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Limiting critical may con- potentially a water-reflected in Table basis, three III could isotopes The anser is concentration minimum critical as a a plant be considered Note that "no"! of the three. mass in an aqueous solution It and mass when in the form of the metal (reference Table VIII). 235 U concentrations are, however, smaller than those of 23gPu, by up to a factor diameter by geometry" of U or Pu that is diameter. by geometry" safe for which are of such the concentrations These "safe therein.

6% enriched for uranium, lattice the largest as a function 12. (21) the rod diameter uranium, appears for rods which of enrichment. For 3% enriched 1% the diameter be infinite. In the case of natural to be about 1 in. for zero buckling. diameter uranium, the to be about 4 in. zero bucklings the rod diameter would would appear Eā€™ . 35 4 08 . I E u _ i I. 6d V I 1 2 3 4 6 5 URANIUM ENRICHMENT,WI0lm Figure 12. Estimated Result Surface-to-Volume in Zero Bucklings Ratios (Infinite of Large Rods Which Critical MaSSeS) 36 Figure reviews 12 illustrates in operations mately 6% represents natural uranium criticality enough.

Are ex- a little bit 49 Oxygen itself irrespective can cause pronounced of density of k, measured for F , effects. 019 u"3 The dry U03 salt less is seen to have a value than the value the U03 system the oxygen. for uranium metal. is primarily of koa which is actually The smaller due to scattering koD value and moderation for by the fast neutron spectrum slightly, 235 which reduces the value of eta for the U, and fast fission in 238 238" U, and enhances resonance absorption in . 1 MeV. In the case of uranium metal, effect experience the only significant is due to inelastic moderating scattering.

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Anomalies of Nuclear Criticality by E. Clayton

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