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Fuel Cycle & Waste Management
Devoted to all aspects of the nuclear fuel cycle including waste management, worldwide. Division specific areas of interest and involvement include uranium conversion and enrichment; fuel fabrication, management (in-core and ex-core) and recycle; transportation; safeguards; high-level, low-level and mixed waste management and disposal; public policy and program management; decontamination and decommissioning environmental restoration; and excess weapons materials disposition.
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2024 ANS Annual Conference
June 16–19, 2024
Las Vegas, NV|Mandalay Bay Resort and Casino
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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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DOE awards $59.7 million for university nuclear R&D in 2024; $1 billion in 15 years
The Office of Nuclear Energy is awarding $59.7 million to 25 U.S. colleges and universities, two national laboratories, and one industry organization to support nuclear energy research and development and provide access to world-class research facilities, the Department of Energy announced on April 15.
Michael Epstein, Hans K. Fauske, Wison Luangdilok
Nuclear Technology | Volume 175 | Number 3 | September 2011 | Pages 520-528
Technical Paper | NURETH-13 Special / Thermal Hydraulics | doi.org/10.13182/NT11-A12503
Articles are hosted by Taylor and Francis Online.
It is well known that under certain circumstances a mixture of coarse, hot (molten) drops in water that forms from pouring a hot melt into water explodes. This so-called "steam explosion" is generally believed to involve fine fragmentation of the melt drops induced by steam bubble collapse and concomitant water vaporization on a timescale that is short compared with the steam pressure relief time. Motivated by a previously published idea that rapid solidification would render uranium oxide (UO2)-containing (corium) melt drops stiff and resistant to the fragmentation induced by steam bubble collapse that is requisite for an explosion, here we combine solidification theory with an available theory of the stability of thin, submerged crusts subject to acceleration to predict the "cutoff time" beyond which melt drop fragmentation is suppressed by crust cover rigidity. Illustrative calculations show that the cutoff time for corium melt drops in water is a fraction of a second and probably shorter than the time it takes to form the coarse-premixture configuration of melt drops in water that is a prerequisite for an explosion, while the opposite is true for the molten aluminum oxide (Al2O3)-water system for which the window of opportunity for an explosion is predicted to be several seconds. These theoretical findings are consistent with previous experiments that revealed molten UO2 or corium pours into water to be nonexplosive and produced steam explosions upon pouring molten Al2O3 into water.