Investigation of bounds on particle packing in pebble-bed high temperature reactors |
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Authors: | Abderrafi M Ougouag Jan Leen Kloosterman Wilfred FG van Rooijen Hans D Gougar William K Terry |
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Affiliation: | aIdaho National Laboratory, P.O. Box 1625, Idaho Falls, ID 83415-3885, USA;bDelft University of Technology, Faculty of Applied Sciences, Physics of Nuclear Reactors, Mekelweg 15, 2629 JB Delft, The Netherlands |
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Abstract: | Models and methods are presented for determining practical limits of the packing density of TRISO particles in fuel pebbles for a pebble-bed reactor (PBR). These models are devised for designing and interpreting fuel testing experiments. Two processes for particle failure are accounted for: failure of touching particles at the pressing stage in the pebble manufacturing process and failure due to inner pressure buildup during irradiation. The second process gains importance with increasing fuel temperature, which limits the particle packing density and the corresponding fuel enrichment. Suggestions for improvements to the models are presented. |
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