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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 Winter Conference and Expo
November 17–21, 2024
Orlando, FL|Renaissance Orlando at SeaWorld
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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Latest News
New laws offer nuclear industry incentives for existing power plant uprates
This year, the U.S. nuclear industry received a much-needed economic boost that could help preserve operating nuclear power plants and incentivize upgrades that extend their lifespan and power output.
Signed into law in 2022, the Inflation Reduction Act offers production tax credits (PTCs) for existing nuclear power plants and either PTCs or investment tax credits (ITCs) for new carbon-free generation. These credits could make power uprates—increasing the maximum power level at which a commercial plant may operate—a much more appealing option for utilities.
Otohiko Aizawa, Hiroyuki Kadotani, Keiji Kanda, Yoshiaki Fujita
Nuclear Science and Engineering | Volume 50 | Number 1 | January 1973 | Pages 38-45
Technical Paper | doi.org/10.13182/NSE73-A22586
Articles are hosted by Taylor and Francis Online.
A new method of pulsed neutron experimentation is proposed and successfully applied to a beryllium metal system. The present technique utilizes the γ-ray flash from an electron linear accelerator. The employment of an “internal” neutron source, i.e., the (γ, n) reaction in beryllium, which is “softer” than the often used “external” 14-MeV neutrons from a generator, improves the state of the art of the die-away technique in beryllium. The reduction of background neutrons makes it possible to measure the decay curve until ∼ 1800 µsec after a burst even for a small beryllium assembly of 15 × 15 × 15 cm in dimension (B2 = 0.101 cm-2), while in earlier experiments the decay curves have been measured only until ∼600 µsec for such a small beryllium assembly. The present analysis of decay curves indicates that the assumption made by Kothari, who derived the limit of a discrete decay constant for crystalline moderators, is not valid at least for beryllium. On the other hand, Corngold’s limit is consistent with the experimental results.