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Division Spotlight
Thermal Hydraulics
The division provides a forum for focused technical dialogue on thermal hydraulic technology in the nuclear industry. Specifically, this will include heat transfer and fluid mechanics involved in the utilization of nuclear energy. It is intended to attract the highest quality of theoretical and experimental work to ANS, including research on basic phenomena and application to nuclear system design.
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!
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Nuclear Science and Engineering
May 2024
Nuclear Technology
Fusion Science and Technology
Latest News
Zap Energy hits 37-million-degree electron temperatures in compact fusion device
Zap Energy announced April 23 that it has reached 1-3 keV plasma electron temperatures—roughly the equivalent of 11 to 37 million degrees Celsius—using its sheared-flow-stabilized Z-pinch approach to fusion. Reaching temperatures above that of the sun’s core (which is 10 million degrees Celsius temperature) is just one hurdle required before any fusion confinement concept can realistically pursue net gain and fusion energy.
Jan Machacek, Laurent Cantrel, Peter Kluvanek, Marek Liska, Ondrej Gedeon
Nuclear Technology | Volume 163 | Number 2 | August 2008 | Pages 245-251
Technical Paper | Reactor Safety | doi.org/10.13182/NT08-A3984
Articles are hosted by Taylor and Francis Online.
Behavior of iodine fission product is of prime importance for short-term radiological consequences in a severe accident occurring on a pressurized water nuclear reactor. Iodine speciation in the reactor coolant system is commonly predicted with severe accident simulation software devoted to the transport and deposition of fission products and structural materials, for instance, the SOPHAEROS module of ASTEC. In these calculation tools, chemical equilibrium is assumed to be reached instantaneously whatever the conditions are. However, some thermodynamic data are still uncertain because of lack of experimental data. Quantum-chemical calculations can be appropriate tools to estimate equilibrium constants in a first step and maybe later to determine some kinetic constants for further implementation in such codes to better assess iodine chemical behavior. This paper is an attempt to calculate some equilibrium reactions for relevant reactions that are susceptible to impact iodine chemistry. The accuracy obtained for such calculations depends on the basis set used. Moreover, relativistic effect has to be taken into account for heavy atoms like iodine or cesium to get reliable predictions.