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Nuclear Criticality Safety
NCSD provides communication among nuclear criticality safety professionals through the development of standards, the evolution of training methods and materials, the presentation of technical data and procedures, and the creation of specialty publications. In these ways, the division furthers the exchange of technical information on nuclear criticality safety with the ultimate goal of promoting the safe handling of fissionable materials outside reactors.
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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
Nuclear Technology | Volume 83 | Number 1 | October 1988 | Pages 16-23
Technical Paper | Nuclear Safety | doi.org/10.13182/NT88-A34171
Articles are hosted by Taylor and Francis Online.
Fission products and other compounds released during severe nuclear power plant accidents will form aerosol particles, which include water-soluble compounds such as cesium hydroxide (CsOH), cesium carbonate, and cesium iodide. These hygroscopic particles will grow in a humid environment, and thus their settling rate is increased significantly at high relative humidities. This paper evaluates the hygroscopicity of CsOH and other water-soluble compounds released under severe accident conditions. The effect was incorporated into the kinetic particle growth model based on coupled mass and heat transport to evaluate the growth rates of single particles at different atmospheric conditions. Finally, the kinetic growth model for hygroscopic particles was included in the NAUA aerosol code to predict the general behavior of aerosols released into the containment atmosphere. A sensitivity analysis of this model was carried out to guide further work on important parameters and to decrease computing time. It is concluded that hygroscopic properties of radioactive cesium can, in favorable conditions, suppress the release of radioactive materials (source term) by orders of magnitude.