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Division Spotlight
Reactor Physics
The division's objectives are to promote the advancement of knowledge and understanding of the fundamental physical phenomena characterizing nuclear reactors and other nuclear systems. The division encourages research and disseminates information through meetings and publications. Areas of technical interest include nuclear data, particle interactions and transport, reactor and nuclear systems analysis, methods, design, validation and operating experience and standards. The Wigner Award heads the awards program.
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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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Bipartisan nuclear waste bill introduced in U.S. House
U.S. representatives Mike Levin (D., Calif.) and August Pfluger (R., Texas) have introduced the bipartisan Nuclear Waste Administration Act of 2024, which would establish an independent agency to manage the country’s nuclear waste.
In addition to establishing a new, single-purpose administration to manage the back end of the nuclear fuel cycle, the bill would direct a consent-based siting process for nuclear waste facilities and ensure reliable funding for managing nuclear waste by providing access to the Nuclear Waste Fund. According to Pfluger and Levin, the bill’s provisions are in line with recommendations from the Blue Ribbon Commission on America’s Nuclear Future.
Jorma Jokiniemi, Kimmo Koistinen, Taisto Raunemaa
Nuclear Technology | Volume 90 | Number 3 | June 1990 | Pages 394-407
Technical Paper | RELAP/MOD2 / Nuclear Safety | doi.org/10.13182/NT90-A34403
Articles are hosted by Taylor and Francis Online.
Hygroscopic aerosols were studied at 40° C at different relative humidity levels in a flow-type reactor chamber. The main interest was in growth of hygroscopic aerosols under higher humidity conditions. The time development of the aerosol in the 0.01- to 17-µm size range was determined using electrical aerosol analyzer and optical particle counter aerosol analyses. Low velocity and laminar flow were used to facilitate the comparison with theoretical considerations. Cesium hydroxide (CsOH) and sodium hydroxide (NaOH) were used as hygroscopic materials. Cesium is one of the most abundant species in core melt release, and NaOH is well known for its hygroscopic properties. The primary particles were produced by a constant output atomizer. The dry particle size, as volume median diameter (VMD), for CsOH was 1.8 µm. The observed airborne particle size after 2 min of travel was 6.3 µm, after 5 min 5.3 µm, and after 10 min 3.4 µm at saturated conditions. For dry NaOH aerosol, the measured initial VMD was 2.7 µm. At saturated conditions, the observed VMD was 6.7 µm after a 10-min travel. Theoretical calculations with the modified NAUA code showed that during travel through the chamber, the particle size change can be attributed to hygroscopic growth and sedimentation.