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Division Spotlight
Thermal Hydraulics
The division provides a forum for focused technical dialogue on thermal hydraulic technology in the nuclear industry. Specifically, this will include heat transfer and fluid mechanics involved in the utilization of nuclear energy. It is intended to attract the highest quality of theoretical and experimental work to ANS, including research on basic phenomena and application to nuclear system design.
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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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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.
Yuh Ming Ferng, Yung Shin Tseng, Bau Shei Pei, S. Long Wang, Chunkuan Shih, Tsun Fu Hung
Nuclear Technology | Volume 162 | Number 3 | June 2008 | Pages 308-322
Technical Paper | Thermal Hydraulics | doi.org/10.13182/NT08-A3958
Articles are hosted by Taylor and Francis Online.
In this paper, possible influences of power uprate on the distribution characteristics of erosion-corrosion (E/C) wear sites were analyzed through proper two-phase models. These models include three-dimensional two-phase computational fluid dynamics (CFD) simulations and appropriate E/C analysis. An analytical approach was applied to boiling water reactors. Based on the simulation results, the present CFD simulations successfully predicted two-phase phenomena that occurred in the piping system including centrifugal effects, gravitational effects, an imbalance of phase and mass separation in a T-junction, etc. When coupled with the calculated two-phase flow structures, the appropriate E/C models can be used to indicate the local distributions of severe E/C wear sites on the wall of the fittings. This shows a reasonable agreement with the plant-measured results. With these models, the impacts of power uprate on the distribution characteristics of E/C wear sites can be investigated. Comparisons between the calculated results for 100, 105, and 110% power levels clearly reveal that the power uprate has an insignificant effect on the distribution characteristics of wear sites for the selected piping system under investigation, especially in the wear ranges.