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
Fuel Cycle & Waste Management
Devoted to all aspects of the nuclear fuel cycle including waste management, worldwide. Division specific areas of interest and involvement include uranium conversion and enrichment; fuel fabrication, management (in-core and ex-core) and recycle; transportation; safeguards; high-level, low-level and mixed waste management and disposal; public policy and program management; decontamination and decommissioning environmental restoration; and excess weapons materials disposition.
Meeting Spotlight
2024 ANS Annual Conference
June 16–19, 2024
Las Vegas, NV|Mandalay Bay Resort and Casino
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
May 2024
Jan 2024
Latest Journal Issues
Nuclear Science and Engineering
June 2024
Nuclear Technology
Fusion Science and Technology
Latest News
Proving DRACO will deliver
The United States is now closer than it has been in over five decades to launching the first nuclear thermal rocket into space, thanks to DRACO—the Demonstration Rocket for Agile Cislunar Orbit.
Rafael Macian, Peter Cebull, Paul Coddington, Mark Paulsen
Nuclear Technology | Volume 128 | Number 2 | November 1999 | Pages 139-152
Technical Paper | RETRAN | doi.org/10.13182/NT99-A3021
Articles are hosted by Taylor and Francis Online.
RETRAN-3D-MOD002.0 includes a five-equation flow field model to extend the code's analytical capabilities to situations in which thermodynamic nonequilibrium phenomena are important. Evaluation of this model's performance against several depressurization and repressurization transients has shown severe numerical and convergence problems related to the calculation of the interfacial energy and mass transfer. To remove these code limitations, a new interfacial mass and energy transfer model has been developed and implemented in RETRAN-3D. This model calculates the phase change based on the net heat transfer to the liquid-vapor interface at saturation. The heat transfer for each phase is equal to the product of the interfacial area density, a heat transfer coefficient, and the difference between the interface and the bulk temperature of the respective phase. A flow regime map based on the work of Taitel and Dukler is used to identify the flow regime in a control volume and to select the appropriate correlations for these quantities.Assessment of the new model's performance includes the simulation of an experimental depressurization transient, OMEGA test 9; a turbine trip transient in a BWR/4; and a very fast depressurization transient, the Edwards pipe problem. The results are free from the previous numerical problems and show a good agreement with experimental values.