Description: A treatment is formulated for surface-to-surface radiative heat exchange between fuel pins and between pins and duct wall of a nuclear reactor subassembly voided of coolant. Specific attention is given to the case of equal power generation in each pin with uniform duct-wall temperature. Detailed temperature profiles and heat flux values are reported for hexagonal-ring subassemblies ranging in size from one to nine rings. It is found that a duct wall at 1153 degrees K can cool by radiation even a nine-ring voided subassembly operating at a power of up to 0.54 kW/ft per pin or 5.4% of full power without fuel slumping or melting, or that a seven-pin assembly can be cooled by radiation up to a power of 7.3 kw/ft.
Creator: Chan, S. H.; Condiff, D. W. & Grolmes, M. A.
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