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Conference Spotlight
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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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Hash Hashemian: Visionary leadership
As Dr. Hashem M. “Hash” Hashemian prepares to step into his term as President of the American Nuclear Society, he is clear that he wants to make the most of this unique moment.
A groundswell in public approval of nuclear is finding a home in growing governmental support that is backed by a tailwind of technological innovation. “Now is a good time to be in nuclear,” Hashemian said, as he explained the criticality of this moment and what he hoped to accomplish as president.
Workshop
Sunday, September 25, 2022|1:00–5:00PM PDT|Grand Pacific AB
ADVANTG is a software package that generates variance reduction parameters (space- and energy-dependent weight windows and biased source probabilities) that can substantially improve the convergence rate of fixed-source neutron and photon radiation transport simulations using MCNP. ADVANTG implements the Consistent Adjoint Driven Importance Sampling (CADIS) method to accelerate individual tallies and the Forward-Weighted CADIS (FW-CADIS) method to obtain nearly uniform statistical precision across multiple tallies and large mesh tallies. Additionally, ADVANTG 3.2.0 has the capability to produce variance reduction parameters based on the Multi Step CADIS (MS-CADIS) methodology for optimal calculations of delayed gamma radiation fields such as the shutdown dose rate (SDDR) in fusion facilities.
The workshop will discuss the theoretical background of the methods implemented in ADVANTG before moving on to a demonstration of the use of CADIS and FW-CADIS methods on test cases. The workshop will also include a tutorial on how to visualize the discretized geometry, source and discrete ordinates solutions using the open-source VisIt software (https://wci.llnl.gov/codes/visit/). Common issues when using variance reduction will be discussed alongside some best practices and suggestions for ADVANTG workflows.
ADVANTG has been used in a variety of radiation transport applications at ORNL as well as other organizations. Some recent advanced applications will be presented and discussed, including the use of ADVANTG for pressure vessel fluence predictions, neutron fluence and radiation heating in LWR concrete bioshields, and in the workflow for determining SDDR in the JET and ITER fusion facilities.
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