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
Nuclear Installations Safety
Devoted specifically to the safety of nuclear installations and the health and safety of the public, this division seeks a better understanding of the role of safety in the design, construction and operation of nuclear installation facilities. The division also promotes engineering and scientific technology advancement associated with the safety of such facilities.
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!
Latest Magazine Issues
Apr 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
May 2025
Nuclear Technology
April 2025
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.
Hyoung Tae Kim, Hee Cheon No
Nuclear Technology | Volume 119 | Number 1 | July 1997 | Pages 98-104
Technical Note | Heat Transfer and Fluid Flow | doi.org/10.13182/NT77-A35397
Articles are hosted by Taylor and Francis Online.
The improvement of RELAP5/MOD3.1 code predictive capability for steam condensation on an inclined surface is investigated. In modeling the secondary condensers with RELAP5, two problems were encountered with respect to condensation in vertically stacked tube walls: the capability for turbulent film condensation and the effect of the wall node size on the prediction of condensation heat transfer coefficients (HTCs). The code original model based on the Nus-selt model for laminar film condensation is extended to the turbulent film condensation by introducing two previously developed models into the code. The code is further improved to properly take into account the condensation length over many nodings. To eliminate the dependence on the node size in predicting the condensation HTC of the code, film Reynolds numbers at each node are calculated recursively to track the growing condensate film thickness along the condensation length. The modified version is tested under idealized boundary conditions and with the simulation of secondary condensers and is compared with an analytical solution and the original code. It turns out that the simulation results by this modified version are independent of the node size and are in better agreement with the analytical solution than those by the original one.