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
Apr 2024
Jan 2024
Latest Journal Issues
Nuclear Science and Engineering
May 2024
Nuclear Technology
Fusion Science and Technology
Latest News
WIPP improves utility shaft safety, begins infrastructure project
Harrison Western Shaft Sinkers (HWSS), the company drilling a new utility shaft at the Department of Energy’s Waste Isolation Pilot Plant in New Mexico, has retained a safety culture expert following a near-miss accident in the shaft late last year. The safety expert will conduct monthly facilitated discussions with crews working on the shaft to reinforce expectations for identifying concerns regarding unsafe circumstances, according to a recent report by the Defense Nuclear Facilities Safety Board (DNFSB).
Jie Zheng, Tong Guo, G. Ivan Maldonado
Nuclear Science and Engineering | Volume 137 | Number 2 | February 2001 | Pages 156-172
Technical Paper | doi.org/10.13182/NSE01-A2182
Articles are hosted by Taylor and Francis Online.
A linear superposition model (LSM) for the speedy and accurate estimation of lattice-physics parameters during within-bundle "pin-by-pin" loading optimization calculations of light water reactor nuclear fuel assemblies has been developed. The LSM has been implemented into the FORMOSA-L code, and typical results show that the run-time requirements can be reduced by at least an order of magnitude relative to performing direct lattice-physics evaluations with the CPM-2 or CASMO-3 code. Moreover, the speedups noted include all overhead expenses associated with the direct lattice-physics calculations required to construct the LSM sensitivity libraries. Additionally, accuracy improvements to the LSM are achieved by inclusion of higher-order cross terms and via quadratic interpolation when perturbing continuous variables. Also, it is shown that the errors generated by this first-order accurate technique can be kept well under control by treating material and spatial shuffles separately during optimizations. The results obtained indicate that the LSM can effectively substitute for direct lattice-physics evaluations throughout the entire optimization process without noticeable loss of fidelity. Finally, both synchronous and asynchronous implementations of parallel computing via the remote-procedure-call approach have been studied to further speed up the creation of LSM sensitivity libraries within FORMOSA-L.