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
Accelerator Applications
The division was organized to promote the advancement of knowledge of the use of particle accelerator technologies for nuclear and other applications. It focuses on production of neutrons and other particles, utilization of these particles for scientific or industrial purposes, such as the production or destruction of radionuclides significant to energy, medicine, defense or other endeavors, as well as imaging and diagnostics.
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
May 2024
Jan 2024
Latest Journal Issues
Nuclear Science and Engineering
June 2024
Nuclear Technology
Fusion Science and Technology
Latest News
Steam is a sign of cooling system function . . . at ITER
Steam from one of ITER’s ten induced-draft cooling cells offers visual confirmation of a successful cooling system test, the ITER organization announced April 30. ITER’s cooling system features 60 kilometers of piping with pumps, filters, and heat exchangers that can pull water through at up to 14 cubic meters per second. Once fully operational, two cooling loops—one to remove the heat generated by the plasma in the ITER tokamak and one for its supporting infrastructure—will be capable of extracting up to 1,200 MW of heat.
Alexey Golubev, Yuri Balashov, Sergey Mavrin, Valentina Golubeva, Dan Galeriu
Fusion Science and Technology | Volume 67 | Number 2 | March 2015 | Pages 349-352
Proceedings of TRITIUM 2013 | doi.org/10.13182/FST14-T27
Articles are hosted by Taylor and Francis Online.
Washout coefficient Λ is widely used as a parameter in washout models. These models describes overall HTO washout with rain by the first-order kinetic equation, while washout coefficient Λ depends on the type of rain event and rain intensity and empirical parameters a, b. It was shown recently that variations of published data of washout coefficient are significant. Thus Λ = 10−4 sec−1 for the light rain event (∼ 1 mm-hour−1) while Λ = 10−3 sec−1 for heavy rain (∼ 25 mm-hour−1). Canadian standard recommends washout coefficient of 1.8-10−4 sec−1, German standard gives 3.5-10−5sec−1, while published Japan data varies from Λ = (7.3 ± 4.1)-10−5 sec−1 at 2 mm hour−1 to Λ = 4.6-10−4 sec−1 for the same rain intensity. This means that further investigations of HTO washout process are required. One of the issues is determining the useful relationship between macroscopic parameter of HTO washout Λ and microscopic HTO exchange rate of HTO molecules in atmosphere and in the raindrop water. Approaches to address this issue have been presented elsewhere. It can be shown that the empirical parameters a, b can be represented through the rain event characteristics using the relationships for molecular impact rate, rain intensity and specific rain water content while washout coefficient can be represented through the exchange rate K, rain intensity, raindrop diameter and terminal raindrop velocity.