Critical dimensions of systems containing /sup 235/U, /sup 239/Pu, and /sup 233/U: 1986 Revision Page: 48 of 205
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HETEROGENEOUS WATER-MODERATED URANIUM AT VARIOUS
NEAPR-HOMOGENEOt'S 1 DRO(,;N .\lOI)EIR ATED l'R ANIl'M ENRICHED IN 35U
Parallelepipeds and a pseudocylinder of C(93.16) metal foil (0.005- to 0.030-cm-thick)
interleaved with various combinations of 0.16-cn-thick Plexiglas plates and 0.46-cm- or
0.71-cm thick graphite plates were effectively homogeneous.'' An alhmiun matrix at
a nean density of 0.165 g. cm3 was distributed throughout the core and comprised the
reflect or. Crit ical condit ions appear ili Table 11. Volumes of equivalent spheres are quoted
in the reference.
WATER-\IODERATEH LATTICES OF gLICFHTLY ENRICHED UPIANIUM
Early me(wasurmciuents oii lattices of slightly enriched ura iumi metal or oxide rods in water
were sunmarized by Kouts et al. at t he Geneva (onfereuces of 1955 and 1957.716 Exper-
iluents with exponent ial coluniis est ablished values of buckling and extrapolation distance
for a number of lattice spacings at each rod diameter. For each diameter of U(1.027),
U(1.143), and t(1.299) metal rods, a spacing leading to the largest value of buckling, thus
smallest value of critical volume, was spanned. Such volumes for equilateral cylindrical lat-
tices are listed in Table 12. (Equilateral cylindrical geometry is chosen as more appropriate
for arrays of rods than spherical geometry.) There are less extensive data for lattices of
aluminum-clad U (1.3)02 rods.7I t'(3.95)02 rods clad with Inconel-" and U(4.02)02 rods
clad with stainless steel.''
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Paxton, H.C. & Pruvost, N.L. Critical dimensions of systems containing /sup 235/U, /sup 239/Pu, and /sup 233/U: 1986 Revision, report, July 1, 1987; New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc1109879/m1/48/: accessed March 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.