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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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ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
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Candidates for leadership provide statements: ANS Board of Directors
With the annual ANS election right around the corner, American Nuclear Society members will be going to the polls to vote for a vice president/president-elect, treasurer, and members-at-large for the Board of Directors. In January, Nuclear News published statements from candidates for vice president/president-elect and treasurer. This month, we are featuring statements from each nominee for the Board of Directors.
B. J. Wrona, J. T. A. Roberts, T. M. Galvin, G. T. Higgins
Nuclear Technology | Volume 32 | Number 3 | March 1977 | Pages 276-289
Technical Paper | Fuel | doi.org/10.13182/NT77-A31751
Articles are hosted by Taylor and Francis Online.
A direct-electrical-heating apparatus was utilized to perform fundamental experiments on short, unirradiated, unclad UO2 pellet stacks to investigate the effect of varying the energy-deposition rate and energy level on the mechanical response of the fuel to transient heating. Results show that as the rate of energy input to the UO2 pellet stacks increases, (a) the energy failure threshold decreases and (b) the areal melt fraction at failure decreases. Two significantly different regimes of fuel-motion behavior were observed above and below a threshold designated as the threshold of gross fuel motion. Above the threshold, this motion occurs by molten fuel release. Below the threshold, fuel deforms plastically by a creep mechanism.
