Critical dimensions of systems containing /sup 235/U, /sup 239/Pu, and /sup 233/U: 1986 Revision Page: 51 of 205
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Subsequent exponential experiments at Hanford provided the further optimum critical
volumes for U(2.0) and U(3.063) that appear it Table 12.79 Savannah River personnel
extended the U(3) data to 5.1-cm- and 7.6-cum-diam ro(ls.' It is illuminating to plot
the U(3.063) critical volumes of Table 12 and corresponding critical masses against rod
diameter, as in Fig. 20. The iniiimum critical volume of 29.5 L occurs with a rod diameter
of about 1.1 cm. The critical mass miniumii is far below t he smallest rod diameter shown;
in fact, computations indicate that it should occur at a diameter of about 0.35 ci. The
corresponding v., dniie would be extremely large.
Oak Ridge reported critical lattices in water* of IT(4.95)**iiet al rods at a range of
diamieters 17,71 SphCrical critical masses were calculated from experiment al values of buck-
ling and corresponding et rapolation dist ance. A iniuilnnn spherical critical mass of 1.6
kg :"U at a rod diameter of about 0.17-cm compares with a mmiiinmin spherical critical
mass of 2.0 kg "' 'U for U(5.00) solution with water reflect or.
Experiments at Valduc established critical heights of water in lattices of U(4.75)O2 rods
at various pitches." Each rod contained 0.79-cm-diam by 90-cm-long UO2 at a density of
10.4 g/cm3 and was clad with 0.06-cm thick aluminum. Extrapolation to fully immersed
and reflected conditions led to a critical square lattice of 217 rods at an optimum pitch of
* Boron c oncenit ration of 0.140 g I increased critical masses about 25".
* Corrected by the author from U(4.89) reported in Hef. 78.
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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/m1/51/: accessed March 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.