EXPONENTIAL MEASUREMENTS ON 19-ROD CLUSTERS OF U02 RODS IN D20

摘要

Buckling measurements were made in the Savannah River Laboratory Exponential facilities on D20-moderated, 19-rod clusters of natural uranium oxide rods. Pour triangular lattice pitches from 7-00 to 12.12 inches and a single square pitch of 8.00 inches were used. Measurements were made at room temperature and at selected temperatures up to 2l8℃. Buckling changes resulting from voids inside housing tubes that surrounded the clusters were also measured. Intercomparisons of the results with critical void coefficient measurements demon¬strated the validity of calculations for the anisotropic diffusion effects of the voided lattices.