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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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Proposed rule for more flexible licensing under Part 53 is open for comment
The Nuclear Regulatory Commission has published a proposed rule that has been five years in the making: Risk-Informed, Technology-Inclusive Regulatory Framework for Advanced Reactors. The rule, which by law must take its final form before the end of 2027, would let the NRC and license applicants use technology-inclusive approaches and risk-informed, performance-based techniques to effectively license any nuclear technology. This is a departure from two licensing options with light water reactor–specific regulatory requirements that applicants can already choose.
Winfried Amian, Detlev Stöver
Nuclear Technology | Volume 59 | Number 2 | November 1982 | Pages 279-290
Technical Paper | Nuclear Fuel | doi.org/10.13182/NT82-A33031
Articles are hosted by Taylor and Francis Online.
A laser boring technique has been used to simulate failed coatings of fuel particles. The cesium fractional release from irradiated failed particles is measured in time intervals during an annealing treatment at 1000 and 1200°C, respectively. In addition, the distribution of cesium along kernel and coating is measured by destructive gamma spectrometry. The fractional release versus time data are quantitatively recalculated by superposing diffusion from kernel and buffer layer using a two-zone assembly in spherical geometry. The derived kernel diffusion constants agree reasonably well with corresponding data from in-pile measurements.