenomena occurring in both experimental setups (MFI/FSI) is essential. Thus, Large Eddy Simulations are carried out which are experimentally validated by applying the Particle Image Velocimetry and Planar Laser Induced Fluorescence measurement techniques and as well as benchmark data. The similarity investigation confirms the usage of three characterizing parameters for the adaption of relevant physical boundary conditions to the FSI setup (branch pipe Reynolds number (??????), mixing Richardson number (????) and momentum ratio (????)). Thereby, the evidenced similarity ensures the utilization of the cold mixing experimental setup for the visual prediction of flow patterns occurring in the hot mixing FSI facility.