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Of very- to as "cavity of the fissile of gases at less (28) atoms than atmospheric Thus the term "cavity reactor" has been used to describe with extremly low density interiors. I I I I I A I (From . R. 0015 I llllll I I lIllrrl 0. 01 I I I hrgl 01 . I I llrllll 10 . I II 10. 0 235U DENSITY, g/cm3 Figure 16. 5) or Beryllium for Metal Reflected by Thick a Wide Range of 235 U Densities 45 the critical mass of G. Safonov . calculates 235" cavity type reactors fueled with , 233U, or 23gPu that are externally moderated by D20, Be or C.

694%. (29) the critical unusual / about the (93 - l/Z%), but note the appearance 235 U densities between about for less than Q, 11%. the critical infinite on the left side of the Figure; 235 U densities (at large C/ 235U ratios). ment for 17 shows the unusual There is nothing calculations. enriched of critically mixtures. l mass will i. , for It is also become sufficiently small The minimum critical for which k, is unity Now it is clear that enrich- with no dilution) was whenever k, becomes unity mass becomes infinite.

7 and 11%. carbon can be explained as follows. As the neutron spectrum will be degraded 235 U will be reduced somewhat, as will slightly in energy. Eta for 238U 238 U; to the contrary, resonance capture in fast fission in will is added to the metal, and remain, spectrum 238 U will less be significantly excessive densities) reduces Thus, within three different critical than unity; but on further becomes sufficiently Ultimately, 3. Over a range of C/U ratios be somewhat enhanced. thermalized, reduced and kco will the enrichment ranges defined, C/235.

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