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.
Explore membership for yourself or for your organization.
Conference Spotlight
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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
Sep 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
September 2025
Nuclear Technology
Fusion Science and Technology
October 2025
Latest News
Nano Nuclear wins Air Force contract for Kronos MMR
New York City–based advanced nuclear technology developer Nano Nuclear Energy has been awarded a Direct-to-Phase II Small Business Innovation Research contract for its Kronos micro modular reactor (MMR) by AFWERX, the innovation and venture arm of the U.S. Air Force. The contract calls for AFWERX, with the 11th Civil Engineering Squadron, to explore the feasibility of deploying the Kronos MMR Energy System at Joint Base Anacostia-Bolling (JBAB) in Washington, D.C.
V. Shepelin, D. Koshmanov, E. Chepelin
Nuclear Technology | Volume 178 | Number 1 | April 2012 | Pages 29-38
Technical Paper | Safety and Technology of Nuclear Hydrogen Production, Control, and Management / Hydrogen Safety and Recombiners | doi.org/10.13182/NT12-A13545
Articles are hosted by Taylor and Francis Online.
The structure of the catalyst used in a passive autocatalytic recombiner (PAR) is crucial for making the PAR reliably functional in environments of high humidity and for concentrations of hydrogen above 8 to 10 vol %. The temperature of the catalyst has to be kept below 500°C to avoid the autoignition of hydrogen. A new type of catalyst for the PAR, a hydrophobic catalyst on a low porous metal carrier with a screen [HCm(screen)], was designed by Russian Energy Technologies. It consists of a porous Ti plate with the adsorbtion metal Pt. The surface of the catalyst was completely covered by a metal grid. In a series of tests with different small-scale PARs, the HCm(screen) catalyst was found to function under concentrations of hydrogen up to at least 20 vol %. The effects of mass and heat transfer processes (Fick diffusion, Knudsen diffusion, and Stefan flow) on the thermal regime and characteristics of the working catalyst are discussed. Metal grids of dense weaving appear to be the most suitable for a screen because they have a double function: removing the heat and acting as a gas separation membrane enriching with hydrogen the gas mix in the zone of the catalytic reaction.