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
Conference on Nuclear Training and Education: A Biennial International Forum (CONTE 2025)
February 3–6, 2025
Amelia Island, FL|Omni Amelia Island Resort
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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February 2025
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Latest News
IEA report: Challenges need to be resolved to support global nuclear energy growth
The International Energy Agency published a new report this month outlining how continued innovation, government support, and new business models can unleash nuclear power expansion worldwide.
The Path to a New Era for Nuclear Energy report “reviews the status of nuclear energy around the world and explores risks related to policies, construction, and financing.”
Find the full report at IEA.org.
Jacques Rognon
Nuclear Science and Engineering | Volume 30 | Number 1 | October 1967 | Pages 109-121
Technical Paper | doi.org/10.13182/NSE67-A17248
Articles are hosted by Taylor and Francis Online.
In this paper fast-fission effects in lattices with cluster elements are treated by dividing the cluster into concentric annuli and homogenizing each ring by means of the subcell method. Each annular zone is analyzed separately, and the influence of neighboring zones is described by in- and out-currents at the zone boundaries. Consistency of cross sections is checked in the simple case of an isolated rod in air. Backscattering and cluster-cluster interaction effects are taken into account and an extensive comparison is made between theoretical and experimental fission ratios. Finally, a new definition of ε is proposed, which is more consistent with the definition of p and combines all fast events in ε . EPSICH, a program based on this theory, calculates a complete case in a few tenths of a second on a CDC-1604, which justifies its use for optimalization studies.
