ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Division Spotlight
Aerospace Nuclear Science & Technology
Organized to promote the advancement of knowledge in the use of nuclear science and technologies in the aerospace application. Specialized nuclear-based technologies and applications are needed to advance the state-of-the-art in aerospace design, engineering and operations to explore planetary bodies in our solar system and beyond, plus enhance the safety of air travel, especially high speed air travel. Areas of interest will include but are not limited to the creation of nuclear-based power and propulsion systems, multifunctional materials to protect humans and electronic components from atmospheric, space, and nuclear power system radiation, human factor strategies for the safety and reliable operation of nuclear power and propulsion plants by non-specialized personnel and more.
Meeting Spotlight
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.
John Sorensen
Nuclear Technology | Volume 83 | Number 3 | December 1988 | Pages 383-395
Technical Paper | Fifth International Retran Meeting / Heat Transfer and Fluid Flow | doi.org/10.13182/NT88-A34151
Articles are hosted by Taylor and Francis Online.
The possibility of instabilities under certain conditions of operation has been a special concern for boiling water reactors (BWRs). A stability analysis is performed to demonstrate that the total system and its primary components are inherently stable over the allowable operating envelope. The current methodology used by BWR fuel vendors for core reactivity and channel hydrodynamic stability is based on frequency domain analysis. RETRAN is the Electric Power Research Institute time domain system transient analysis code that is widely used by domestic and foreign utilities. RETRAN allows the reactor system to be modeled in a highly accurate manner including all important phenomena (linear and nonlinear) associated with anticipated and unforeseen conditions of operation. RETRAN is demonstrated to be adequate for the analysis of total plant stability, core reactivity stability, and channel hydrodynamic stability. All key phenomena are adequately modeled by RETRAN and core reactivity analyses have been shown to agree well with measured plant data.
