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 Criticality Safety
NCSD provides communication among nuclear criticality safety professionals through the development of standards, the evolution of training methods and materials, the presentation of technical data and procedures, and the creation of specialty publications. In these ways, the division furthers the exchange of technical information on nuclear criticality safety with the ultimate goal of promoting the safe handling of fissionable materials outside reactors.
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
Discovering, Making, and Testing New Materials: SRNL’s Center For Hierarchical Waste Form Materials
Savannah River National Laboratory researchers are building on the laboratory’s legacy of using cutting-edge science to effectively immobilize nuclear waste in innovative ways. As part of the Center for Hierarchical Waste Form Materials, SRNL is leveraging its depth of experience in radiological waste management to explore new frontiers in the industry.
Aaron M. Krueger (Texas A&M), Vincent A. Mousseau (SNL), Yassin A. Hassan (Texas A&M)
Proceedings | Advances in Thermal Hydraulics 2018 | Orlando, FL, November 11-15, 2018 | Pages 1003-1014
Applying solution verification methods to computational fluid dynamic (CFD) simulations has substantially increased within the past three decades, especially with the introduction of the grid convergence index (GCI) metric. Since then, numerical and meshing schemes and the governing equations have increased in complexity, which makes understanding the discretization error for a simulation even more complex. Greater understanding of how discretization error develops from local truncation error (LTE) within a simulation can provide additional evidence to determine the adequacy of the error model used in current solution verification methods. It also provides meshing strategies to improve the adequacy of the error model. When the error model is determined to be adequate, additional confidence is added to the solution verification studies. One way of understanding how discretization error develops from LTE is to quantify the LTE and track how it propagates through time and space using the partial differential equation. Propagating LTE through time and space was completed using two methods: difference of difference quotients (DDQ) method and method of manufactured solutions-informed modified equation analysis (MMS-informed MEA) method. These methods justify the adequacy of the error model implemented in most Richardson extrapolation (RE) methods for the implemented numerical and meshing scheme. In addition, an example problem is provided that showed the implementation of both discretization error estimation methods using a first-order method and a uniform, structured mesh. The discretization error estimation results were then compared to the exact discretization error.